Surface Dynamics Transition of Vacuum Vapor Deposited CH3NH3PbI3 Perovskite Thin Films

Yunyan Liu,Gongxiang Wei,Dong Zhao,Meiling Sun,Hongsheng Song,Fangming Jin,Junshan Xiu,Zisheng Su

doi:10.1155/2018/8297918

Abstract

The growth dynamics of CH3NH3PbI3 perovskite thin films on ITO covered glass substrate were investigated. The evolution of the film could be divided into two stages. A mound-like surface was obvious at the first stage. Stable dynamic scaling was observed for thicker films at the second stage. Through analyzing the scaling exponent, growth exponent β, and 2D fast Fourier transform, it is concluded that, at the second stage, the growth mechanism of mound formation does not play a major role, and the film growth mechanism can be described by Mullins diffusion equation.

Highlights

In the past few years, organic–inorganic halide perovskites materials have been intensively investigated for their excellent combination of optoelectronic properties and low cost
For inorganic and organic thin films, scaling concepts have been developed to quantify the statistical properties of the morphology evolution of the growth front in order to study the growth dynamics of thin films
We have reported the scaling behavior and related physical growth dynamics of morphology evolution and growth kinetics of CH3NH3PbI3 (MAPbI3) perovskite thin films on smooth Si substrates [11]

Summary

Introduction

In the past few years, organic–inorganic halide perovskites materials have been intensively investigated for their excellent combination of optoelectronic properties and low cost. There is still limited knowledge of the morphology evolution and basic growth dynamics of the halide perovskite thin films. For inorganic and organic thin films, scaling concepts have been developed to quantify the statistical properties of the morphology evolution of the growth front in order to study the growth dynamics of thin films. Various surface growth mechanisms have been supported by different growth models with different sets of scaling exponents [10]. Within this framework, the growth-induced surface morphology information is described by the equal-time height-height correlation function H(r, t).

Methods

Results

Conclusion