Silver (Ag) and graphene (Gr) inks have been engineered to serve as efficient electrical contacts for solution-processed two-dimensional (2D) organo-halide (CH₃(CH₂)₃NH₃)₂(CH₃NH₃)_n−1Pb_nI_3n+1 (n = 4) layered perovskites, where all inkjet-printed heterostructure photodetectors (PDs) were fabricated on polyimide (PI) substrates. To date, limited studies exist that compare multiple contacts to enable high-performance engineered contacts to 2D perovskites. Moreover, of these few reports, such studies have examined contacts deposited using vapor-based techniques that are time-consuming and require expensive, specialized deposition equipment. In this work, we report on the inkjet printed, direct contact study of solution-processed, 2D perovskite-based PDs formed on flexible PI substrates. Solution processing offers a cost-effective, expedient route for inkjet printing Gr and Ag using a dispersion chemistry developed in this work that is compatible with the underlying 2D perovskite layer to construct the PDs. The wavelength λ-dependent photocurrent I_p peaked at λ ~ 630 nm for both PDs, consistent with the bandgap E_g ~ 1.96 eV for our semiconducting 2D perovskite absorber layer. The external quantum efficiency was determined to be 103% for Ag-perovskite PDs, where strain-dependent bending tests were also conducted to reveal the opto-mechanical modulation of the photocurrent in our devices.

银（Ag）和石墨烯（Gr）墨水经过精心设计，可以用作溶液处理的二维（2D）二维有机卤化物（CH ₃（CH ₂）₃ NH ₃）₂（CH ₃ NH ₃）的有效电触点。_{n -1} Pb _n I _{3 n +1}（n = 4）层状钙钛矿，其中所有喷墨印刷的异质结构光电探测器（PD）均在聚酰亚胺（PI）基板上制造。迄今为止，存在有限的研究，它们比较了多个接触点以使高性能工程接触点与2D钙钛矿相关。此外，在这几份报告中，此类研究已经检查了使用基于蒸汽的技术沉积的触点，这些技术既费时又需要昂贵的专用沉积设备。在这项工作中，我们报告了在柔性PI基板上进行溶液加工的基于2D钙钛矿的PD的喷墨印刷直接接触研究。溶液处理使用这项工作中开发的与下面的2D钙钛矿层兼容以构造PD的分散化学，为Gr和Ag的喷墨印刷提供了一种经济高效的便捷途径。波长λ依赖性光电流我_p峰值在λ  〜630nm处为两个的PD，具有带隙一致ë_克 〜1.96电子伏特为我们的半导体2D钙钛矿吸收层。Ag-钙钛矿PD的外部量子效率确定为103％，还进行了应变相关的弯曲测试以揭示我们设备中光电流的光机械调制。