Suppressing Nickel Oxide/Perovskite Interface Redox Reaction and Defects for Highly Performed and Stable Inverted Perovskite Solar Cells

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Sajjad Ahmad
  • Ruiman Ma
  • Jiawei Zheng
  • Qisen Zhou
  • Zhenwei Ren
  • Jinwook Kim
  • Xinjun He
  • Xiaoliang Zhang
  • Wallace C. H. Choy

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number2200787
Journal / PublicationSmall Methods
Volume6
Issue number10
Online published20 Sept 2022
Publication statusPublished - 20 Oct 2022

Abstract

The inorganic hole transport layer of nickel oxide (NiOx) has shown highly efficient, low-cost, and scalable in perovskite photovoltaics. However, redox reactions at the interface between NiOx and perovskites limit their commercialization. In this study, ABABr (4-(2-Aminoethyl) benzoic acid bromide) between the NiOx and different perovskite layers to address the issues has been introduced. How the ABABr interacts with NiOx and perovskites is experimentally and theoretically investigated. These results show that the ABABr molecule chemically reacts with the NiOx via electrostatic attraction on one side, whereas on the other side, it forms a strong hydrogen bond via the NH3+ group with perovskites layers, thus directly diminishing the redox reaction between the NiOx and perovskites layers and passivating the layer surfaces. Additionally, the ABABr interface modification leads to significant improvements in perovskite film morphology, crystallization, and band alignment. The perovskites solar cells (PSCs) based on an ABABr interface modification show power conversion efficiency (PCE) improvement by over 13% and maintain over 90% of its PCE after continuous operation at maximum power point for over 500 h. The work not only contributes to the development of novel interlayers for stable PSCs but also to the understanding of how to prevent interface redox reactions.

Research Area(s)

  • 4-(2-Aminoethyl) benzoic acid bromide, interface modifications, NiOx redox reaction, stability

Citation Format(s)

Suppressing Nickel Oxide/Perovskite Interface Redox Reaction and Defects for Highly Performed and Stable Inverted Perovskite Solar Cells. / Ahmad, Sajjad; Ma, Ruiman; Zheng, Jiawei et al.
In: Small Methods, Vol. 6, No. 10, 2200787, 20.10.2022.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review