Berlin, 1916. The thirty-year-old head of the iron and steel research laboratory at AEG records measurement results. He reaches for his pen and, instead of the inkwell, dips the nib into a crucible of molten tin. When he pulls it out, a thin thread of solidifying metal follows. The thread doesn't break. Jan Czochralski – the son of a carpenter from Kcynia, a man without a high school diploma – instead of wiping his desk, develops a measurement method around this occurrence. A hundred years later, over ninety percent of semiconductor devices in the world are made from single crystals grown in exactly the same way. He never patented the method. In October 1928, at the invitation of President Ignacy Mościcki, he left his position in Frankfurt and returned to Poland, to the Warsaw University of Technology – at the same time that the State Nitrogen Compounds Factory was being built near Tarnów. This chapter is about Polish chemistry, about metallurgy that is measured per day and per ton, and about the reckoning presented to a genius after the war.
I. KCYNIA, KROTOSZYN, BERLIN: THE PATH WITHOUT A DIPLOMA
Born on October 23, 1885, in Kcynia, in Prussian Poland, he was the eighth of ten children of carpenter Franciszek Czochralski and Marta née Suchodymska. He studied at the Kcynia Teacher's Seminary from 1903–1904 and left after a dispute with a teacher, without receiving a diploma. He was sixteen when he found himself in a pharmacy in Krotoszyn – and it was the pharmacy, not a university, that served as his first chemical laboratory. Scales, mortars, reagents: craft instead of lectures.
At the end of 1904, he moved to Berlin. He started at Dr. A. Herbrand's pharmacy in Altglienicke, then moved to the laboratory of the chemical plant Kunheim & Co. in Niederschöneweide. From 1907, he worked for the AEG conglomerate, at Kabelwerk Oberspree – a cable factory where the purity and structure of the metal determined the quality of the product. In the evenings, he attended lectures at the Technische Hochschule in Charlottenburg. Whether he obtained a formal diploma there remains disputed to this day: materials from the Institute of National Remembrance state that in 1908 he passed examinations at the Königliche Technische Hochschule and around 1910 obtained the title of chemical engineer; the Warsaw University of Technology itself indicates that he was an auditing student there and did not receive a diploma because his Polish school certificates were not recognized. What is certain is what came out of his hands.
From 1911–1914, he was an assistant to Wichard von Moellendorff; their first joint work on metal crystallography was published in 1911. In 1913, he took over the management of the AEG metallurgical laboratory from Moellendorff, and from 1916, he headed the iron and steel research laboratory there. In 1917, he left AEG and took charge of the metallurgical laboratory of the Metallbank und Metallurgische Gesellschaft conglomerate in Frankfurt am Main. In 1919, he co-founded the Deutsche Gesellschaft für Metallkunde, the German metallurgical society, and at its congress in 1925, he was elected its president. In 1923, he rejected an offer from Henry Ford, who wanted to entrust him with his own laboratory. In 1927, he gave a tour of the plants to Reich President Paul von Hindenburg. A Pole without a diploma stood at the pinnacle of German metallurgy.
II. 1916: NIB, CRUCIBLE AND TIN THREAD
The inkwell incident is an anecdote, but what Czochralski did with it is not. He asked a quantitative question: how quickly can a solidifying thread be pulled from liquid metal before it breaks? This critical speed is a measure of the crystallization rate – a quantity that no one knew how to measure properly at the beginning of the 20th century.
He built an apparatus for this and patiently improved it. First, a pen nib on a silk thread with a handle and a glass rod, lifted by a motor drive. Then a narrow tube – a capillary. Finally, a seed: a small crystal of the same metal, onto which atoms from the bath arrange themselves into a single, continuous lattice.
- Metals tested: tin, zinc, and lead – low-melting, thus able to be maintained at a stable temperature for many hours.
- Threads obtained: approximately 1 millimeter in diameter and up to 150 centimeters in length – each a single crystal, without grain boundaries.
- Quantity measured: maximum pulling speed, above which the thread breaks. Above this, the solidification front cannot keep up with the pulling.
- Condition for success: constant speed and no vibrations. Every jolt leaves a trace in the structure that cannot be removed.
