Determination of lifetime of double-layer CuPc/C60 organic solar cells by optical electric-field-induced second-harmonic generation measurement

Abstract

By using optical electric-field-induced second-harmonic generation measurement (EFISHG), we directly probed carrier transport processes in double-layer organic solar cells (OSCs). Results showed that excessive negative charges accumulated at the CuPc/C60 interface under photoillumination, and the accumulated charges decayed in a two-step process in dark. The EFISHG measurement is available for catching carrier process at the donor/acceptor interface of multi-layer OSCs to evaluate carrier lifetime of the cell. © 2010 Published by Elsevier B.V.