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首页> 外文期刊>Advanced functional materials >Highly Stable n–i–p Structured Formamidinium Tin Triiodide Solar Cells through the Stabilization of Surface Sn~(2+) Cations
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Highly Stable n–i–p Structured Formamidinium Tin Triiodide Solar Cells through the Stabilization of Surface Sn~(2+) Cations

机译：Highly Stable n–i–p Structured Formamidinium Tin Triiodide Solar Cells through the Stabilization of Surface Sn~(2+) Cations

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摘要

Improving the performance, reproducibility, and stability of Sn-based perovskitesolar cells (PSCs) with n–i–p structures is an important challenge. Spiro-OMeTAD [2,2′,7,7′-tetrakis(N,N-di-p-methoxyphenyl-amine)9,9′-spirobifluorene],a hole transporting material (HTM) with n–i–p structure, requires the oxygenexposure after addition of Li-TFSI [Lithium bis(trifluoromethanesulfonyl)imide] as a dopant to increase the hole concentration. In Sn-based PSC,Sn2+ is easily oxidized to Sn4+ under such a condition, resulting in a sharpdecrease in efficiency. Herein, a formamidinium tin triiodide (FASnI3)-basedPSCs fabricated using DPI-TPFB [4-Isopropyl-4′-methyldiphenyliodoniumtetrakis(pentafluorophenyl)borate] instead of Li-TFSI are reported as a dopantin Spiro-OMeTAD. The DPI-TPFB enables the fabrication of PSCs with an efficiencyof up to 10.9%, the highest among FASnI3-based PSCs with n–i–p structures.Moreover, ≈80% of the initial efficiency is maintained even after 1,597 hunder maximum power point tracking conditions. In particular, the encapsulateddevice does not show any decrease in efficiency even after holding for50 h in the 85 ℃/85% RH condition. The high efficiency and excellent stabilityof PSCs prepared by doping with DPI-TPFB are attributed to not only increasingelectrical conductivity by acting as a Lewis acid, but also stabilizing Sn~(2+)through coordination with Sn~(2+) on the surface of FASnI_3.

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