论文部分内容阅读
1.光电二极管工作原理和特性光电二极管是结型器件。当光照射在P-N结时,光子被吸收,产生电子-空穴对,电子和空穴在结区被结电场所收集,在外电路形成光电流。为了保证绝大部分响应波长的入射光能在结区吸收,这就要求空间电荷区有足够宽度,所以外电路加有足够的反偏电压。反偏电压V_b变化时,光电流I_1和入射光功率P_1的关系如图1。在低偏压下灵敏度S=
1. Photodiode Operating Principle and Characteristics Photodiodes are junction devices. When light strikes the P-N junction, the photons are absorbed and create electron-hole pairs. Electrons and holes are collected in the junction area by the junction electric field and form photocurrents in the external circuit. In order to ensure that most of the incident wavelength of the incident light energy absorption in the junction area, which requires space charge area has enough width, so the external circuit plus a sufficient reverse bias voltage. When the reverse bias voltage V_b changes, the relationship between the photocurrent I_1 and the incident light power P_1 is shown in FIG. 1. Sensitivity at low bias S =