Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Publication date: 22nd May 2020
Measurements performed on methylammonium lead iodide (MAPI) showed that iodide vacancies and electron holes are the key players for, respectively, the observed bulk ionic and electronic conductivities in this material under dark.[1] However, interfacial behavior in perovskite thin films used for photovoltaics may largely deviate from the behavior of the bulk and is likely to greatly influence the response of perovskite solar cells. In this contribution, we present on the electrical response of MAPI based devices and address interfacial effects, including conductivity and defect redistribution at heterojunctions. We demonstrate that ionic interactions at the interfaces with TiO2 or Al2O3 determine the space charge behavior in MAPI.[https://arxiv.org/abs/1907.13618 ] Contrary to what would be concluded by analyzing these interfaces considering only electronic interactions, we show that a significant space charge potential is present within the hybrid perovskite phase. We finally discuss the implications of this finding for solar cell design.
The authors are grateful to K. Hahn, J. Deuschle, and C. Li (Stuttgart Center for Electron Microscopy, led by P. Aken) for performing the STEM, EDX measurements and FIB. The authors are also thankful to K. Müller (Interface Analysis group in MPI for Solid State Research, led by U. Starke) for XPS measurements. The authors are grateful to H. Hoier for XRD measurements, I. Moudrakovski for NMR measurement, A. Güth (Nanostructuring Lab in MPI for Solid State Research, led by J. Weis) for his help with electrode deposition and S. Hammoud for ICP measurement. The authors also wish to thank J. Popovic and F. Wu for helpful discussion.
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