High‐Quality Hybrid Perovskite Thin Films by Post‐Treatment Technologies in Photovoltaic Applications

Abstract

Incredible progress in photovoltaic devices based on hybrid perovskite materials has been made in the past few decades, and a record‐certified power conversion efficiency (PCE) of over 26% has been achieved in single‐junction perovskite solar cells (PSCs). In the fabrication of high‐efficiency PSCs, the postprocessing procedures toward perovskites are essential for designing high‐quality perovskite thin films; developing efficient and reliable post‐treatment techniques is very important to promote the progress of PSCs. Here, recent post‐treatment technological reforms toward perovskite thin films are summarized, and the principal functions of the post‐treatment strategies on the design of high‐quality perovskite films have been thoroughly analyzed by dividing into two categories in this review: thermal annealing (TA)‐related technique and TA‐free technique. The latest research progress of the above two types of post‐treatment techniques is summarized and discussed, focusing on the optimization of postprocessing conditions, the regulation of perovskite qualities, and the enhancement of device performance. Finally, an outlook of the prospect trends and future challenges for the fabrication of the perovskite layer and the production of highly efficient PSCs is given.

Cyclodextrin-assisted supramolecular host-guest inclusion for durable and sustainable optoelectronics

“…For example, uracil was introduced to manipulate the film growth by Wang et al [3] . Though effective and promising, one can still expect the potential shortcomings such as limited chemical interaction sites, insufficient surface protection [4] and extra processing steps [5] , not to mention their inferior capability of reducing lead leakage. Specifically, the limited chemical interaction sites would result in limited passivation efficacy of crystallographic imperfections and limited ion immobilization effect.…”

MAPbCl3 Light Absorber for Highest Voltage Perovskite Solar Cells

“…17 However, post-annealing treatments of asdeposited films has been used as an alternative approach to improve the crystallization and healing of defective perovskite films. 20 Among other efficient crystallization methods, annealing under various atmospheres has been proven to be effective in reducing non-radiative recombination. 21 However, no such strategies have been employed for MAPbCl 3 films yet.…”

“…This is the underlying reason that a two-step deposition process comprising PbCl 2 film dipping in a MACl solution was introduced as an efficient approach for better crystallization of MAPbCl 3 films with more flexibility in dissolving the precursor components . However, post-annealing treatments of as-deposited films has been used as an alternative approach to improve the crystallization and healing of defective perovskite films . Among other efficient crystallization methods, annealing under various atmospheres has been proven to be effective in reducing non-radiative recombination .…”