Demonstration of space-charge-limited time of flight as a new tool for characterization of real a-Si:H solar cells

Abstract

First we discuss the problems of the SCL-TOF transients measured on real solar cells in a current mode. By comparison with an independent method of finding of the density of states (DOS) we show that the charge Q cc, collected in the Space-Charge-Limited (SCL) - Time of Flight (TOF) method is clearly related to the DOS. We demonstrate that the problems of current mode are excluded in the integral mode SCL-TOF, for which we present the simple theory, within the framework of which we discuss the new experimental results.