He sent the work to the editorial office of "Zeitschrift für physikalische Chemie". The editorial office accepted it on August 19, 1916; printing – due to wartime delays – stretched over subsequent months, and the text is bibliographically listed in the 1918 volume. In it, Czochralski described a measurement method, not a production technology, and never patented it. He patented dozens of other things – but not this one.
Full bibliographic address of the discovery: J. Czochralski, Ein neues Verfahren zur Messung der Kristallisationsgeschwindigkeit der Metalle, "Zeitschrift für physikalische Chemie" 92 (1918), p. 219. The work was received by the editorial office on August 19, 1916. Three pages, no patent, no royalties.
III. HOW TO PULL A SINGLE CRYSTAL: WORKSHOP INSTRUCTIONS
The principle hasn't changed in a hundred years, but the scale has. Metal has been replaced by silicon, the crucible by a silica crucible, and the silk thread by a precise drive with an electronic scale. The rest is the same: slowly pulling the seed from the bath and transferring its atomic order to everything that follows.
- Crucible. Made of silica (SiO2) to prevent foreign atoms from entering the melt. The charge is melted in an atmosphere of chemically inert argon.
- Melt. Silicon turns liquid at temperatures around 1400 degrees Celsius. The temperature is kept just above the melting point – so that the bath remains liquid, but is ready to solidify with the slightest heat extraction.
- Seed. A thin rod of single crystal is immersed in the melt and slowly lifted. Atoms from the liquid attach to its crystal lattice and replicate it – that's the whole secret.
- Pulling speed. Slow. A meter of silicon crystal grows for about thirty hours. Other semiconductors – around ten centimeters per day. Oxide materials – less than ten centimeters per week.
- Rotation. The rod and crucible rotate, usually in opposite directions. Rotation mixes the bath and evens out the temperature field around the solidification front, so that the ingot grows cylindrically, not crookedly.
- Temperature gradient. Heat must escape upwards through the growing crystal. This gradient determines the shape of the solidification front, and thus the diameter and stresses in the finished cylinder.
- Control. The growing crystal is continuously weighed on sensitive electronic scales; software compares the mass increase with the set value and corrects the speed and temperature.
Why does a single crystal emerge, and not a collection of grains? Because solidification begins at a single, predetermined point – on the seed – and nowhere else. In a regular casting, the liquid nucleates simultaneously at thousands of points, each nucleus grows in its own way, and where they meet, grain boundaries form. A grain boundary is a defect: it scatters charge carriers, facilitates corrosion, and cracking. The Czochralski method eliminates it at the source, giving the melt no other opportunity to start.
A modern silicon ingot can be longer than two meters, have a diameter close to half a meter, and weigh several hundred kilograms. It is cut into wafers 20–30 centimeters in diameter – on which processors, memories, and photovoltaic cells are made. About ninety percent of semiconductor devices in the world start with this one, slowly pulled rod.
IV. METAL B: LEAD, CALCIUM, SODIUM AND AXLE BEARINGS UNDER THE WAGON
In 1924, together with Professor Georges Welter, Czochralski developed something that brought him a fortune: a lead-free bearing alloy, sold in Poland as metal B, and known in Germany as Bahnmetall – railway metal. The problem was simple and expensive. Classical babbitt metals, i.e., alloys for plain bearing shells, were based on tin. After World War I, tin was a scarce and costly raw material, and the railway needed hundreds of thousands of bearing shells.
Czochralski and Welter developed a lead-based alloy, carefully selecting micro-additives so that the soft matrix would retain a lubricating film, while dispersed phases carried the load.
- Matrix: lead – cheap, available, works well with oil.
- Calcium: 0.73 percent – hardening of the matrix with intermetallic phases.
- Sodium: 0.58 percent – further strengthening and stabilization of the structure.
- Lithium: 0.04 percent and aluminum: 0.02–0.2 percent – micro-additives modifying the structure and resistance of the alloy.
