Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap that sacrifices the device photocurrent. Here we report the fabrication of phase-pure formamidinium-lead tri-iodide perovskite films with excellent optoelectronic quality and stability. Incorporation of 1.67 mol% of 2D phenylethylammonium lead iodide into the precursor solution enables the formation of phase-pure formamidinium perovskite with an order of magnitude enhanced photoluminescence lifetime. The 2D perovskite spontaneously forms at grain boundaries to protect the formamidinium perovskite from moisture and suppress ion migration. A stabilized power conversion efficiency (PCE) of 20.64% (certified stabilized PCE of 19.77%) is achieved with a short-circuit current density exceeding 24 mA cm−2 and an open-circuit voltage of 1.130 V, corresponding to a loss-in-potential of 0.35 V, and significantly enhanced operational stability.
%0 Journal Article
%1 lee2018perovskite
%A Lee, Jin-Wook
%A Dai, Zhenghong
%A Han, Tae-Hee
%A Choi, Chungseok
%A Chang, Sheng-Yung
%A Lee, Sung-Joon
%A De Marco, Nicholas
%A Zhao, Hongxiang
%A Sun, Pengyu
%A Huang, Yu
%A Yang, Yang
%D 2018
%J Nature Communications
%K 2D/3D_heterostructure high_JSC high_PCE perovskite stability
%N 1
%P 3021--
%R 10.1038/s41467-018-05454-4
%T 2D perovskite stabilized phase-pure formamidinium perovskite solar cells
%U https://doi.org/10.1038/s41467-018-05454-4
%V 9
%X Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap that sacrifices the device photocurrent. Here we report the fabrication of phase-pure formamidinium-lead tri-iodide perovskite films with excellent optoelectronic quality and stability. Incorporation of 1.67 mol% of 2D phenylethylammonium lead iodide into the precursor solution enables the formation of phase-pure formamidinium perovskite with an order of magnitude enhanced photoluminescence lifetime. The 2D perovskite spontaneously forms at grain boundaries to protect the formamidinium perovskite from moisture and suppress ion migration. A stabilized power conversion efficiency (PCE) of 20.64% (certified stabilized PCE of 19.77%) is achieved with a short-circuit current density exceeding 24 mA cm−2 and an open-circuit voltage of 1.130 V, corresponding to a loss-in-potential of 0.35 V, and significantly enhanced operational stability.
@article{lee2018perovskite,
abstract = {Compositional engineering has been used to overcome difficulties in fabricating high-quality phase-pure formamidinium perovskite films together with its ambient instability. However, this comes alongside an undesirable increase in bandgap that sacrifices the device photocurrent. Here we report the fabrication of phase-pure formamidinium-lead tri-iodide perovskite films with excellent optoelectronic quality and stability. Incorporation of 1.67 mol% of 2D phenylethylammonium lead iodide into the precursor solution enables the formation of phase-pure formamidinium perovskite with an order of magnitude enhanced photoluminescence lifetime. The 2D perovskite spontaneously forms at grain boundaries to protect the formamidinium perovskite from moisture and suppress ion migration. A stabilized power conversion efficiency (PCE) of 20.64% (certified stabilized PCE of 19.77%) is achieved with a short-circuit current density exceeding 24 mA cm−2 and an open-circuit voltage of 1.130 V, corresponding to a loss-in-potential of 0.35 V, and significantly enhanced operational stability.},
added-at = {2018-08-14T11:45:29.000+0200},
author = {Lee, Jin-Wook and Dai, Zhenghong and Han, Tae-Hee and Choi, Chungseok and Chang, Sheng-Yung and Lee, Sung-Joon and De Marco, Nicholas and Zhao, Hongxiang and Sun, Pengyu and Huang, Yu and Yang, Yang},
biburl = {https://www.bibsonomy.org/bibtex/22c6c87a78644220939fa603003875726/bretschneider_m},
doi = {10.1038/s41467-018-05454-4},
interhash = {a101e0c426a1b9c6d7fdeace3ecff954},
intrahash = {2c6c87a78644220939fa603003875726},
issn = {20411723},
journal = {Nature Communications},
keywords = {2D/3D_heterostructure high_JSC high_PCE perovskite stability},
number = 1,
pages = {3021--},
refid = {Lee2018},
timestamp = {2018-08-14T11:45:29.000+0200},
title = {2D perovskite stabilized phase-pure formamidinium perovskite solar cells},
url = {https://doi.org/10.1038/s41467-018-05454-4},
volume = 9,
year = 2018
}