The synthesis of certain perovskite single crystals (SCs), including CH₃NH₃PbI₃, through asymmetric crystallization is difficult, mainly because of the large difference in solubility of the precursors and/or the intrinsic nonpreference for growth in a direction along the substrate. Herein, an effective method is reported, seeded space‐limited inverse‐temperature crystallization (SSLITC), for growing CH₃NH₃PbI₃ SC plates having micrometer‐scale diameters. In this process, a seed CH₃NH₃PbI₃ crystal is incorporated within a confined space to promote crystallization. Crystal plates having lateral dimensions of up to 2 mm are grown successfully. These SCs and a polymer conductive glue to fabricate perovskite solar cells on flexible substrates are used. One such device exhibits a maximum external quantum efficiency of 96%, a high photocurrent of 22 mA cm⁻², and a power conversion efficiency of greater than 4%. In addition, a device prepared without any encapsulation exhibits reasonable stability, suggesting a promising future for SC‐based perovskite solar cells. It is anticipated that the SSLITC method proposed herein could open up new avenues for synthesizing various types of organic/inorganic perovskite SCs for applications in modern electronics.

中文翻译：

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钙钛矿型太阳能电池CH3NH3PbI3单晶板的晶种有限晶种

通过不对称结晶合成某些钙钛矿单晶（SCs）（包括CH ₃ NH ₃ PbI _3）是困难的，这主要是因为前体的溶解度差异大和/或固有的不偏好沿衬底方向生长。本文报道了一种有效的方法，即种子空间有限的逆温结晶（SSLITC），用于生长具有微米级直径的CH ₃ NH ₃ PbI ₃ SC板。在此过程中，种子为CH ₃ NH ₃ PbI ₃晶体结合在有限的空间内以促进结晶。可以成功生长出横向尺寸最大为2 mm的晶体板。使用这些SC和聚合物导电胶在柔性基板上制造钙钛矿型太阳能电池。一种这样的器件表现出96％的最大外部量子效率，22mA cm ^-2的高光电流以及大于4％的功率转换效率。此外，制备的没有任何封装的器件表现出合理的稳定性，这表明基于SC的钙钛矿太阳能电池的前景广阔。可以预期，本文提出的SSLITC方法可以开辟新途径，以合成用于现代电子中的各种类型的有机/无机钙钛矿SC。