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Issue 45, 2018
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La-doped BaSnO3 electron transport layer for perovskite solar cells

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Abstract

Due to the photoinstability and large hysteresis of the TiO2 electron transport layer (ETL) in perovskite solar cells (PSCs), the search for novel electron transport materials has emerged. Herein, using first principles calculations, we unveiled the key factor for the ideal band alignment between La-doped BaSnO3 (LBSO) and methyl ammonium (MA) lead iodide perovskite (MAPbI3). The (PbI2-, MAI-terminated)CH3NH3PbI3/(SnO2-, BaO-terminated)LaxBa(1−x)SnO3 interface formed a stable “all-perovskite” heterostructure with large binding energy. The selective band alignment of the conduction band was easily manipulated by La-doping on the Ba site due to the band gap renormalization (or shrinkage) caused by doped electrons and La3+ dopant. In addition, the MAI-terminated MAPbI3/LBSO interface exhibited proton transfer (BaO-terminated) and strong hydrogen bonding (SnO2-terminated) between MA and oxygen anion. LBSO presenting high mobility, photostability, and structural stability would help develop the next generation ETL materials for PSCs.

Graphical abstract: La-doped BaSnO3 electron transport layer for perovskite solar cells

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Supplementary files

Article information


Submitted
10 Sep 2018
Accepted
23 Oct 2018
First published
23 Oct 2018

J. Mater. Chem. A, 2018,6, 23071-23077
Article type
Paper

La-doped BaSnO3 electron transport layer for perovskite solar cells

C. W. Myung, G. Lee and K. S. Kim, J. Mater. Chem. A, 2018, 6, 23071
DOI: 10.1039/C8TA08764D

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