Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI3)x(MAPbI3 )1-x perovskite films and solar cells

Subedi, Biwas; Li, Chongwen; Junda, Maxwell M.; Song, Zhaoning; Yan, Yanfa; Podraza, Nikolas J.

doi:10.1063/1.5126867

Title: Effects of intrinsic and atmospherically induced defects in narrow bandgap (FASnI₃)_x(MAPbI₃ )_1-x perovskite films and solar cells

Journal Article · 09 February 2020 · Journal of Chemical Physics

DOI: https://doi.org/10.1063/1.5126867 · OSTI ID:1599337

Subedi, Biwas ^[1]; Li, Chongwen ^[2];

^[2];

^[2]; Podraza, Nikolas J. ^[2]

Univ. of Toledo, OH (United States); University of Toledo
Univ. of Toledo, OH (United States)

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.

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Research Organization:: Univ. of Toledo, OH (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Solar Energy Technologies Office (EE-4S)

Grant/Contract Number:: EE0008753

OSTI ID:: 1599337

Journal Information:: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 6 Vol. 152; ISSN 0021-9606

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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