Molten Salts Assisted Interfacial Engineering for Efficient and Low‐Cost Full‐Inorganic Antimony Sulfide Solar Cells
Molten Salts Assisted Interfacial Engineering for Efficient and Low‐Cost Full‐Inorganic Antimony Sulfide Solar Cells
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熔盐辅助界面工程用于高效低成本全无机硫化锑太阳能电池
DOI：
10.1002/adfm.202208409
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发表时间：
2022-09
影响因子：
19
通讯作者：
Yu-shi Mao;Yizhen Hu;Xiao-yang Hu;Lili Yao;Hu Li;Limei Lin;Peng Tang;Hui Li;Shuiyuan Chen;Jianmin Li;Gui-Lin Chen
中科院分区：
文献类型：
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作者：
Yu-shi Mao;Yizhen Hu;Xiao-yang Hu;Lili Yao;Hu Li;Limei Lin;Peng Tang;Hui Li;Shuiyuan Chen;Jianmin Li;Gui-Lin Chen
硫化锑（Sb_2S_3）具有优异的光电性能，是一种很有前途的集光材料。然而，Sb 2S 3基太阳能电池的性能在一定程度上受到严重的背接触界面复合和空穴传输阻力的限制。高效Sb 2S 3器件通常使用螺环金属和/或Au作为背接触材料，但其稳定性和成本是一个问题。在这个意义上，通过锂掺杂的表面改性方案首先通过简单的熔盐方法引入Sb 2S 3。熔融态的离子具有高迁移率和活性，使掺杂反应能够在短时间内完成。锂掺杂的Sb 2S 3薄膜具有光滑且结合良好的表面、择优（hk 1）取向和上移的价带最大值（VBM），这有利于空穴提取。最后，一种使用碳作为电极的器件，比黄金便宜十几倍，将短路电流密度（JSC）从12.35 mA cm-2提高到14.40 mA cm-2，功率转换效率（PCE）从4.47%提高到6.16%。这是报道的全无机Sb 2S 3太阳能电池的最高PCE之一，这证明了通过熔融碱金属盐进行界面改性以改善Sb 2S 3太阳能电池性能的简便技术。
Antimony sulfide (Sb2S3) is emerging as a promising light harvesting material owing to its brilliant photoelectric property. However, the performance of Sb2S3‐based solar cells is partly limited by serious back contact interface recombination and hole transportation resistance. High‐efficiency Sb2S3 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 Sb2S3 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 Sb2S3 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 (JSC) 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 Sb2S3 solar cells, which demonstrates a facile interface modification technique via molten alkali salt to improve the performance of Sb2S3 solar cells.