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Updated: Oct 21, 2026

Influence of Hybrid Perovskite Fabrication Methods on Film Formation, Electronic Structure, and Solar Cell Performance
Published on: February 27, 2017
Composition-Dependent Interfacial Energetics in p-i-n Perovskite Solar Cells
Yu-Na Lee1, Kyung-Min Han1, Yun-Kyeong Hong1
1Department of Chemistry and Chemical Engineering, Inha University, Incheon22212, Republic of Korea.
Abstract:
Compositional engineering offers a direct route to tuning the absorber band structure and interfacial energy alignment in perovskite solar cells (PSCs). We systematically varied the formamidinium (FA)/methylammonium (MA) and I/Br ratios in Cs0.05(FAxMA1-x)0.95Pb(IxBr1-x)3 perovskites to examine how composition governs charge extraction, interfacial recombination, and photovoltaic performance in p-i-n-structured devices. Increasing the FA and I content gradually narrowed the optical bandgap through the progressive shift in the perovskite band edges, which in turn modified the band offset at the interfaces with both p- and n-type selective contacts. The resultant photovoltaic performance of p-i-n devices (MeO-2PACz/perovskite/C60) was monitored closely with composition across the series, reaching an optimum at x = 0.93. Impedance spectroscopy confirmed that carrier extraction efficiency and recombination dynamics are governed by the composition-dependent interfacial band alignment and defect density.
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