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Title: Light-activated photocurrent degradation and self-healing in perovskite solar cells

Solution-processed organometallic perovskite solar cells have emerged as one of the most promising thin-film photovoltaic technology. But, a key challenge is their lack of stability over prolonged solar irradiation. Few studies have investigated the effect of light soaking on hybrid perovskites and have attributed the degradation in the optoelectronic properties to photochemical or field-assisted ion migration. We show that the slow photocurrent degradation in thin-film photovoltaic devices is due to the formation of light-activated meta-stable deep-level trap states. However, the devices can self-heal completely by resting them in the dark for <1 min or the degradation can be completely prevented by operating the devices at 0 °C. Here, we investigate several physical mechanisms to explain the microscopic origin for the formation of these trap states, among which the creation of small polaronic states involving localized cooperative lattice strain and molecular orientations emerges as a credible microscopic mechanism requiring further detailed studies.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [6] ;  [4] ; ORCiD logo [7] ; ORCiD logo [8] ;  [3] ;  [2] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Physics and Application Division
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Chemical Division
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
  4. Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials
  5. Rutgers Univ., Piscataway, NJ (United States). Dept. of Materials Science and Engineering
  6. Purdue Univ., West Lafayette, IN (United States). School of Electrical and Computer Engineering
  7. Univ. of Rennes (France). Inst. of Chemical Sciences
  8. French National Center for Scientific Research (CNRS), Rennes (France). Optical Functions for Information Technology
Publication Date:
Report Number(s):
BNL-112600-2016-JA; LA-UR-17-22531
Journal ID: ISSN 2041-1723; R&D Project: 16063; 16058; KC0403020
Grant/Contract Number:
SC00112704; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 14 SOLAR ENERGY; Center for Functional Nanomaterials
OSTI Identifier:
1336133
Alternate Identifier(s):
OSTI ID: 1357139

Nie, Wanyi, Blancon, Jean-Christophe, Neukirch, Amanda J., Appavoo, Kannatassen, Tsai, Hsinhan, Chhowalla, Manish, Alam, Muhammad A., Sfeir, Matthew Y., Katan, Claudine, Even, Jacky, Tretiak, Sergei, Crochet, Jared J., Gupta, Gautam, and Mohite, Aditya D.. Light-activated photocurrent degradation and self-healing in perovskite solar cells. United States: N. p., Web. doi:10.1038/ncomms11574.
Nie, Wanyi, Blancon, Jean-Christophe, Neukirch, Amanda J., Appavoo, Kannatassen, Tsai, Hsinhan, Chhowalla, Manish, Alam, Muhammad A., Sfeir, Matthew Y., Katan, Claudine, Even, Jacky, Tretiak, Sergei, Crochet, Jared J., Gupta, Gautam, & Mohite, Aditya D.. Light-activated photocurrent degradation and self-healing in perovskite solar cells. United States. doi:10.1038/ncomms11574.
Nie, Wanyi, Blancon, Jean-Christophe, Neukirch, Amanda J., Appavoo, Kannatassen, Tsai, Hsinhan, Chhowalla, Manish, Alam, Muhammad A., Sfeir, Matthew Y., Katan, Claudine, Even, Jacky, Tretiak, Sergei, Crochet, Jared J., Gupta, Gautam, and Mohite, Aditya D.. 2016. "Light-activated photocurrent degradation and self-healing in perovskite solar cells". United States. doi:10.1038/ncomms11574. https://www.osti.gov/servlets/purl/1336133.
@article{osti_1336133,
title = {Light-activated photocurrent degradation and self-healing in perovskite solar cells},
author = {Nie, Wanyi and Blancon, Jean-Christophe and Neukirch, Amanda J. and Appavoo, Kannatassen and Tsai, Hsinhan and Chhowalla, Manish and Alam, Muhammad A. and Sfeir, Matthew Y. and Katan, Claudine and Even, Jacky and Tretiak, Sergei and Crochet, Jared J. and Gupta, Gautam and Mohite, Aditya D.},
abstractNote = {Solution-processed organometallic perovskite solar cells have emerged as one of the most promising thin-film photovoltaic technology. But, a key challenge is their lack of stability over prolonged solar irradiation. Few studies have investigated the effect of light soaking on hybrid perovskites and have attributed the degradation in the optoelectronic properties to photochemical or field-assisted ion migration. We show that the slow photocurrent degradation in thin-film photovoltaic devices is due to the formation of light-activated meta-stable deep-level trap states. However, the devices can self-heal completely by resting them in the dark for <1 min or the degradation can be completely prevented by operating the devices at 0 °C. Here, we investigate several physical mechanisms to explain the microscopic origin for the formation of these trap states, among which the creation of small polaronic states involving localized cooperative lattice strain and molecular orientations emerges as a credible microscopic mechanism requiring further detailed studies.},
doi = {10.1038/ncomms11574},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {5}
}