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Title: Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI 3) x(MAPbI 3 ) 1-x perovskite films and solar cells

Abstract

Narrow band gap mixed tin (Sn) + lead (Pb) perovskites are vital as the bottom sub-cell absorber in high efficiency all-perovskite polycrystalline tandem solar cells. Here, we report on the impact of mixed cation composition and atmospheric exposure of perovskite films on sub-gap absorption in films and performance of solar cells based on narrow band gap mixed formamidinium (FA) + methylammonium (MA) and Sn+Pb halide perovskites, (FASnI 3) x(MAPbI 3) 1-x. Structural and optical properties of 0.3 ≤ x ≤ 0.8 (FASnI 3) x(MAPbI 3) 1-x perovskite thin film absorbers with band gaps ranging from 1.25 ( x = 0.6) to 1.34 eV (x = 0.3) are probed with and without atmospheric exposure. Urbach energy, which quantifies the amount of sub-gap absorption, is tracked for pristine perovskite films as a function of composition, with x = 0.6 and 0.3 demonstrating the lowest and highest Urbach energies of 23 and 36 meV, respectively. Films with x = 0.5 and 0.6 compositions show less degradation upon atmospheric exposure than higher or lower Sn-content films having greater sub-gap absorption. The corresponding solar cells based on the x = 0.6 absorber show the highest device performance. Despite having a low Urbach energy, higher Sn-contentmore » solar cells show reduced device performances as the amount of degradation via oxidation is the most substantial.« less

Authors:
 [1];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Univ. of Toledo, OH (United States)
Publication Date:
Research Org.:
Univ. of Toledo, OH (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office
OSTI Identifier:
1599337
Alternate Identifier(s):
OSTI ID: 1598732
Grant/Contract Number:  
EE0008753; FOA-0000990
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 152; Journal Issue: 6; Journal ID: ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Citation Formats

Subedi, Biwas, Li, Chongwen, Junda, Maxwell M., Song, Zhaoning, Yan, Yanfa, and Podraza, Nikolas J. Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI3)x(MAPbI3 )1-x perovskite films and solar cells. United States: N. p., 2020. Web. doi:10.1063/1.5126867.
Subedi, Biwas, Li, Chongwen, Junda, Maxwell M., Song, Zhaoning, Yan, Yanfa, & Podraza, Nikolas J. Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI3)x(MAPbI3 )1-x perovskite films and solar cells. United States. https://doi.org/10.1063/1.5126867
Subedi, Biwas, Li, Chongwen, Junda, Maxwell M., Song, Zhaoning, Yan, Yanfa, and Podraza, Nikolas J. Mon . "Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI3)x(MAPbI3 )1-x perovskite films and solar cells". United States. https://doi.org/10.1063/1.5126867.
@article{osti_1599337,
title = {Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI3)x(MAPbI3 )1-x perovskite films and solar cells},
author = {Subedi, Biwas and Li, Chongwen and Junda, Maxwell M. and Song, Zhaoning and Yan, Yanfa and Podraza, Nikolas J.},
abstractNote = {Narrow band gap mixed tin (Sn) + lead (Pb) perovskites are vital as the bottom sub-cell absorber in high efficiency all-perovskite polycrystalline tandem solar cells. Here, we report on the impact of mixed cation composition and atmospheric exposure of perovskite films on sub-gap absorption in films and performance of solar cells based on narrow band gap mixed formamidinium (FA) + methylammonium (MA) and Sn+Pb halide perovskites, (FASnI3)x(MAPbI3)1-x. Structural and optical properties of 0.3 ≤ x ≤ 0.8 (FASnI3)x(MAPbI3)1-x perovskite thin film absorbers with band gaps ranging from 1.25 (x = 0.6) to 1.34 eV (x = 0.3) are probed with and without atmospheric exposure. Urbach energy, which quantifies the amount of sub-gap absorption, is tracked for pristine perovskite films as a function of composition, with x = 0.6 and 0.3 demonstrating the lowest and highest Urbach energies of 23 and 36 meV, respectively. Films with x = 0.5 and 0.6 compositions show less degradation upon atmospheric exposure than higher or lower Sn-content films having greater sub-gap absorption. The corresponding solar cells based on the x = 0.6 absorber show the highest device performance. Despite having a low Urbach energy, higher Sn-content solar cells show reduced device performances as the amount of degradation via oxidation is the most substantial.},
doi = {10.1063/1.5126867},
url = {https://www.osti.gov/biblio/1599337}, journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 6,
volume = 152,
place = {United States},
year = {2020},
month = {2}
}

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