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Title: Light-induced lattice expansion leads to high-efficiency perovskite solar cells

Abstract

Hybrid-perovskite based high-performance optoelectronic devices and clues from their operation has led to the realization that light-induced structural dynamics play a vital role on their physical properties, device performance and stability. Here, we report that continuous light illumination leads to a uniform lattice expansion in hybrid perovskite thin-films, which is critical for obtaining high-efficiency photovoltaic devices. Correlated, in-situ structural and device characterizations reveal that light-induced lattice expansion significantly benefits the performances of a mixed-cation pure-halide planar device, boosting the power conversion efficiency from 18.5% to 20.5%. This is a direct consequence of the relaxation of local lattice strains during lattice expansion, which results in the reduction of the energetic barriers at the perovskite/contact interfaces in devices, thus improving the open circuit voltage and fill factor. The light-induced lattice expansion stabilizes these high-efficiency photovoltaic devices under continuous operation of full-spectrum 1-Sun illumination for over 1500 hours. One Sentence Summary: Light-induced lattice expansion improves crystallinity, relaxes lattice strain, which enhances photovoltaic performance in hybrid perovskite device.

Authors:
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Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1433058
DOE Contract Number:
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Science; Journal Volume: 360; Journal Issue: 6384
Country of Publication:
United States
Language:
English

Citation Formats

Tsai, Hsinhan, Asadpour, Reza, Blancon, Jean-Christophe, Stoumpos, Constantinos C., Durand, Olivier, Strzalka, Joseph W., Chen, Bo, Verduzco, Rafael, Ajayan, Pulickel M., Tretiak, Sergei, Even, Jacky, Alam, Muhammad Ashraf, Kanatzidis, Mercouri G., Nie, Wanyi, and Mohite, Aditya D.. Light-induced lattice expansion leads to high-efficiency perovskite solar cells. United States: N. p., 2018. Web. doi:10.1126/science.aap8671.
Tsai, Hsinhan, Asadpour, Reza, Blancon, Jean-Christophe, Stoumpos, Constantinos C., Durand, Olivier, Strzalka, Joseph W., Chen, Bo, Verduzco, Rafael, Ajayan, Pulickel M., Tretiak, Sergei, Even, Jacky, Alam, Muhammad Ashraf, Kanatzidis, Mercouri G., Nie, Wanyi, & Mohite, Aditya D.. Light-induced lattice expansion leads to high-efficiency perovskite solar cells. United States. doi:10.1126/science.aap8671.
Tsai, Hsinhan, Asadpour, Reza, Blancon, Jean-Christophe, Stoumpos, Constantinos C., Durand, Olivier, Strzalka, Joseph W., Chen, Bo, Verduzco, Rafael, Ajayan, Pulickel M., Tretiak, Sergei, Even, Jacky, Alam, Muhammad Ashraf, Kanatzidis, Mercouri G., Nie, Wanyi, and Mohite, Aditya D.. Thu . "Light-induced lattice expansion leads to high-efficiency perovskite solar cells". United States. doi:10.1126/science.aap8671.
@article{osti_1433058,
title = {Light-induced lattice expansion leads to high-efficiency perovskite solar cells},
author = {Tsai, Hsinhan and Asadpour, Reza and Blancon, Jean-Christophe and Stoumpos, Constantinos C. and Durand, Olivier and Strzalka, Joseph W. and Chen, Bo and Verduzco, Rafael and Ajayan, Pulickel M. and Tretiak, Sergei and Even, Jacky and Alam, Muhammad Ashraf and Kanatzidis, Mercouri G. and Nie, Wanyi and Mohite, Aditya D.},
abstractNote = {Hybrid-perovskite based high-performance optoelectronic devices and clues from their operation has led to the realization that light-induced structural dynamics play a vital role on their physical properties, device performance and stability. Here, we report that continuous light illumination leads to a uniform lattice expansion in hybrid perovskite thin-films, which is critical for obtaining high-efficiency photovoltaic devices. Correlated, in-situ structural and device characterizations reveal that light-induced lattice expansion significantly benefits the performances of a mixed-cation pure-halide planar device, boosting the power conversion efficiency from 18.5% to 20.5%. This is a direct consequence of the relaxation of local lattice strains during lattice expansion, which results in the reduction of the energetic barriers at the perovskite/contact interfaces in devices, thus improving the open circuit voltage and fill factor. The light-induced lattice expansion stabilizes these high-efficiency photovoltaic devices under continuous operation of full-spectrum 1-Sun illumination for over 1500 hours. One Sentence Summary: Light-induced lattice expansion improves crystallinity, relaxes lattice strain, which enhances photovoltaic performance in hybrid perovskite device.},
doi = {10.1126/science.aap8671},
journal = {Science},
number = 6384,
volume = 360,
place = {United States},
year = {Thu Apr 05 00:00:00 EDT 2018},
month = {Thu Apr 05 00:00:00 EDT 2018}
}