Two-dimensional (2D) layered perovskites have garnered significant research interest within the perovskite community due to their potential as semiconducting materials characterized by high structural stability and favorable optoelectrical properties. Among various contenders, 2D Dion–Jacobson (DJ) perovskites featuring diammonium organic spacers stand out for their exceptional stability. This stability is attributed to the robust hydrogen bonding of the spacer, which leads to a shorter distance between the inorganic octahedral cage layers. In this study, we highlight the remarkable structural stability of 2D DJ perovskite in Sn²⁺ perovskite thin-film transistors, achieved through the incorporation of 3-(aminomethyl)piperidinium tin iodide (3AMPSnI₄) and 4-(aminomethyl)piperidinium tin iodide (4AMPSnI₄). The varying positions of the aminomethyl group determine the distortion of the crystal lattice, impacting their respective optical and electrical properties. The relatively low distortion 3AMPSnI₄ demonstrates transistor performance with a 10-fold increase in field-effect mobility and 2 orders of magnitude improvement in the on/off current ratio through high film quality with grain size exceeding 10 μm and narrower bandgap. Moreover, the stability of both the film and device under ambient air exposure is markedly improved, with 2D DJ perovskites retaining their crystal structure for over 24 h, presenting a notable enhancement compared to 2D Ruddlesden–Popper perovskites.

中文翻译：

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具有增强环境稳定性的二维 Dion-Jacobson 锡钙钛矿晶体管

二维（2D）层状钙钛矿因其作为具有高结构稳定性和良好光电特性的半导体材料的潜力而在钙钛矿界引起了广泛的研究兴趣。在众多竞争者中，具有二铵有机间隔物的二维迪翁-雅各布森（DJ）钙钛矿因其卓越的稳定性而脱颖而出。这种稳定性归因于间隔基的牢固氢键，这导致无机八面体笼层之间的距离更短。在这项研究中，我们强调了Sn ²⁺钙钛矿薄膜晶体管中2D DJ钙钛矿的卓越结构稳定性，这是通过掺入3-(氨甲基)哌啶碘化锡(3AMPSnI ₄ )和4-(氨甲基)哌啶碘化锡实现的。 (4AMPSnI ₄ )。氨甲基的不同位置决定了晶格的变形，影响它们各自的光学和电学性能。畸变相对较低的 3AMPSnI ₄展现了晶体管性能，通过晶粒尺寸超过 10 μm 的高薄膜质量和更窄的带隙，场效应迁移率提高了 10 倍，开/关电流比提高了 2 个数量级。此外，薄膜和器件在环境空气暴露下的稳定性显着提高，2D DJ 钙钛矿在超过 24 小时内保持其晶体结构，与 2D Ruddlesden-Popper 钙钛矿相比，表现出显着的增强。