# Conformal quantum dot–SnO 2 layers as electron transporters for efficient perovskite solar cells

“Conformal quantum dot–SnO 2 layers as electron transporters for efficient perovskite solar cells” (2022), by Minjin Kim et al. Engineering research paper. Original abstract below, unchanged. No free PDF was found.

- Authors: Minjin Kim, Jaeki Jeong, Haizhou Lu, Tae Kyung Lee, Felix T. Eickemeyer, Yuhang Liu, In Woo Choi, Seung Ju Choi, Yimhyun Jo, Hak-Beom Kim et al.
- Published: January 20, 2022
- Field: Engineering
- DOI: https://doi.org/10.1126/science.abh1885
- Source: https://doi.org/10.1126/science.abh1885

## Abstract

Improvements to perovskite solar cells (PSCs) have focused on increasing their power conversion efficiency (PCE) and operational stability and maintaining high performance upon scale-up to module sizes. We report that replacing the commonly used mesoporous–titanium dioxide electron transport layer (ETL) with a thin layer of polyacrylic acid–stabilized tin(IV) oxide quantum dots (paa-QD-SnO 2 ) on the compact–titanium dioxide enhanced light capture and largely suppressed nonradiative recombination at the ETL–perovskite interface. The use of paa-QD-SnO 2 as electron-selective contact enabled PSCs (0.08 square centimeters) with a PCE of 25.7% (certified 25.4%) and high operational stability and facilitated the scale-up of the PSCs to larger areas. PCEs of 23.3, 21.7, and 20.6% were achieved for PSCs with active areas of 1, 20, and 64 square centimeters, respectively.

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