物理化学学报2023，Vol.39Issue(2)：71-80,10.DOI:10.3866/PKU.WHXB202203048
控制碘化铅形貌两步连续刮涂法大面积制备甲脒基钙钛矿薄膜
Two-Step Sequential Blade-Coating Large-Area FA-Based Perovskite Thin Film via a Controlled Pbl2 Microstructure
摘要
Abstract
Solar cells,which are excellent alternatives to traditional fossil fuels,can efficiently convert sunlight into electricity.The intensive development of high-performance photovoltaic materials plays an important role in environmental protection and the utilization of renewable energy.Organic-inorganic hybrid perovskite materials,with a formula of ABX3(A=methylammonium(MA)or formamidinium(FA);B=Pb or Sn;X=Cl,I,or Br),have exhibited remarkable commercial prospects in high-performance photovoltaic devices owing to their long carrier diffusion length,excellent light absorption properties,high charge carrier mobility,and weak exciton binding energy.Recently,perovskite solar cells,fabricated using halide perovskite materials as light-absorbing layers,have achieved remarkable results;their certified power conversion efficiency has continuously improved and reached 25.7％.However,high-performance devices are usually fabricated using spin-coating methods with active areas below 0.1 cm2.Hence,long-term research goals include achieving a large-scale uniform preparation of high-quality photoactive layers.The current one-step preparation of perovskite films involves the nucleation-crystalline growth process of perovskite.Auxiliary processes,such as using an anti-solvent,are often required to increase the nucleation rate and density of the film,which is not suitable for industrial large-area preparation.Additionally,the large-area preparation of perovskite films by spin-coating will result in different film thicknesses in the center and edge regions of the film due to an uneven centrifugal force.This will cause intense carrier recombination in the thicker area of the film and weak light absorption in the thinner area,which will reduce the performance of the device.To address these problems,the development of a large-area fabrication method for high-performance perovskite light-absorbing layers is essential.In this study,a two-step sequential blade-coating strategy was developed to prepare the FA-based perovskite layer.In general,Pbl2 easily forms a dense film;therefore,formamidinium iodide(FAI)cannot deeply penetrate to completely react with Pbl2.The Pbl2 residue is therefore detrimental to charge transportation.To fabricate the desired porous Pbl2 film,tetrahydrothiophene 1-oxide(THTO)was introduced into the Pbl2 precursor solution.By forming Pbl2-THTO complexes,Pbl2 crystallization is controlled,resulting in the formation of vertically packed Pbl2 flaky crystals.These crystals provide nanochannels for easy FAI penetration.The 5 cm×5 cm modules fabricated through this strategy achieved a high efficiency of 18.65％with excellent stability.This indicates that the two-step sequential blade-coating strategy has considerable potential for scaling up the production of perovskite solar cells.关键词
钙钛矿太阳能电池/两步法/刮涂/印刷/模组Key words
Perovskite solar cell/Two-step/Blade-coating/Printing/Module分类
化学化工引用本文复制引用
文永涛,李静,高晓峰,田聪聪,朱昊,余国木,张晓俐,Hyesung Park,黄福志..控制碘化铅形貌两步连续刮涂法大面积制备甲脒基钙钛矿薄膜[J].物理化学学报,2023,39(2):71-80,10.基金项目
The project was supported by the National Key Research and Development Plan(2019YFE0107200,2017YFE0131900),the National Natural Science Foundation of China(21875178,52172230,91963209),the Fundamental Research Funds for the Central Universities(WUT:202443004),and Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory(XDT2020-001,XHT2020-005).科技部重点研发计划(2019YFE0107200,2017YFE0131900),国家自然科学基金(21875178,52172230,91963209),中央高校基本科研业务费专项资金(WUT:202443004),先进能源科学与技术广东省实验室佛山分中心佛山仙湖实验室开放基金(XDT2020-001,XHT2020-005)资助项目 （2019YFE0107200,2017YFE0131900）
