Dresden 2017 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 42: Fundamentals of Perovskite Photovoltaics IV (joint session CPP/DS/HL)
HL 42.2: Talk
Tuesday, March 21, 2017, 14:30–14:45, ZEU 222
Identification of charge transport limiting factors in perovskite-based solar cells by Time-of-Flight measurements — •Irene Grill1,2, Meltem Aygüler1,2, Nadja Giesbrecht1,2, Pablo Docampo1,2, Thomas Bein1,2, Matthias Handloser3, and Achim Hartschuh1,2 — 1Department of Chemistry & CeNS, LMU Munich — 2Nanosystems Initiative Munich (NIM) — 3Toptica Photonics AG
Hybrid perovskites represent one of the most promising absorber materials for future photovoltaic applications due to the recently achieved high PCE values [1]. In this work, we determine the transport time of photoinduced charges in between the top- and bottom-electrode in perovskite thin film solar cells upon pulsed laser excitation, using Time-of-Flight (ToF) photocurrent measurements. To extract the influence of the individual layers on the transport characteristics and to identify limiting factors we carried out additional ToF studies on the respective absorber layer of the photovoltaic device in a lateral architecture. The results of the single film measurements are discussed in terms of crystal size and orientation. The direct comparison of the data obtained for the individual layers and the photocurrent transients of the final device under working conditions permits the identification of limiting factors for inter-facial and intra-film charge transport simultaneously to allow for the optimization of both the fabrication techniques [2,3] and device architecture. [1] M. Saliba et al., Energy Environ. Sci. 2016, 9, 1989. [2] I. Grill et al., Sol. Energ. Mat. Sol. Cells 2016, accepted. [3] A. Binek, I. Grill et al., Chem. Asian J. 2016, 11, 1199.