Differential photocurrent method for measurement of the optical-absorption coefficient and the minority-carrier diffusion length in a semiconductor
- 1 July 1980
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electron Devices
- Vol. 27 (7) , 1251-1255
- https://doi.org/10.1109/t-ed.1980.20016
Abstract
A new method, named DPC (differential-photocurrent), is proposed for measuring the optical-absorption coefficient and the minority-carrier diffusion length in a semiconductor. In the DPC method, a sample photodiode under a reverse bias, which is modulated at a frequency f2, is illuminated by an incident light chopped at a frequency f1, where f1and f2are close, and the DPC of the diode is measured. The method is free from limitations due to effects of surface recombination, surface reflectivity, and photon-transmission coefficient of surface layer. The optical-absorption coefficient for an n-typeKeywords
This publication has 0 references indexed in Scilit: