Importance of Surface Treatment to Enhance the Efficiency of Undoped sp-NiOx Based Perovskite Solar Cells
Namrata Pant a, Masatoshi Yanagida b, Yasuhiro Shirai b, Kenjiro Miyano b
a Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
b National Institute for Materials Science (NIMS), Center for Green Research on Energy and Environmental Materials, Photovoltaic Materials Group, Japan, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP20)
Tsukuba-shi, Japan, 2020 January 20th - 22nd
Organizers: Michio Kondo and Takurou Murakami
Poster, Namrata Pant, 102
Publication date: 14th October 2019

Nickel oxide (NiO) has been recognized as one of the most promising inorganic hole transporting layer (HTL) for inverted structure perovskite solar cells, not only due to its robust nature and high conductivity, but also due to its potential application in the fabrication of tandem solar cell devices. However, the relative low efficiency as compared to regular structured spiro-OMeTAD based devices, is a bit discouraging, and active research has been going on to understand the cause for low device efficiency. In this study, we focus on understanding the relation between the sputtered (sp) NiOx surface and its effect on the structural, morphological and photo physical properties of perovskite layer. Further, X-ray photoelectron spectroscopy (XPS) results reveal an important correlation between the influence of surface treatment on the active nickel species present on the surface of NiOx and the photovoltaic device parameters. The present work highlights the importance of surface treatment of NiOx for efficient perovskite solar cells. A detailed investigation on the compatibility of perovskite with the underlying sp-NiOx to improve the performance of inverse structured devices will be presented.

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