Hybrid Perovskite Solar Cells

9Role of Grain Boundaries

Jae Sung Yun

University of New South Wales, School of Photovoltaic and Renewable Energy Engineering, Anzac Pde., Kensington, 2033, Australia

9.1 Introduction

The precipitation of solid material from liquid solution, so‐called “solution process,” is a typical process for obtaining high‐quality organic–inorganic halide perovskite (OIHP) films on a rigid or flexible substrate. The most conventionally used solution process is a spin‐coating process, which results in a polycrystalline thin film and a typical thickness is between 300 and 800 nm for OIHP‐based optoelectric devices. These films possess grains with distinct crystal orientations, thus, the formation of grain boundaries (GBs) is inevitable. Interestingly, despite ...