Dresden 2017 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 25: Fundamentals of Perovskite Photovoltaics IV (joint session CPP/DS/HL)
CPP 25.6: Talk
Tuesday, March 21, 2017, 15:30–15:45, ZEU 222
Carrier Recombination Analysis in Perovskites Using Time- Resolved Photoluminescence — •Liudmila Kudriashova1, Philipp Rieder1, Kristofer Tvingstedt1, Andreas Sperlich1, Georgy Astakhov1, Andreas Baumann2, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg
Despite the incredible progress of perovskite-based photovoltaics, many aspects of charge carrier recombination in organometal halide perovskites still remain unclear, inhibiting the targeted production of high-performance solar cells. Under solar cell operating conditions photoluminescence (PL) in perovskites is mainly caused by recombination of free photogenerated charge carriers. Hence the time-resolved photoluminescence (TRPL) is a powerful tool to reveal the complex charge carrier behaviour in perovskite films. Here, we implement the combination of several kinetic models for TRPL in CH3NH3PbI3 and CH3NH3PbI3−xClx films to extract the characteristic recombination rates and estimate the trap concentration. We obtain trap densities in the range of 1015−1016 cm−3 and show that PL decay drastically depends on interfaces between the perovskite and conducting layers. Currently controversial aspects, such as different recombination pathways, origin of trap states, and the effect of photon recycling, are discussed. In summary, TRPL analysis enables the calculation of trap density and clarifies the origin of defects, which is crucial for the further development of perovskite-based photovoltaics.