Crystallization orientation and the buried interface have been proven to be key factors determining the efficiency of perovskite solar cells (PSCs). Here, we report a facile strategy to concomitantly induce (100)-oriented perovskite and improve buried interface by incorporating a bifunctional ligand 2-(methylthio) ethylamine hydrochloride (METEAM) into perovskite precursor solution. METEAM molecules preferentially adsorb on (100) facets of perovskite via strong interactions with perovskite lattice to induce oriented perovskite crystallization. Meanwhile, METEAM molecules spontaneously aggregate at the buried interface and operate as a bridge between the perovskite and tin oxide (SnO₂) electron transport layer to bidirectionally passivate their defects. As-prepared perovskite films exhibit suitable energy level and high mobility for interfacial charge transfer, low trap state density, and long carrier lifetime. The resultant conventional-structure PSC devices deliver a power conversion efficiency (PCE) of 26.1% (certified 25.8%) with improved operational and ambient stabilities, which is among the highest PCE of conventional PSCs.

中文翻译：

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双功能配体诱导的优选晶体取向可实现高效的钙钛矿太阳能电池


结晶取向和埋地界面已被证明是决定钙钛矿太阳能电池 （PSC） 效率的关键因素。在这里，我们报道了一种简单的策略，通过将双功能配体 2-（甲硫基）乙胺盐酸盐 （METEAM） 掺入钙钛矿前驱体溶液中，同时诱导 （100） 导向的钙钛矿并改善埋藏界面。METEAM 分子通过与钙钛矿晶格的强烈相互作用优先吸附在钙钛矿的 （100） 个面上，以诱导定向钙钛矿结晶。同时，METEAM 分子在埋藏界面自发聚集，并作为钙钛矿和氧化锡 （SnO₂） 电子传输层之间的桥梁，双向钝化它们的缺陷。制备的钙钛矿薄膜表现出合适的能级和高流动性，适用于界面电荷转移、低陷阱态密度和较长的载流子寿命。由此产生的传统结构 PSC 器件可提供 26.1% 的功率转换效率 （PCE）（认证 25.8%），并改善了操作和环境稳定性，这是传统 PSC 中最高的 PCE 之一。