Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/162412
Title: Efficient bandgap widening in co-evaporated MAPbI₃ perovskite
Authors: Dewi, Herlina Arianita
Li, Jia
Erdenebileg, Enkhtur
Wang, Hao
De Bastiani, Michele
De Wolf, Stefaan
Mathews, Nripan
Mhaisalkar, Subodh
Bruno, Annalisa
Keywords: Engineering::Materials
Issue Date: 2022
Source: Dewi, H. A., Li, J., Erdenebileg, E., Wang, H., De Bastiani, M., De Wolf, S., Mathews, N., Mhaisalkar, S. & Bruno, A. (2022). Efficient bandgap widening in co-evaporated MAPbI₃ perovskite. Sustainable Energy and Fuels, 6(10), 2428-2438. https://dx.doi.org/10.1039/d1se01692j
Project: S18-1176- SCRP 
NRF2018-ITC001-001 
Journal: Sustainable Energy and Fuels 
Abstract: Co-evaporated perovskite solar cells (PSCs) have demonstrated outstanding properties, such as great scalability, intrinsic stability, high-power conversion efficiency (PCE), and fabrication adaptability even on rough surfaces. At present, MAPbI3 is the most used co-evaporated perovskite due to the complexity of forming multi-component compositions by thermal evaporation. Even though PSCs with high PCEs have been obtained, the MAPbI3 bandgap (∼1.60 eV) is not ideal for multijunction devices. In this work, we propose a facile method to increase the bandgap of co-evaporated MAPbI3 (∼1.60 eV) through a MABr-based treatment. The best MABr-treated perovskite composition films show a bandgap of 1.66 eV (MAPb(Br0.18I0.82)3) and exhibit good spectral stability under continuous 1-sun illumination at the ambient conditions of 28 °C and 70% relative humidity. This hybrid method works efficiently for thick co-evaporated MAPbI3 films (∼750 nm), which is unusual for hybrid processes. The n-i-p PSCs built from the MAPb(Br0.18I0.82)3 films exhibit a blue-shifted external quantum efficiency and a Voc increase of ∼30 mV as compared to the pure MAPbI3 PSCs, in agreement with the bandgap widening observed in the films. This hybrid method to crete wide bandgap perovskites can be universally applied to MAPbI3 deposited on both flat and textured surfaces and shows great promise for its integration in monolithic tandems.
URI: https://hdl.handle.net/10356/162412
ISSN: 2398-4902
DOI: 10.1039/d1se01692j
Rights: © 2022 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles
MSE Journal Articles

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