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  4. Over 24% efficient MA-free Cs(x)FA(1-x)PbX(3) perovskite solar cells
 
research article

Over 24% efficient MA-free Cs(x)FA(1-x)PbX(3) perovskite solar cells

Wang, Siyang
•
Tan, Liguo
•
Zhou, Junjie
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June 15, 2022
Joule

Methylammonium (MA)-free perovskites such as Cs(x)FA(1-x)PbX(3) (CsFA) show excellent thermal stability, favoring their use in perovskite solar cells (PSCs). However, the power conversion efficiency (PCE) of CsFA lags behind that of MA-containing formulations due to the difficulty in controlling the film morphology. Herein, we report innovative morphology engineering using solution deposition of a mixture of CsBr, Pbl(2), and PbCl2 followed by vacuum evaporation of formamidinium iodide (FAI) to fabricate CsFA films. The introduction of a chloride precursor leads to larger grain sizes, forming a high-quality CsFA film under annealing. This enables the realization of robust CsFA-based PSCs with the highest reported PCE up to 24.1% (certified 23.9%) for 0.1 cm(2) and 22.8% for 1 cm(2) devices. Moreover, the unencapsulated evaporation device shows excellent stability with negligible efficiency decline after 20,000 h of storage in dry air or 1,000 h of exposure to 50% humidity, which is much better than the device prepared using the solution procedure.

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Type
research article
DOI
10.1016/j.joule.2022.05.002
Web of Science ID

WOS:000819196200005

Author(s)
Wang, Siyang
Tan, Liguo
Zhou, Junjie
Li, Minghao
Zhao, Xing
Li, Hang
Tress, Wolfgang
Ding, Liming
Graetzel, Michael  
Yi, Chenyi
Date Issued

2022-06-15

Publisher

CELL PRESS

Published in
Joule
Volume

6

Issue

6

Start page

1344

End page

1356

Subjects

Chemistry, Physical

•

Energy & Fuels

•

Materials Science, Multidisciplinary

•

Chemistry

•

Energy & Fuels

•

Materials Science

•

halide perovskites

•

formamidinium

•

performance

•

modules

•

area

•

stabilization

•

stability

•

cesium

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LPI  
Available on Infoscience
July 18, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/189352
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