Research Center for Applied Science, Academia Sinica , Taipei 115, Taiwan.
Department of Physics, National Taiwan University , Sec. 4, Roosevelt Road, Taipei 106, Taiwan.
ACS Appl Mater Interfaces. 2018 Jan 24;10(3):2566-2573. doi: 10.1021/acsami.7b16349. Epub 2018 Jan 11.
The presence of toxic lead (Pb) remains a major obstruction to the commercial application of perovskite solar cells. Although antimony (Sb)-based perovskite-like structures AMX can display potentially useful photovoltaic behavior, solution-processed Sb-based perovskite-like structures usually favor the dimer phase, which has poor photovoltaic properties. In this study, we prepared a layered polymorph of CsSbI through solution-processing and studied its photovoltaic properties. The exciton binding energy and exciton lifetime of the layer-form CsSbI were approximately 100 meV and 6 ns, respectively. The photovoltaic properties of the layered polymorph were superior to those of the dimer polymorph. A solar cell incorporating the layer-form CsSbI exhibited an open-circuit voltage of 0.72 V and a power conversion efficiency of 1.5%-the highest reported for an all-inorganic Sb-based perovskite.
有毒铅 (Pb) 的存在仍然是钙钛矿太阳能电池商业化应用的主要障碍。虽然基于锑 (Sb) 的类钙钛矿结构 AMX 可以显示出潜在有用的光伏行为，但溶液处理的 Sb 基类钙钛矿结构通常有利于二聚体相，其光伏性能较差。在这项研究中，我们通过溶液处理制备了层状 CsSbI，并研究了其光伏性能。层状 CsSbI 的激子结合能和激子寿命分别约为 100 meV 和 6 ns。层状多晶型物的光伏性能优于二聚体多晶型物。包含层状 CsSbI 的太阳能电池表现出 0.72 V 的开路电压和 1.5%的功率转换效率-这是报告的所有无机 Sb 基钙钛矿中的最高值。
