Surface treatment of nickel oxide hole transport layer for highly efficient p-i-n perovskite solar cells
Seon-Min Lee a, Hyun-Jung Lee a, Sung-Nam Kwon a, Seok-In Na a
a Jeonbuk National University, South Korea, Jeonju, Korea, Republic of
International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
London, United Kingdom, 2023 June 12th - 14th
Organizers: Tracey Clarke, James Durrant and Trystan Watson
Poster, Seon-Min Lee, 266
Publication date: 30th March 2023

Positive-intrinsic-negative (p-i-n) perovskite solar cell (PeSC) is getting attention due to its high application potential such as tandem. Nickel oxide (NiOx) with wide bandgap and deep valence band maximum has been utilized as a hole transport layer (HTL) in p-i-n structure PeSC. However, PeSCs based on NiOx HTLs generally struggle to achieve high efficiencies due to energy loss at interfaces. Surface defects and charged species (such as OH-, H+ and ions) at the NiOx interface can hinder charge transfer and promote decomposition of perovskite, which are moderate high power conversion efficiency (PCE) and long-term operational stability. In this regard, we tried surface treatment based on plasma to modify the interface between NiOx and perovskite layers by removing defect sites and hydroxyl groups on the NiOx surface. Plasma treatment reduced defects and charged species on the NiO surface, enhancing the energy level alignment between the NiOx HTL and the perovskite layer and improving charge transport, consequently, plasma-treated PSCs showed improved performance.


This work was supported by the National Research Foundation (NRF) of Korea (NRF-2021R1A2C2010353 and 2020R1I1A1A01051961) and the Korea Electric Power Corporation (CX72220014).

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