Ionic Liquid Assisted Imprint for Efficient and Stable Quasi-2D Perovskite Solar Cells with Controlled Phase Distribution

Although two-dimensional perovskite devices are highly stable,they also lead to a number of challenges.For instance,the introduction of large organic amines makes crystallization process complicated,causing problems such as generally small grain size and blocked charge transfer.In this work,imprint assisted with methylamine acetate were used to improve the morphology of the film,optimize the internal phase distribution,and enhance the charge transfer of the perovskite film.Specifically,imprint promoted the dispersion of spacer cations in the recrystallization process with the assistance of methylamine acetate,thus inhibited the formation of low-n phase induced by the aggregation of spacer cations and facilitated the formation of 3D-like phase.In this case,the corresponding quasi-2D perovskite solar cells delivered improved efficiency and exhibited superior stability.Our work provides an effective strategy to obtain uniform phase distribution for quasi-2D perovskite.

Multifunctional ionic liquid to extend the expiration date of precursor solution for perovskite photovoltaics

At present,the development of perovskite solar cells(PSCs)is progressing rapidly,but the issue of poor stability remains a significant challenge.Achieving a stable precursor solution is crucial for the large-scale production of high-quality PSC films.In this study,we successfully developed a strategy to improve the long-term stability of the precursor solution and improve device performance by employing 1-n-butyl-3-methylimidazolium di-n-butyl phosphate(BMIMBP)as an anti-aging additive.The BP−component inhibits the reactivity of I−and formamidinium ion through multiple chemical bonds,thereby stabilizing the precursor solution.In addition,the BMIM+component,which contains an amino group,can form two-dimensional perovskite internally,further enhancing the device stability.This strategy provides valuable guidance for achieving long-term stability in solar cells.

通过晶格加固实现多环境下相稳定的高效钙钛矿太阳电池

富甲脒体系的钙钛矿太阳电池(PSCs)由于出色的热稳定性和较宽的光谱吸收范围,在商业应用中显示出竞争力.然而,富甲脒体系的PSCs会受到残余应力的极大影响,出现晶格过度扭曲并诱发不利的相变.本文通过构建一系列的晶格加固结构,验证了有机间隔阳离子和无机八面体之间的差异性相互作用.通过探索α相到γ相以及δ相的转变过程,揭示了残余应力释放和晶格加固之间的关系及其重要性.最后,苯甲基胺修饰的器件展现出最高22.90%的光电转换效率(PCE),并抑制了多路径相变.在空气中放置1000小时后,初始性能仍能维持初始值的90%.此外,在25平方厘米的衬底上制备了PCE为17.10%的迷你模组,验证了大面积制备的可行性.