Performance Enhancement of Lead-Free Tin-Based Perovskite Solar Cells with Reducing Atmosphere-Assisted Dispersible Additive

Song, Tze-Bin; Yokoyama, Takamichi; Aramaki, Shinji; Kanatzidis, Mercouri G.

doi:10.1021/acsenergylett.7b00171

Performance Enhancement of Lead-Free Tin-Based Perovskite Solar Cells with Reducing Atmosphere-Assisted Dispersible Additive

Journal Article · Thu Mar 09 23:00:00 EST 2017 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.7b00171· OSTI ID:1470357

Song, Tze-Bin ^[1]; ^[2]; Aramaki, Shinji ^[3]; ^[1]

Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Mitsubishi Chemical Group Science and Technology Research Center, Inc., (Japan)
Mitsubishi Chemical Group Science and Technology Research Center, Inc., (Japan)

Sn-based halide perovskite materials have attracted tremendous attention and have been employed successfully in solar cells. However, their high conductivities resulting from the unstable divalent Sn state in the structure cause poor device performance and poor reproducibility. Herein, we used excess tin iodide (SnI₂) in Sn-based halide perovskite solar cells (ASnI₃, A = Cs, methylammonium and formamidinium tin iodide as the representative light absorbers), combined with a reducing atmosphere to stabilize the Sn²⁺ state. Excess SnI₂ can disperse uniformly into the perovskite films and functions as a compensator as well as a suppressor of Sn²⁺ vacancies thereby effectively reducing the p-type conductivity. This process significantly improved the solar-cell performances of all the ASnI3 materials on mesoporous TiO₂. Optimized CsSnI3 devices achieved a maximum power conversion efficiency of 4.81%, which is the highest among all inorganic Pb-free perovskite solar cells to date.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0001059

OSTI ID:: 1470357

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 4 Vol. 2; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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