Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 29: Hybrid and Perovskite Photovoltaics II (Joint session of CPP, DS and HL, organized by CPP)

HL 29.4: Vortrag

Dienstag, 8. März 2016, 11:30–11:45, H37

Analysis of electronic trap states in methylammonium lead halide perovskite solar cells via thermally stimulated current — •Philipp Rieder¹, Andreas Baumann^1,2, Stefan Väth¹, Kristofer Tvingstedt¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Bavarian Center for Applied Energy Research ZAE, 97074 Würzburg

Organolead halide perovskite solar cells have emerged as one of the most promising technologies in thin-film photovoltaics due to their extraordinary increase in performance in only six years. Yet, the working principles of this material class still lack fundamental understanding. To address the possible influence of electronic traps on device performance, we probed solution processed methylammonium lead halide perovskite solar cells via thermally stimulated current (TSC) analysis.[1] Thereby, the sample is heated from 10 K to 300 K, while monitoring the current flow. This current is attributed to charge carriers being released from previously filled trap states in the semiconductor, allowing drawing conclusions about their distribution and energetic depth. Signals detected at low as well as at high temperatures can be attributed to shallow and deep traps, accordingly. Furthermore, a peak at around T=162 K can be assigned to the reported structural phase transition of the perovskite crystal from orthorhombic to tetragonal crystal lattice structure.

[1] A. Baumann et al., J. Phys. Chem. Lett. 6, 2350 (2015)