Led solar door column lamp knowledge:

Why does a Group V compound semiconductor solar cell have high conversion efficiency, and GaAs will be described below as an example. This is because GAAS has a large light absorption coefficient and is strongly absorbed by light. Due to the indirect transition type semiconductor, the light absorption coefficient increases slowly with the increase of the photon energy. On the contrary, the absorption coefficient of the direct transition type GaAs will increase rapidly. Comparing the light absorption coefficients corresponding to the intrinsic absorption limits of both Si and GaAs, it can be seen that A is 100 cm 2 for Si, and 10 cm for B is GnAs, and the difference between them is 2 orders of magnitude.