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

Bowei Li Orcid Logo, Jun Deng, Joel A. Smith, Pietro Caprioglio, Kangyu Ji, Deying Luo, James McGettrick Orcid Logo, 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 Orcid Logo, Stephen Sweeney, Henry J. Snaith, S. Ravi P. Silva, Wei Zhang Orcid Logo

Advanced Energy Materials, Volume: 12, Issue: 48, Start page: 2202868

Swansea University Authors: James McGettrick Orcid Logo, Trystan Watson Orcid Logo

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DOI (Published version): 10.1002/aenm.202202868

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 ce...

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Published in: Advanced Energy Materials
ISSN: 1614-6832 1614-6840
Published: Wiley 2022
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa61965
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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.
Keywords: inverted perovskite solar cells; molecular design, ligands; non-radiative recombination; surface manipulation
College: Faculty of Science and Engineering
Funders: EPSRC. Grant Number: EP/V027131/1 Newton Advanced Fellowship. Grant Number: 192097 China Scholarship Council. Grant Numbers: 201706020158, 760949 Equal Opportunities Foundation Hong Kong Fujian Key Laboratory of Photoelectric Functional Materials. Grant Number: FJPFM-201902 University of Surrey DCSA3 scholarship EPSRC SPECIFIC IKC. Grant Number: EP/N020863/1 UK EPSRC. Grant Number: EP/S009213/1 Royal Society Engineering and Physical Sciences Research Council. Grant Numbers: EP/R023980/1, EP/V027131/1 European Research Council European Union's Horizon 2020. Grant Number: 756962 Royal Society Tata Group. Grant Number: UF150033 State Key Laboratory of Advanced Materials and Electronic Components, Guangdong Fenghua Advanced Technology Holding. Grant Number: 201901 Key Technologies Research and Development Program. Grant Number: 2019YFB1503500 European Commission H2020 CORNET program. Grant Number: 760949 Chinese Government Scholarship. Grant Number: 201808370197
Issue: 48
Start Page: 2202868