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DS: Fachverband Dünne Schichten

DS 9: Organic Thin Films II

DS 9.2: Talk

Monday, March 7, 2016, 15:15–15:30, H11

Charge transport and trap dynamics investigations in organic solar cells via MIS structures — Nivedita Yumnam, Hippolyte Hirwa, and •Veit Wagner — Jacobs University, Campus Ring 1, 28759 Bremen, Germany

The charge transport in organic bulk heterojunction solar cells is a critical process affecting the performance of the solar cell. Investigating the charge transport dynamics in the solar cell allows determination of the relevant transport parameters. The mobility of the charge carriers can be determined in the short time regime (up to 1ms). While the longer time regime allows to study the density of trap states. For our characterization we have prepared metal insulator semiconductor (MIS) devices based on Si/SiOx substrate and bulk heterojunction semiconductor mixture of P3HT and PCBM. The mobility of charge carriers is determined by using MIS-CELIV (metal insulator semiconductor- charge carrier extraction by linearly increasing voltage) [1]. For the investigation of trap states in our device, we have employed our recently developed transient current measurement technique which does not need light illumination [2]. This illumination-free transient current (IFTC) technique offer insights on the capture time of the trapping states, their density of states and the attempt-to-escape frequency of trapped carriers. [1] A.Armin et al., Advanced Energy Materials, 2014, 4, 1300954.[2] H.Hirwa, V.Wagner, Organic electronics, Vol. 25, 2015, 112*120