Lin Lanying

Lin Lanying a twentieth-century Chinese physicist and materials scientist (1918-2003) known as the mother of semiconductor materials research in her country. She led the team that produced the first single crystals of germanium and silicon grown in China, and her work laid the foundation for the Chinese semiconductor and electronics industries.

Early Life and Education

Lin Lanying was born in 1918 in Fujian province, the daughter of a family that valued learning and encouraged her unusual determination to pursue a scientific career. She studied physics at a leading Chinese university at a time when very few women entered the physical sciences, and she graduated with distinction. Her teachers recognised a rare combination of theoretical insight and practical skill at the bench.

She went to the United States for graduate work, where she studied solid-state physics and the growing science of semiconductors at a period when the transistor had just been invented and the field was opening rapidly. She earned her doctorate and remained for a time in American laboratories, gaining experience in the growth and characterisation of crystals that would prove decisive for her later work.

Like a number of Chinese scientists of her generation she chose to return home, despite the better conditions available abroad, in order to help build the scientific base of the newly founded People's Republic. She arrived to find laboratories poorly equipped and the most basic materials unavailable, so that every step required improvisation and self-reliance.

The Growth of Semiconductor Crystals

The central achievement of Lin's career was the growth of the single crystals on which all semiconductor devices depend. A transistor or an integrated circuit must be fabricated from a crystal of extreme purity, in which the atoms are arranged in a single continuous lattice, and the techniques for producing such crystals were then closely guarded secrets held by a few foreign laboratories.

With a small team and improvised equipment she succeeded in growing the first single crystals of germanium produced in China, and shortly afterwards the first crystals of silicon. These achievements, which had to be reached without access to the published details of the foreign processes, established the material foundation on which the Chinese semiconductor programme could be built. The crystals were of a quality sufficient for the fabrication of working devices.

She also worked on the related materials of the compound semiconductors, such as gallium arsenide, which promised higher speeds and new applications. Throughout this work she insisted on the integration of crystal growth with the measurement of the electrical and structural properties of the material, so that the process could be understood rather than merely reproduced. This emphasis on characterisation distinguished her laboratory.

Semiconductor Devices and Applications

Lin's laboratory did not rest with the production of crystals but went on to fabricate devices from them, including diodes, transistors and later the elements of integrated circuits. She understood that a material is only of value when it can be made into a working component, and she organised her group to span the whole chain from raw material to finished device, an unusual breadth at the time.

Her team produced some of the earliest Chinese transistors and other semiconductor components, which found use in the electronics that the country was beginning to manufacture. These devices supported the development of radio, computing and instrumentation, and they demonstrated that China could master a technology of the highest sophistication through its own efforts.

She also concerned herself with the industrial application of semiconductor research and with the training of the engineers who would operate the new factories. She argued that scientific institutes and production enterprises must work closely together, so that the results of research would pass quickly into useful products rather than remaining confined to the laboratory.

Women in Science and Public Life

As one of the most eminent women scientists in China, Lin became a symbol of the possibilities open to women in the exact sciences. She took seriously the responsibility that this placed upon her, mentoring younger women and speaking about the obstacles they faced, and she served in national bodies concerned with science and with the status of women.

She held senior positions in the Chinese Academy of Sciences and in national committees on electronics and materials, where she helped to set the direction of research policy. Her combination of technical authority and public standing made her an influential figure in the debates over how a developing country should organise its scientific effort.

She was known for a direct and demanding style, expecting from her colleagues the same persistence and rigour that she brought to her own work. Her personal life was austere, and she devoted herself almost wholly to research and to the building of the institutions that would outlast her.

Influence and Legacy

The semiconductor materials programme that Lin founded grew into a substantial part of the Chinese research system, and the crystals and devices produced by her group supplied the seed for a wider electronics industry. The techniques she introduced, and the culture of self-reliance she embodied, were carried forward by the many students and colleagues she trained.

Her reputation rests on the fact that she achieved results of international standard under conditions of scarcity, isolating her laboratory from the most advanced centres by political circumstance. Her work showed that a determined research group could reach the frontier of a demanding technology through careful experiment and unremitting effort.

She died in 2003, honoured as a founder of Chinese materials science and as a pioneer for women in science. The growth of the first Chinese semiconductor crystal remains her most famous achievement, a single technical step on which an entire industry was later built. She is remembered as a scientist of exceptional discipline and as a figure of national significance in the modernisation of her country.

See also

• Semiconductor
• Single crystal growth
• Silicon
• Chinese Academy of Sciences