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Research Article

Efficient carrier transport via dual-function interfacial engineering using cesium iodide for high-performance perovskite solar cells based on NiOX hole transporting materials

Taotao Hu, Fu Zhang, Hua Yu( ), Meng Zhang, Yue Yu, Wenfeng Zhang( ), Rui Liu, Liuwen Tian, Zhu Ma
Institute of Photovoltaics Southwest Petroleum University Chengdu 610500 China
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Abstract

As a famous hole transporting material, nickle oxide (NiOX) has drawn enormous attention due to its low cost and superior stability. However, the relatively low conductivity and high-density surface trap states of NiOX severely limit device performance in solar cell applications. Interfacial engineering is an efficient approach to achieve remarkable hole-transporting performance by surface passivation. Herein, the efficient NiOX hole transport layer was prepared by surface passivation engineering strategy via facile solution processes with cesium iodide (CsI). It is demonstrated that CsI plays a super-effective dual-function role in inverted solar cell device: On one hand, the presence of CsI hugely passivates the surface trap states at the NiOX/perovskite interface along with obviously improved conductivity by the incorporated Cs+; on the other hand, the ions immigration is significantly suppressed by the presence of I ion for high-quality perovskite films, resulting in a stable contact interface. The ameliorative interface leads to largely reduced carrier non-radiative recombination, attributing to boosted carrier extraction efficiency. As a result, decent power conversion efficiency (PCE) of 18.48% with a noticeable fill factor (FF) beyond 80% was achieved. This facile and efficient surface engineering approach with dual-function shows excellent potential for the design of high-performance functional interfacial modification layer to achieve high-performance solar cells.

Keywords

perovskite solar cells (PSCs)NiOXsurface passivation engineeringcesium iodidehigh fill factor

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Nano Research
Volume 14 Issue 11,
November 2021
Pages 3864-3872
DOI: 10.1007/s12274-021-3306-2
Cite this article:
Hu T, Zhang F, Yu H, et al. Efficient carrier transport via dual-function interfacial engineering using cesium iodide for high-performance perovskite solar cells based on NiOX hole transporting materials. Nano Research, 2021, 14(11): 3864-3872. https://doi.org/10.1007/s12274-021-3306-2
Topics:
Polymer solar cells

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Received: 28 September 2020
Revised: 24 December 2020
Accepted: 25 December 2020
Published: 05 June 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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