Stabilization of Highly Efficient and Stable Phase‐Pure FAPbI 3 Perovskite Solar Cells by Molecularly Tailored 2D‐Overlayers
Abstract As a result of their attractive optoelectronic properties, metal halide APbI 3 perovskites employing formamidinium (FA + ) as the A cation are the focus of research. The superior chemical and thermal stability of FA + cations makes α‐FAPbI 3 more suitable for solar‐cell applications than me...
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Published in | Angewandte Chemie Vol. 132; no. 36; pp. 15818 - 15824 |
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Main Authors | , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.09.2020
|
Online Access | Get full text |
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Summary: | Abstract
As a result of their attractive optoelectronic properties, metal halide APbI
3
perovskites employing formamidinium (FA
+
) as the A cation are the focus of research. The superior chemical and thermal stability of FA
+
cations makes α‐FAPbI
3
more suitable for solar‐cell applications than methylammonium lead iodide (MAPbI
3
). However, its spontaneous conversion into the yellow non‐perovskite phase (
δ
‐FAPbI
3
) under ambient conditions poses a serious challenge for practical applications. Herein, we report on the stabilization of the desired α‐FAPbI
3
perovskite phase by protecting it with a two‐dimensional (2D) IBA
2
FAPb
2
I
7
(IBA=
iso
‐butylammonium overlayer, formed via stepwise annealing. The α‐FAPbI
3
/IBA
2
FAPb
2
I
7
based perovskite solar cell (PSC) reached a high power conversion efficiency (PCE) of close to 23 %. In addition, it showed excellent operational stability, retaining around 85 % of its initial efficiency under severe combined heat and light stress, that is, simultaneous exposure with maximum power tracking to full simulated sunlight at 80 °C over 500 h. |
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ISSN: | 0044-8249 1521-3757 |
DOI: | 10.1002/ange.202005211 |