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通过连接钙钛矿晶粒来构建高效稳定的钙钛矿太阳能电池。

Constructing Efficient and Stable Perovskite Solar Cells via Interconnecting Perovskite Grains.

机构信息

Engineering Research Center for Nanophotonics & Advanced Instrument, Ministry of Education, School of Physics and Materials Science and ‡Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University , Shanghai 200062, China.

出版信息

ACS Appl Mater Interfaces. 2017 Oct 11;9(40):35200-35208. doi: 10.1021/acsami.7b08488. Epub 2017 Sep 29.

Abstract

A high-quality perovskite film with interconnected perovskite grains was obtained by incorporating terephthalic acid (TPA) additive into the perovskite precursor solution. The presence of TPA changed the crystallization kinetics of the perovskite film and promoted lateral growth of grains in the vicinity of crystal boundaries. As a result, sheet-shaped perovskite was formed and covered onto the bottom grains, which made some adjacent grains partly merge together to form grains-interconnected perovskite film. Perovskite solar cells (PSCs) with TPA additive exhibited a power conversion efficiency (PCE) of 18.51% with less hysteresis, which is obviously higher than that of pristine cells (15.53%). PSCs without and with TPA additive retain 18 and 51% of the initial PCE value, respectively, aging for 35 days exposed to relative humidity 30% in air without encapsulation. Furthermore, MAPbI film with TPA additive shows superior thermal stability to the pristine one under 100 °C baking. The results indicate that the presence of TPA in perovskite film can greatly improve the performance of PSCs as well as their moisture resistance and thermal stability.

摘要

将对苯二甲酸(TPA)添加剂掺入钙钛矿前驱体溶液中,可获得具有互连钙钛矿晶粒的高质量钙钛矿薄膜。TPA 的存在改变了钙钛矿薄膜的结晶动力学,促进了晶界附近晶粒的横向生长。结果,形成了片状钙钛矿并覆盖在底部晶粒上,使一些相邻的晶粒部分合并在一起,形成晶粒互连的钙钛矿薄膜。具有 TPA 添加剂的钙钛矿太阳能电池(PSC)的功率转换效率(PCE)为 18.51%,滞后现象较小,明显高于原始电池(15.53%)。未添加和添加 TPA 的 PSC 在暴露于相对湿度为 30%的空气中 35 天后,分别保留初始 PCE 值的 18%和 51%,未封装。此外,在 100°C 烘烤下,添加 TPA 的 MAPbI 薄膜比原始薄膜具有更好的热稳定性。结果表明,钙钛矿薄膜中 TPA 的存在可以极大地提高 PSC 的性能以及其耐湿性和热稳定性。

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