China's First Gallium Arsenide Single-Crystal Sample (October 1962)

In October 1962, Lin Lanying achieved another pioneering milestone by developing China's first gallium arsenide (GaAs) single-crystal sample. Gallium arsenide is a compound semiconductor material prized for its superior electron mobility and its critical role in high-frequency electronics, LEDs, and later, laser diodes and solar cells.

This achievement came at a time when China was racing to catch up with international semiconductor advances amid political isolation and limited access to foreign technology and materials. Lin's team had to develop growth techniques for this compound crystal largely through independent experimentation, building on the silicon and germanium crystal-growth expertise she had already established in the preceding years.

The successful production of a gallium arsenide single-crystal sample was a critical stepping stone toward more advanced compound semiconductor devices, including the semiconductor lasers Lin's team would fabricate just a year later in 1963. It demonstrated the depth and versatility of the crystal-growth program she led, extending China's capabilities beyond elemental semiconductors (silicon, germanium) into compound semiconductors, which would become vital for optoelectronics and high-speed communications technology.

This work reflects the broader significance of Lin's career: systematically building, material by material, the foundational science necessary for China's electronics industry, at a time when few women anywhere held such technically pivotal leadership roles in materials science.