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

doi:10.1088/1674-1056/27/2/024208

Abstract 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 tune the structural, electrical, and optoelectronic properties of the light-harvesting materials for high-performance perovskite solar cells.

Keywords: organic-inorganic perovskitesolar cell morphology cation exchange drop-casting

Received: 08 July 2017
Revised: 03 November 2017
Published: 05 February 2018

PACS:	42.82.Gw	(Other integrated-optical elements and systems)
	42.88.+h	(Environmental and radiation effects on optical elements, devices, and systems)
	42.90.+m	(Other topics in optics)

Fund: Project supported by the Fundamental Research Funds for the Central Universities, China (Grant No. 2015QNA09).

Corresponding Authors: Ying-Huai Qiang
E-mail: yhqiang@cumt.edu.cn

About author: 42.82.Gw; 42.88.+h; 42.90.+m

Cite this article:

Yu-Long Zhao(赵宇龙), Jin-Feng Wang(王进峰), Ben-Guang Zhao(赵本广), Chen-Chen Jia(贾晨晨), Jun-Peng Mou(牟俊朋), Lei Zhu(朱磊), Jian Song(宋健), Xiu-Quan Gu(顾修全), Ying-Huai Qiang(强颖怀) Fabrication of mixed perovskite organic cation thin films via controllable cation exchange 2018 Chin. Phys. B 27 024208

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