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Low-Bandgap Mixed Tin-Lead Iodide Perovskite with Large Grains for High Performance Solar Cells

Abstract

Tin (Sn) based perovskites have drawn much attention for their narrower band gap and are more eco-friendly. However, general one-step processing method leads to poor quality Sn-based perovskite films. Here, high quality low-bandgap mixed Sn-Pb perovskite films were achieved on hydrophobic hole transport layer by two-step processing method from the Sn0.3Pb0.7I2 and FA0.7MA0.3I precursors in sequence. The obtained dense FA0.7MA0.3Sn0.3Pb0.7I3 film shows a low-bandgap of 1.26 eV, and larger grains compared with the one-step processed ones. Using this high-quality films prepared, we fabricated FA0.7MA0.3Sn0.3Pb0.7I3-based inverted perovskite solar cells (PVSCs) with a maximum power conversion efficiency (PCE) of 13.6% with a negligible current-voltage hysteresis, which is among the best PCEs for low-bandgap Sn-based PVSCs. The enhanced performance is attributed to the reduced recombination and improved charge transportation caused by the vertically aligned larger grains and higher crystallinity in perovskite film. The unencapsulated cells remained 80% of initial performance after 30 d storage in glove-box. This work provides one simple path toward high quality film for high performance Sn-based perovskite solar cells.

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Publication details

The article was received on 03 Apr 2018, accepted on 11 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA03054E
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Low-Bandgap Mixed Tin-Lead Iodide Perovskite with Large Grains for High Performance Solar Cells

    Y. Wang, W. Fu, J. Yan, J. Chen, W. Yang and H. Chen, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA03054E

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