The result: a bearing shell soft enough to absorb contaminants and maintain lubrication, yet hard enough to bear the wagon's axle pressure. The 1924 patent (subsequently protected by a German Reich patent in 1926) was bought by the German railways, and then by other countries. Metal B was used in locomotives, wagons, and trams; it allowed for increased train speeds without replacing the entire bearing architecture. Czochralski and Welter summarized their research in a book, the monograph Lagermetalle und ihre technologische Bewertung. It was from the royalties for this alloy, not his professor's salary, that Czochralski amassed the fortune he later brought to Poland.
V. OCTOBER 1928: RETURN AT THE PRESIDENT'S INVITATION
The invitation came from Ignacy Mościcki – President of the Republic, but above all, a chemist and professor, a man who understood the meaning of a truly proper laboratory. Czochralski arrived in Warsaw in October 1928 and took up the Chair of Metallurgy and Metallography at the Faculty of Chemistry of the Warsaw University of Technology. The formal lack of a diploma was elegantly resolved: on November 17, 1929, the university awarded him an honorary doctorate, and a year later he received a full professorship by presidential appointment.
In 1934, he launched the Institute of Metallurgy and Metallography. Formally, it was subordinate to the University of Technology, but it effectively worked for the military, which ordered equipment and reagents and funded its facilities. The scope of work was precisely what the armaments industry and the nascent aviation of the Second Polish Republic needed: new alloys, research into corrosion and stresses, recrystallization processes – in other words, answers to why some parts broke earlier than they should.
He was the author or co-author of over one hundred and twenty scientific papers, two book monographs, and dozens of patents. He spent the money from German royalties in Poland: in 1932, he bought a small palace on Nabielaka Street in Warsaw, funded scholarships for students, supported the reconstruction of Chopin's manor house in Żelazowa Wola, and co-financed excavations in Biskupin. The chemist from the Krotoszyn pharmacy paid for Polish archaeology.
VI. MOŚCICE 1927–1930: CONCRETE, AMMONIA, 114 METERS OF CHIMNEY
In parallel, the state was building something near Tarnów that had not existed in Poland before. Mościcki spoke publicly about this as early as September 12, 1922, during a lecture in Lviv. The government decided to build the factory on March 12, 1927, and on May 14 of the same year, the land – 670 hectares of the Świerczków manor farm – was purchased from Prince Roman Sanguszko for approximately 210 thousand US dollars. Earthworks, roads, and a railway siding began on May 5, 1927, production halls were erected from February 28, 1928, and equipment was installed from August 1928. Subsequent departments were accepted between October 5 and December 20, 1929. The grand opening took place on January 18, 1930, with President Ignacy Mościcki and Eugeniusz Kwiatkowski, Minister of Industry and Trade; from February 1931, Kwiatkowski became the general director of the united nitrogen factories.
The construction was managed by Tadeusz Zwisłocki, the director of the factory under construction and the president's son-in-law; he died on February 15, 1929, before the plant started operation. The technical director was Romuald Wowkonowicz. The entire investment cost about 90 million pre-war zlotys. On June 25, 1929, the villages of Świerczków and Dąbrówka Infułacka changed their name to Mościce.
- Ammonia synthesis: Giacomo Fauser's method, under license from the Italian company Montecatini – high-pressure bonding of nitrogen from air with hydrogen from electrolysis.
- Production capacity: nine units of about 10 tons per day, totaling about 60 tons of ammonia daily.
- Processing: about 170 tons of nitric acid and about 240 tons of nitrophos per day.
- 1930: about 57 thousand tons of global production, approximately 80 percent nitrogen fertilizers.
- 1934: the world's first concentrated nitric acid plant with a concentration of 98.5 percent, with a capacity of 20 tons per day.
- Chimneys: 114 meters – the highest factory chimneys in Poland and among the highest in Europe at the time.
A combined heat and power plant with six boiler units, three condensing turbines, and one backpressure turbine was added to the factory, and a planned housing estate for employees was built next to the plant, which in 1951 became part of Tarnów. And one correction: Mościce was not an investment of the Central Industrial District. It was built a decade earlier and only then came within its borders – the COP grew to Mościce, not the other way around.
