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Molten Salts Assisted Interfacial Engineering for Efficient and Low‐Cost Full‐Inorganic Antimony Sulfide Solar Cells

2022; Wiley; Volume: 32; Issue: 48 Linguagem: Inglês

10.1002/adfm.202208409

1616-3028

Yu Mao, Yi‐Hua Hu, Xiao‐Yang Hu, Liquan Yao, Hu Li, Limei Lin, Peng Tang, Hui Li, Shuiyuan Chen, Jianmin Li, Guilin Chen,

Quantum Dots Synthesis And Properties

Abstract Antimony sulfide (Sb 2 S 3 ) is emerging as a promising light harvesting material owing to its brilliant photoelectric property. However, the performance of Sb 2 S 3 ‐based solar cells is partly limited by serious back contact interface recombination and hole transportation resistance. High‐efficiency Sb 2 S 3 devices typically use Spiro‐OMeTAD and/or Au as back contact materials, but their stability and cost are a concern. In this sense, a surface modification scheme by lithium‐doping is first introduced for Sb 2 S 3 via a facile molten salt method. The ions in the molten state have high mobility and activity, enabling doping reactions to complete within a short time. The lithium‐doped Sb 2 S 3 thin film has a smooth and well‐bonded surface, preferred (hk1) orientations, and an upshifted valence band maximum (VBM), which favors the hole extraction. Finally, a device using carbon as an electrode, which is more than a dozen times cheaper than gold, raises the short‐circuit current density ( J SC ) from 12.35 to 14.40 mA cm −2 , and the power conversion efficiency (PCE) from 4.47% to 6.16%. This is among the highest PCE reported for full‐inorganic Sb 2 S 3 solar cells, which demonstrates a facile interface modification technique via molten alkali salt to improve the performance of Sb 2 S 3 solar cells.