溶液法制备二维钙钛矿层提高甲脒碘化铅钙钛矿太阳能电池稳定性  

Preparation of two-dimensional perovskite layer by solution method for improving stability of FAPbI3 perovskite solar cells

作　　者：刘思雯 任立志 金博文 宋欣 吴聪聪 Liu Si-Wen;Ren Li-Zhi;Jin Bo-Wen;Song Xin;Wu Cong-Cong(School of Materials Science and Engineering,Hubei University,Wuhan 430062,China)

机构地区：[1]湖北大学材料科学与工程学院,武汉430062

出　　处：《物理学报》2024年第6期386-395,共10页Acta Physica Sinica

基　　金：湖北省重点研发计划(批准号:2022BAA096);国家自然科学基金(批准号:62004064)资助的课题。

摘　　要：有机-无机金属卤化物钙钛矿太阳能电池(PSCs)因优异的光电转换性能被广泛研究,但CH(NH_(2))_(2)PbI_(3)(FAPbI_(3))固有的化学不稳定性阻碍了其长期以来的发展.特别是薄膜表界面处因更低的活化能而具有突出的湿度敏感性,表界面的缺陷与薄膜稳定性具有强相关性,缺陷的处理结果是提高长期稳定性的关键因素之一.除了界面工程,还有在表面叠加二维钙钛矿层的策略用于界面钝化.然而二维钙钛矿层的制备方法多数具有局限性.本文采用全溶液法的制备工艺,通过在FAPbI_(3)钙钛矿表面均匀涂覆丁基碘化铵(BAI)溶液与热退火的后处理方式,驱动了表面二维(2D)钙钛矿的形成,以减少薄膜表界面缺陷,成功制备了混合维钙钛矿太阳能电池.与此同时,2D钙钛矿中长链分子的疏水性本质上提高了钙钛矿层对水分的容忍度.结果表明,含2D钙钛矿层的未封装器件在相对湿度(RH)为60%的室温环境空气中连续工作近1000 h后仍保持初始效率的80%以上.这种方法构建的2D钙钛矿层在不影响载流子传输性能的同时显著提高了薄膜与器件的长期稳定性,符合高质量钙钛矿太阳能电池的要求与发展趋势,是一种极具发展潜力的策略.Organic-inorganic metal halide perovskite solar cells(PSCs)have been widely studied due to their excellent photoelectric conversion performance,but the inherent chemical instability of CH(NH_(2))_(2)PbI_(3)(FAPbI_(3))hinders its sustainable development.In particular,the surface interface of the membrane has prominent humidity sensitivity due to lower activation energy,the defect of the surface interface has a strong correlation with the film stability,and the treatment result of the defect is one of the key factors to improve the long-term stability.The FAPbI_(3)suffers phase transition from black perovskite phase to yellow non-perovskite phase at room temperature,and the moisture will accelerate this phase transition.Interface engineering is one of the common methods to improve the stability of perovskite solar cells.In addition to interface engineering,there is a strategy of stacking a two-dimensional(2D)perovskite layer on the surface for interface passivation.However,most of the preparation methods of 2D perovskite layer have limitations.In this work,the full solution method and post-treatment mode of annealing are adopted,the hybrid perovskite solar cells of vitamin perovskite are successfully fabricated.The FAPbI_(3)perovskite surface is uniformly spin-coated with butylamine iodide(BAI)solution,and the formation of 2D perovskite is driven on the surface of FAPbI_(3)perovskite.Due to the passivation of surface interface defects by the 2D perovskite layer,the non-radiative recombination of charge carriers is reduced,greatly improving the carrier lifetime.Because of the hydrophobicity of long chain molecules in 2D perovskite,the long-term stability of the device is significantly improved.Consequently,the unencapsulated device containing 2D perovskite layer remains above 80%after operating at room temperature in ambient air with a relative humidity(RH)of 60%for nearly 1000 hours.The 2D perovskite layer can significantly improve the long-term stability of the film without affecting the charge carrier transport p

关 键 词：钙钛矿太阳能电池 二维钙钛矿 界面钝化 稳定性 

分 类 号：TM914.4[电气工程—电力电子与电力传动]