【#Tech24H】A research team from Princeton University’s School of Engineering and Applied Science has developed an ultrathin semiconductor material that can be “programmed” through light. The material, only a few molecules thick, can reversibly change its electronic and optical properties under different wavelengths of light, enabling a programerasereprogram cycle. Unlike conventional semiconductors, whose properties are largely fixed after manufacturing, this new material can dynamically adjust its state in response to lighting conditions and can be programmed and erased multiple times. This modulation is not a simple onoff switch but rather allows continuous variation. By altering the light conditions, the material’s response can be gradually tuned and, when needed, reversed, giving it more flexible programmable characteristics. This achievement could facilitate the development of lowpower sensors, novel optoelectronic devices, and advanced computing technologies.[ By Zhang Liyan | Tang Ruohan ]