Author: Bi, Tao
Title: Air-knife assisted thin film formation for high performance large area perovskite solar cells
Advisors: Li, Gang (EIE)
Degree: M.Sc.
Year: 2020
Subject: Thin films
Solar cells
Perovskite solar cells
Hong Kong Polytechnic University -- Dissertations
Department: Department of Electronic and Information Engineering
Pages: v, 33 pages : color illustrations
Language: English
Abstract: In the last decade, perovskites, a material system that has a typical crystal structure of ABX3 formula, showed up its great potential in optical and electrical properties and was widely used to fabricate solar cells in the laboratory research. As the highest power conversion efficiency (PCE) of perovskite solar cells (PSCs) has already reached 25% in recent years, it is inspiring a new wave of research by several unique advantages against traditional silicon solar cells. However, the most reliable way to fabricate PSCs is the spin coating method, which, as a matter fact, is commonly used in the laboratory research but not suitable for large area PSCs fabrication, especially for industrial manufacturing. Based on this situation, the blade coating method shows its great potential for industrialization as the device coating scale can vary with the width of the doctor blade. However, the blade coating technique possess its shortage, it is difficult to control the crystallization kinetics during the perovskite film fabrication. The traditional blade coating method requires the air quenching method of the perovskite precursor film after the blading coating. Although the device size will not be limited by the coating process, it will be limited by the normal air quenching process using a small tube. In this manuscript, a manufactural friendly technique, super air-knife gas quenching, was adopted to assist perovskite film formation by utilizing the blade coating method, delivering high performance large PSCs. Furthermore, the impact of different air-knife blowing angle on the crystallization kinetics of perovskite films was systematically investigated. For a comparison experiment, spin-coating method associated with antisolvent technique and commonly used blade coating method equipped with roundtable tube air quencher were introduced. We check the electrical performance of PSCs fabricated by different film formation techniques. Best PCE can be achieved by blade coating method equipped with Air-knife with the blowing angle of 30°±5°. Moreover, we systematically study the influence of air-knife blowing angle on the device performance as well as the corresponding device stability and reproducibility. With the aim of manufactural friendly and antisolvent free, as well as the industrial large area device fabrication achievable, this manuscript offers an efficient way to figure out the optimal processing condition of high-quality perovskite film formation by introducing air-knife assisted blade coating technique, demonstrating a maximum PCE of 20.3% for 0.06 cm² and 17.3% for 1 cm².
Rights: All rights reserved
Access: restricted access

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