Berlin 2018 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 18: Perovskite and Hybrid Photovolatics

HL 18.12: Vortrag

Dienstag, 13. März 2018, 12:30–12:45, EW 203

Effect of Varying the Density of Defects on the Properties of Organometal Halide Perovskites — •Paul Fassl¹, Vincent Lami¹, Alexandra Bausch¹, Zhiping Wang², Henry Snaith², and Yana Vaynzof¹ — ¹Kirchhoff-Institute for Physics, Heidelberg University — ²Department of Physics, University of Oxford, UK

Organometallic halide perovskite solar cells have become a promising class of material with certified efficiencies up to 22.7 % to date. [1] However, reports investigating the fundamental mechanisms limiting the material and device stability remain scarce.

In our recent work we investigated the role of microstructure on the degradation rate of methylammonium lead triiodide (MAPbI3) perovskite films upon exposure to light and oxygen, however the role of the density of defects remains unknown. [2] In this work we therefore vary the density of defects in the films while keeping the microstructure unchanged. We characterize the perovskite films using photoemission spectroscopy, x-ray diffraction, photoluminescence and photothermal deflection spectroscopy and correlate the findings to the photovoltaic parameters and stability of complete devices.

[1] Research Cell Efficiency Records: https://www.nrel.gov/pv/assets/images/efficiency-chart.png (accessed: December 2017)

[2] Q. Sun, P. Fassl, D. Becker-Koch, A. Bausch, B. Rivkin, S. Bai, P. E. Hopkinson, H. J. Snaith, Y. Vaynzof, Adv. Energy Mater. 2017, 7, 1700977.