Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI3)x(MAPbI3 )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, (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 amountmore »
- 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:
- 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. https://www.osti.gov/servlets/purl/1599337.
@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},
journal = {Journal of Chemical Physics},
number = 6,
volume = 152,
place = {United States},
year = {Mon Feb 10 00:00:00 EST 2020},
month = {Mon Feb 10 00:00:00 EST 2020}
}
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