A Bi2Te3 Topological Insulator as a New and Outstanding Counter Electrode Material for High-Efficiency and Endurable Flexible Perovskite Solar Cells.
A Bi2Te3 Topological Insulator as a New and Outstanding Counter Electrode Material for High-Efficiency and Endurable Flexible Perovskite Solar Cells.
复制标题
Bi2Te3拓扑绝缘体作为高效、耐用的柔性钙钛矿太阳能电池的新型、出色的对电极材料。
DOI：
10.1021/acsami.9b15320
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Luo Wei
中科院分区：
文献类型：
--
作者：
Wang Mei;Fu Qiuyun;Yan Liang;Pi Wenbo;Wang Geng;Zheng Zhiping;Luo Wei
倒置柔性钙钛矿太阳能电池（PSC）通常采用昂贵的金属作为对电极，其是脆性的并且可被钙钛矿腐蚀，导致在连续弯曲、空气暴露、热应力或光照下性能急剧下降，并最终阻碍商业化。在此，通过使用简单的热蒸发工艺采用低成本的Bi2Te3对电极。所得器件实现了18.16%的优异的功率转换效率，这是最高的报道效率之一，远高于参考Ag PSC（15.90%）。这种改善应归因于Bi_2Te_3拓扑绝缘体中本征抑制的电子背散射。同时，Bi2Te3器件获得了显著改善的机械柔性和长期运行稳定性。目前的战略将有助于为灵活光伏应用的未来商业化开辟新的途径。
Inverted flexible perovskite solar cells (PSCs) typically employ expensive metals as the counter electrodes, which are brittle and corrodible by perovskite, leading to a sharp performance drop under continuous bending, air exposure, thermal stress, or light illumination and eventually retard the commercialization. Herein, a low-cost Bi2Te3counter electrode was employed by using a simple thermal evaporation process. The resultant device achieved an excellent power conversion efficiency of 18.16%, which was among the highest reported efficiencies, much higher than the reference Ag PSC (15.90%). The improvement should be attributed to the intrinsic suppressed electron backscattering in a Bi2Te3topological insulator. Simultaneously, the Bi2Te3device obtained a significantly improved mechanical flexibility and long-term operational stability. The present strategy will help to open up a new avenue for future commercialization of flexible photovoltaic applications.