Journal
ACS ENERGY LETTERS
Volume 6, Issue 10, Pages 3555-3562Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c01575
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning (MSIP) [NRF-2018R1A3B1052820]
- industry-academic cooperative project of Hyundai Motor Company, Republic of Korea
- UNIST [1.200030.01]
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The study investigates the impact of surface passivation and residual strain control on perovskite films on the photovoltaic device efficiency. By engineering the dual effects of surface passivation and residual strain, a record power conversion efficiency of up to 9.06% was achieved, the highest reported in a typical n-i-p architecture.
The passivation of electronic defects at the surfaces and grain boundaries of perovskite materials is one of the most important strategies for suppressing charge recombination in perovskite solar cells (PSCs). Although several passivation molecules have been investigated, few studies have focused on their application in regulating both the surface passivation and residual strain of perovskite films. In this study, the residual strain distribution profiles of the Cs(0.1)FA(0.9)SnI(3) perovskite thin films and their effect on the photovoltaic device efficiencies were investigated. We found a gradient distribution of the out-of-plane compressive strain that correlated with the compositional inhomogeneity perpendicular to the substrate surface. By deliberately engineering dual effects of the surface passivation and residual strain, we achieved a record power conversion efficiency of up to 9.06%, the highest ever reported in a typical n-i-p architecture.
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