DataVXAdvanced Energy MaterialsPaper
journal article·2022-12Open access

Suppressing Interfacial Recombination with a Strong‐Interaction Surface Modulator for Efficient Inverted Perovskite Solar Cells

Bowei Li, Jun Deng, Joel A. Smith, Pietro Caprioglio, Kangyu Ji, Deying Luo, James D. McGettrick, K. D. G. Imalka Jayawardena, Rachel C. Kilbride, Aobo Ren, Steven Hinder, Jinxin Bi, Thomas Webb, Igor Marko, Xueping Liu, Yuren Xiang, Josh Reding, Hui Li, Shixuan Du, David G. Lidzey, Samuel D. Stranks, Trystan Watson, Stephen Sweeney, Henry J. Snaith, S. Ravi P. Silva, Wei Zhang

Advanced Energy Materials· Volume 12· Issue 48
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Source abstract

Abstract

Abstract Successful manipulation of halide perovskite surfaces is typically achieved via the interactions between modulators and perovskites. Herein, it is demonstrated that a strong‐interaction surface modulator is beneficial to reduce interfacial recombination losses in inverted (p‐i‐n) perovskite solar cells (IPSCs). Two organic ammonium salts are investigated, consisting of 4‐hydroxyphenethylammonium iodide and 2‐thiopheneethylammonium iodide (2‐TEAI). Without thermal annealing, these two modulators can recover the photoluminescence quantum yield of the neat perovskite film in contact with fullerene electron transport layer (ETL). Compared to the hydroxyl‐functionalized phenethylammonium moiety, the thienylammonium facilitates the formation of a quasi‐2D structure onto the perovskite. Density functional theory and quasi‐Fermi level splitting calculations reveal that the 2‐TEAI has a stronger interaction with the perovskite surface, contributing to more suppressed non‐radiative recombination at the perovskite/ETL interface and improved open‐circuit voltage (VOC) of the fabricated IPSCs. As a result, the VOC increases from 1.11 to 1.20 V (based on a perovskite bandgap of 1.63 eV), yielding a power conversion efficiency (PCE) from ≈20% to 21.9% (stabilized PCE of 21.3%, the highest reported PCEs for IPSCs employing poly[N,N′′‐bis(4‐butylphenyl)‐N,N′′‐bis(phenyl)benzidine] as the hole transport layer, alongside the enhanced operational and shelf‐life stability for unencapsulated devices.
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Research context

Electronic materialsMaterials processing

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Advanced Technology Institute Department of Electrical and Electronic Engineering University of Surrey Guildford GU2 7XH UK

Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

Clarendon Laboratory Department of Physics University of Oxford Oxford OX1 3PU UK

Cavendish Laboratory University of Cambridge Cambridge CB3 0HE UK

Department of Materials Science and Engineering University of Toronto Toronto M5G 3E4 Canada

SPECIFIC College of Engineering Swansea University Swansea SA1 8EN UK

Department of Chemistry University of Sheffield Sheffield S3 7HF UK

Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 610054 China

The Surface Analysis Laboratory Department of Mechanical Engineering Sciences University of Surrey Guildford GU2 7XH UK

Advanced Technology Institute Department of Physics University of Surrey Guildford GU2 7XH UK

Department of Physics and Astronomy University of Sheffield Sheffield S3 7RH UK

Department of Chemical Engineering and Biotechnology University of Cambridge Cambridge CB3 0AS UK

Funding

Engineering and Physical Sciences Research Council · China Scholarship Council · University of Surrey · Royal Society · European Research Council · Tata Sons · State Key Laboratory of Advanced Materials and Electronic Components, Guangdong Fenghua Advanced Technology Holding · Key Technologies Research and Development Program · Chinese Government Scholarship

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