Influence of Nickel oxide underlayer on the crystallisation, optoelectronic properties and performance of perovskite solar cells
Namrata Pant a, Masatoshi Yanagida b, Yasuhiro Shirai a, Kenjiro Miyano a
a Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
b Photovoltaic Materials Group, Center for Green Research on Energy and Environmental Materials, National Institute for Materials Science (NIMS)
nanoGe Perovskite Conferences
Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Sevilla, Spain, 2020 February 23rd - 25th
Organizer: Hernán Míguez
Poster, Namrata Pant, 055
Publication date: 25th November 2019

Wide band gap nickel oxide (NiOx) has gained much popularity as a suitable inorganic hole transport layer (HTL) for inverse structured perovskite solar cells (PSCs). This can be attributed to its high optical transmittance and matching valence band energy level, along with the high stability in ambient atmosphere which gives NiOx an edge over the other commonly used HTL’s for PSCs. In spite of such advantages, performance of NiOx based perovskite device significantly lags behind that of the regular structured devices employing TiO2 and Spiro-OMeTAD as the charge transporting layers. The nature of the under layer and its interaction with perovskite film plays an important role in determining the performance, as it significantly governs the interfacial and bulk properties. Therefore, it is essentially important to understand the chemistry and physics at the perovskite/NiOx interface. The current work is focussed on understanding the possible reasons for low efficiency of sputtered NiOx based PSCs, by investigating the influence of sputtered NiOx under layer on the crystallization of perovskite and its correlation with the optoelectronic properties of the device. This talk will also discuss the role of different methods to deposit perovskite and the relation between the crystal growth and charge carrier dynamics of perovskite with different charge transport layer interfaces. Further, the importance of specific deposition conditions and composition of perovskite which are suitable for enhancing the efficiency of sputtered NiOx based perovskite solar cells will be discussed. Importantly, a deep insight 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 be presented.

This study was supported by the Special Doctoral Program for Green Energy Conversion Science and Technology, University of Yamanashi, Japan, through the “Program for Leading Graduate Students.”

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