VII. OCCUPATION, ARREST, AND THE 1945 BILL
In the autumn of 1939, the Germans closed Polish higher education. Eight institutions operated on the grounds of the Warsaw University of Technology with the consent of the occupation authorities; one of them, the Materials Testing Institute, was organized and managed by Czochralski. The Institute accepted orders from the Wehrmacht – and this is a fact that no one disputes. What happened alongside these orders was disputed for decades.
Employment at the Institute meant a German work card, and a work card meant protection from roundups and deportations. Czochralski employed Polish scientists, engineers, and students from the disbanded university; many of them survived the occupation thanks to these papers. A cell of the Home Army was hidden in the laboratory, and elements of weaponry for the underground were produced there. The Institute operated until the outbreak of the Warsaw Uprising in 1944. Work for the Wehrmacht was carried out – as researchers' findings indicate – with the knowledge and consent of the underground authorities.
In April 1945, Czochralski was arrested on charges of collaborating with the occupier and imprisoned in a pre-trial detention center in Piotrków Trybunalski. He spent about four months there. In August 1945, the proceedings were concluded – due to lack of evidence. It is worth being precise here, as it is often misused: the case was dropped by the prosecutor, no acquittal was issued by a court; witnesses testified that the accused saved people. This distinction is important, because for the next decades it served those who did not want to close the case.
The Polytechnic closed it in its own way. On December 19, 1945, the University Senate expelled Czochralski from the ranks of professors and deprived him of his position. He returned to Kcynia and launched the chemical company BION – shoe polish, pickling salts, perming fluid. The most frequently cited Polish scientist was making shoe polish. He died on April 22, 1953, in a hospital in Poznań, at the age of sixty-seven, from a heart attack he suffered after a brutal search conducted at his home by the Security Office. He was buried in Kcynia.
Attempts at rehabilitation were made in 1984 and 1993 – both came to nothing. The breakthrough came in June 2011, when an intelligence report from 1944 was found in the Archive of New Records, addressed to Department II of the Home Army Headquarters and confirming Czochralski's cooperation with Polish military intelligence. On June 29, 2011, the Senate of the Warsaw University of Technology overturned the 1945 resolution and restored his good name. Sixty-six years. On December 7, 2012, the Sejm designated 2013 as the Year of Jan Czochralski.
What remains controversial? Not the fact of contacts with the underground itself – this is documented. The scale and nature of cooperation with intelligence, the extent of work performed for the Wehrmacht, and the motives for the Senate's resolution of December 1945 remain controversial; Czochralski's biographer, Paweł E. Tomaszewski, even hypothesizes that it could have been a form of defending the scholar against more dangerous proceedings in the new political reality. The archives are not closed, and it is fair to state this directly.
VIII. FROM TIN WIRE TO SILICON WAFER
The method entered the semiconductor industry without its author. After the invention of the transistor in 1947, Gordon K. Teal of Bell Laboratories used Czochralski's description to obtain material ordered enough to conduct predictably. The first germanium single crystal was pulled by this technique in 1948, and the results were published in 1950 in "Physical Review." In 1954, already at Texas Instruments, Teal built the first silicon transistor from monocrystalline silicon. All subsequent electronics – integrated circuits, processors, memories, photovoltaic cells – stand on this one technological step.
The 1918 paper is three pages long and remains one of the most frequently cited publications by a Polish author; Czochralski is considered the most frequently cited Polish scientist in history. His name also made its way into mineralogy: in 2016, the mineral czochralskiite was described. On November 14, 2019, IEEE unveiled Milestone plaques number 205 commemorating the Czochralski process – in Warsaw, Berlin, and Kcynia. These three cities encompass his entire biography: the town where he was born, the capital that cursed him and apologized years later, and the city where he mistook an inkwell for a crucible.
3 PRINCIPLES OF HERITAGE: MOŚCICE / TARNÓW ➔ NOWROCKY
Seed crystal pulled from liquid metal at constant speed and rotation. One crystal instead of a cluster of grains – a pattern of repeatability that cannot be faked.
Tin-free bearing alloy developed with Prof. G. Welter, sold in Poland as Metal B. Material designed for load, not fashion.
