Investigating the Effect of Nickel Oxide on the Crystallisation, Optoelectronic Properties and Performance of 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
b Global Research Center for Environment and Energy based on Nanomaterials Science (GREEN), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.
Oral, Namrata Pant, presentation 049
DOI: https://doi.org/10.29363/nanoge.iperop.2020.049
Publication date: 14th October 2019

Nickel oxide (NiOx) has stood out as an excellent hole transporting material (HTM) for perovskite solar cell (PSCs). Its high optical transmittance, and matching valence band energy level, along with the high stability in ambient atmosphere, gives NiOx an edge over the other popularly used HTM’s for PSCs. Despite these advantages, the power conversion efficiency (PCE) values for NiOx HTM based devices lag significantly behind the high performing cells based on organic HTMs such as spiro-OMeTAD, and PTAA. Amongst the various factors, affecting the device performance, one of the major influence comes from the nature of substrate, which plays an influential role in governing the interfacial properties of the device as well as the bulk properties of the perovskite films. 

In the current study, we attempt to understand the possible reasons for low efficiency of sputtered NiOx based PSCs, by investigating how the NiOx under layer is directly affecting the growth and crystallisation of compositionally engineered perovskite film and study its correlation with the perovskite optoelectronic properties and device performance. In addition to varying perovskite composition, we also employed different deposition conditions to probe the relation between the crystal growth and charge carrier dynamics at the perovskite/NiOx interface. This work further emphasizes on the importance of specific deposition conditions and compositionally designed perovskite that are suitable for enhancing the efficiency of sputtered NiOx based perovskite solar cells. A deep insights into direct correlation of different deposition conditions, and growth mechanism of perovskite with device long term stability against ambient atmosphere (~50-60% humidity) and continuous light illumination will also be covered.

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