Material Exchange Property of Organo Lead Halide Perovskite with Hole-Transporting Materials

Seigo Ito,Shusaku Kanaya,Hitoshi Nishino,Tomokazu Umeyama,Hiroshi Imahori

doi:10.3390/photonics2041043

Seigo Ito, Shusaku Kanaya + Show 3 more

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https://doi.org/10.3390/photonics2041043

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Journal: Photonics	Publication Date: Oct 2, 2015
Citations: 35	License type: CC BY 4.0

Affiliation: University of Hyogo, Osaka Gas (Japan), Kyoto University

Abstract

Using X-ray diffraction (XRD), it was confirmed that the deposition of hole-transporting materials (HTM) on a CH3NH3PbI3 perovskite layer changed the CH3NH3PbI3 perovskite crystal, which was due to the material exchanging phenomena between the CH3NH3PbI3 perovskite and HTM layers. The solvent for HTM also changed the perovskite crystal. In order to suppress the crystal change, doping by chloride ion, bromide ion and 5-aminovaleric acid was attempted. However, the doping was unable to stabilize the perovskite crystal against HTM deposition. It can be concluded that the CH3NH3PbI3 perovskite crystal is too soft and flexible to stabilize against HTM deposition.

Highlights

After the finding of the organo lead halide perovskite solar cell by the groups of Miyasaka, Snaith, Park and Grätzel [1,2,3,4], it has received significant attention in the last five years with improvement of the conversion efficiency from 3% [1] to a certified value of 20.1% [5]
The solvent-rinsing effect on CH3NH3PbI3 perovskite crystal variation was considered before the hole-transporting material (HTM) deposition itself
The intensity of X-ray diffraction (XRD) counts was related to the measurement setup, the height between the samples can be compared to discuss the variation of crystal structures using the same system consistently

Summary

Introduction

After the finding of the organo lead halide perovskite solar cell by the groups of Miyasaka, Snaith, Park and Grätzel [1,2,3,4], it has received significant attention in the last five years with improvement of the conversion efficiency from 3% [1] to a certified value of 20.1% [5]. Printed devices should be deposited on a hard-soluble material to an easy-soluble one. Otherwise, the former material can be dissoluble into the latter one. In order to improve the conversion efficiency of perovskite solar cells, this phenomena is a critical issue

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