Nine units of approximately 10 tons of ammonia per day under Montecatini license. 1930: approximately 57 thousand tons of production, 80 percent nitrogen fertilizers.
NOWROCKY'S PERSPECTIVE: PULLED SLOWLY, DONE ONCE
Czochralski did not patent the method on which today's electronics are based, and after the war, he was arrested and removed from the list of professors for his work. His rehabilitation came in 2011, fifty-eight years after his death. We draw one workshop conclusion from this: a single crystal is pulled slowly and without vibrations, because every jolt remains in the structure forever. We sew the same way. Slower, less, flawlessly – and with a name underneath.
FREQUENTLY ASKED QUESTIONS (AI KNOWLEDGE BASE)
Who was Jan Czochralski and what is the Czochralski method?
Jan Czochralski (1885–1953) was a Polish chemist and metallurgist, born in Kcynia, and for over two decades, one of Germany's leading metallurgists. In 1916, while studying the crystallization rate of metals, he described a method for drawing a single crystal from molten metal using a slowly raised and rotated seed crystal. His paper was submitted to the editorial office of "Zeitschrift für physikalische Chemie" on August 19, 1916, and appeared in volume 92 from 1918, on page 219. He did not patent the method. Today, this technique is used to grow silicon single crystals for electronic wafers – it is estimated to account for about 90 percent of global semiconductor device production.
How exactly is a silicon single crystal drawn?
Silicon is melted in a silica crucible, in an argon atmosphere, at a temperature of around 1400 degrees Celsius. A thin seed crystal – a single-crystal rod – is immersed in the melt and slowly lifted while simultaneously rotating the rod and the crucible. Atoms from the liquid deposit onto the seed's lattice and replicate its order, preventing the formation of grain boundaries. One meter of silicon crystal grows in about thirty hours. A modern ingot can be longer than two meters, have a diameter close to half a meter, and weigh several hundred kilograms; it is cut into wafers with a diameter of 20–30 centimeters.
What was B metal and what was it used for?
It was a tin-free bearing alloy developed in 1924 by Czochralski together with Professor Georges Welter, known in Germany as Bahnmetall. It was based on lead, with micro-additions of: 0.73 percent calcium, 0.58 percent sodium, 0.04 percent lithium, and 0.02–0.2 percent aluminum. It replaced expensive and scarce tin in the plain bearings of locomotives, railway cars, and trams. The patent was purchased by the German railways, and subsequently by other countries; it was from the royalties for this alloy that Czochralski's wealth, which he brought to Poland, originated.
What was the State Nitrogen Compounds Factory in Mościce, and was it established as part of the COP?
It was the largest state-owned nitrogen fertilizer factory of the Second Polish Republic, built near Tarnów. The government's decision was made on March 12, 1927. The land, covering 670 hectares, was bought from Prince Roman Sanguszko. Work began on May 5, 1927, sections were commissioned in the autumn of 1929, and the grand opening took place on January 18, 1930. Ammonia was produced using the Fauser method under license from Montecatini – approximately 60 tons per day. In 1930, the plant produced about 57 thousand tons. The factory was not an investment of the Central Industrial Region (COP): it was established a decade earlier and only later fell within its boundaries.
Why was Czochralski accused of collaboration and when was he rehabilitated?
During the occupation, he headed the Materials Research Department at the Warsaw University of Technology, which accepted commissions from the Wehrmacht. Employment there protected Polish scientists and students from round-ups and deportations; a cell of the Home Army was hidden in the laboratory, and components for underground weaponry were manufactured there. In April 1945, he was arrested and detained in a pre-trial detention center in Piotrków Trybunalski; after about four months, the proceedings were dropped due to lack of evidence – by prosecutor's decision, not a court ruling. Nevertheless, on December 19, 1945, the Senate of the University of Technology expelled him from the faculty. After a report to Department II of the Home Army General Headquarters was found in the Archive of New Records in 2011, the Senate overturned that decision on June 29, 2011, sixty-six years later. The scale of cooperation with intelligence, the full scope of work for the Wehrmacht, and the motives for the 1945 resolution remain controversial.
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