Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States.
Department of Physics and Astronomy and Wright Center for Photovoltaics Innovation and Commercialization, The University of Toledo , Toledo, Ohio 43606, United States.
J Am Chem Soc. 2016 Nov 16;138(45):14998-15003. doi: 10.1021/jacs.6b08790. Epub 2016 Nov 8.
Achieving high open-circuit voltage (V) for tin-based perovskite solar cells is challenging. Here, we demonstrate that a ZnS interfacial layer can improve the V and photovoltaic performance of formamidinium tin iodide (FASnI) perovskite solar cells. The TiO-ZnS electron transporting layer (ETL) with cascade conduction band structure can effectively reduce the interfacial charge recombination and facilitate electron transfer. Our best-performing FASnI perovskite solar cell using the cascaded TiO-ZnS ETL has achieved a power conversion efficiency of 5.27%, with a higher V of 0.380 V, a short-circuit current density of 23.09 mA cm, and a fill factor of 60.01%. The cascade structure is further validated with a TiO-CdS ETL. Our results suggest a new approach for further improving the performance of tin-based perovskite solar cells with a higher V.
实现锡基钙钛矿太阳能电池的高开路电压 (V) 具有挑战性。在这里，我们证明了 ZnS 界面层可以提高甲脒碘化锡 (FASnI) 钙钛矿太阳能电池的 V 和光伏性能。具有级联导带结构的 TiO-ZnS 电子传输层 (ETL) 可以有效降低界面电荷复合并促进电子转移。我们使用级联 TiO-ZnS ETL 的性能最佳的 FASnI 钙钛矿太阳能电池实现了 5.27%的功率转换效率，具有更高的 V 值 0.380 V、23.09 mA cm 的短路电流密度和 60.01%的填充因子。级联结构进一步通过 TiO-CdS ETL 得到验证。我们的结果表明，通过提高 V 值，进一步提高锡基钙钛矿太阳能电池性能的新方法。
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