Two-dimensional (2D) halide perovskites have recently drawn significant interest due to their excellent optoelectronic and photoabsorption properties. Here, we present the large scale synthesis of solution-processed 2D (CH₃(CH₂)₃NH₃)₂(CH₃NH₃)_n − 1Pb_nI_3n + 1 (n = 2, 3, and 4) perovskites, a family of layered compounds with composition-tunable bandgap, where inkjet printing was used to fabricate heterostructure, flexible photodetector devices. The crystal structure for n = 2, 3, and 4 perovskite was measured using optical absorption spectroscopy, which showed the peak absorption at 563.8, 601.4, and 609.4 nm. The inkjet-printed photodetector devices (n = 2) were photoresponsive to broadband incoming radiation in the visible regime, where the photoresponsivity was calculated to be R ∼ 21 mA/W at a low light intensity of F ∼ 0.6 mW/cm². The flexible, inkjet-printed perovskite 2D heterostructures have significant potential for optoelectronic devices, which can enable broad possibilities with compositional tunability and versatility of the organohalide perovskites.

中文翻译：

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喷墨印刷二维钙钛矿光电器件的制造与表征

二维（2D）卤化物钙钛矿因其出色的光电和光吸收特性而引起了人们的极大兴趣。在这里，我们提出溶液处理的2D（CH ₃（CH ₂）₃ NH ₃）₂（CH ₃ NH ₃）_{n-  1} Pb _n I _{3 n  +1}（n  = 2、3和4 ）的大规模合成钙钛矿，一种层状化合物，带隙可调的层状化合物，使用喷墨印刷来制造异质结构，柔性光电探测器。n 的晶体结构使用光吸收光谱法测定了＝ 2、3和4的钙钛矿，其显示出在563.8、601.4和609.4nm处的峰吸收。喷墨印刷的光电检测器部件（Ñ  = 2）是光响应于宽带入射辐射在可见制度，其中，所述光响应被计算为[R 〜21毫安/ W在低光强度˚F  〜0.6毫瓦/厘米²。柔性，喷墨印刷的钙钛矿二维异质结构在光电器件方面具有巨大潜力，这可以使有机卤化物钙钛矿的成分可调性和多功能性成为可能。