Due to distinctive lattice and electronic properties, the thiocyanate anion (SCN⁻) perovskite as an alluring two-dimensional (2D) material system, can be applied in optoelectronic devices. Herein, both photovoltaic and photodetection performances of the 2D Cs₂Pb(SCN)₂I₂ have been investigated. Compared with the conventional cationic 2D perovskites, Cs₂Pb(SCN)₂I₂ possesses ultra-small interlayer spacing, additional interlayer nano channels, which is thus beneficial for charge transport ability. The planar heterojunction solar cell based on Cs₂Pb(SCN)₂I₂ as the light absorber, has presented the highest power conversion efficiency among long-chain-cation-based 2D perovskite devices. Besides, the Cs₂Pb(SCN)₂I₂-based photodetector also exhibits much higher photodetection performance (i.e. quantum efficiency, on/off ratio, responsivity, detectivity, response speed, polarization sensitivity and detection stability). It is thus suggested that these outstanding photoelectric characteristics of Cs₂Pb(SCN)₂I₂ could bring huge opportunities for its more abundant optoelectronic applications, such as field-effect transistor and light-emitting diodes.

由于独特的晶格和电子性质，硫氰酸阴离子（SCN ^- ）钙钛矿作为一个诱人的二维（2D）材料系统中，可在光电子器件施加。在此，已经研究了2D Cs ₂ Pb（SCN）₂ I _2的光电性能和光电检测性能。与常规的阳离子2D钙钛矿相比，Cs ₂ Pb（SCN）₂ I ₂具有超小的层间间距和额外的层间纳米通道，因此有利于电荷传输能力。基于Cs ₂ Pb（SCN）₂ I ₂的平面异质结太阳能电池作为光吸收剂，在基于长链阳离子的2D钙钛矿设备中呈现出最高的功率转换效率。此外，基于Cs ₂ Pb（SCN）₂ I ₂的光电探测器还表现出更高的光电探测性能（即量子效率，开/关比，响应度，探测率，响应速度，极化灵敏度和探测稳定性）。因此表明，Cs ₂ Pb（SCN）₂ I _2的这些出色的光电特性可能为其更丰富的光电应用（如场效应晶体管和发光二极管）带来巨大机遇。