La-Doped BaSnO$_3$ Electron Transport Layer for Perovskite Solar Cells

TL;DR

This paper introduces La-doped BaSnO$_3$ as a stable, high-mobility electron transport layer for perovskite solar cells, addressing issues of instability in traditional TiO$_2$ layers.

Contribution

It demonstrates the ideal band alignment and stability of La-doped BaSnO$_3$ with perovskite materials, proposing it as a promising alternative ETL.

Findings

LBSO exhibits high mobility and photo-stability.

Stable heterostructure with perovskite layer.

Band gap tuning via La-doping enhances performance.

Abstract

Due to the photo-instability and hysteresis of TiO$_2$ electron transport layer (ETL) in perovskite solar cells (PSCs), novel electron transport materials are highly demanded. Here, we show ideal band alignment between La-doped BaSnO$_3$ (LBSO) and methyl ammonium (MA) lead iodide perovskite (MAPbI$_3$). The CH$_3$NH$_3$PbI$_3$/La$_x$Ba$_{(1-x)}$SnO$_3$ interface forms a stable all-perovskite heterostructure. The selective band alignment is manipulated with band gap renormalization by La-doping on the Ba site. LBSO shows high mobility, photo-stability, and structural stability, promising the next generation ETL materials.