Fabrication of mixed perovskite organic cation thin films via controllable cation exchange

• 来源期刊: 中国物理B（英文版）
• 关键词: organic-inorganic perovskitesolar cell morphology cation exchange drop-casting
• 年，卷（期）: 2018,（2）
• 页码范围: 385-392
• 页数: 8页
• 语种: 英文
• DOI: 10.1088/1674-1056/27/2/024208

摘要

Here in this paper,we demonstrate a facile technique for creating the mixed formamidinium (HN =CHNH3+,FA+) and methylammonium (CH3NH3+,MA+) cations in the lead iodide perovskite.This technique entails a facile drop-casting of formamidinium iodide (FAI) solutions on as-prepared MAPbI3 perovskite thin films under the controlled conditions,which leads to controllable displacement of the MA+ cations by FA+ cations in the perovskite structure at room temperature.Uniform and controllable mixed organic cation perovskite thin films without a "bi-layered" or graded structure are achieved.By applying this approach to photovoltaic devices,we are able to improve the performances of devices through extending their optical-absorption onset further into the infrared region to enhance solar-light harvesting.Additionally,this work provides a simple and efficient technique to rune the structual,electrical,and optoelectronic properties of the light-harvesting materials for high-performance perovskite solar cells.