摘要
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.
硫氰酸根阴离子(SCN)钙钛矿材料由于拥有独特的晶格和电子性能使其成为光电应用中诱人的二维(2D)材料系统.由此,我们研究了2D结构Cs2Pb(SCN)2I2材料的光伏和光电探测性能.与常规的阳离子2D钙钛矿材料相比,Cs2Pb(SCN)2I2具有极小的层间间距和额外的层间纳米通道,从而大大提高了电荷传输能力.对比所有基于长链阳离子的单纯2D钙钛矿器件,以Cs2Pb(SCN)2I2作为光吸收层的平面异质结太阳能电池表现出最高的光电转换效率.此外,基于Cs2Pb(SCN)2I2的光电探测器表现出更高的光电探测EQE、开/关比、响应度、探测率、响应速度、偏振灵敏度以及更优异的光电稳定性.所有这些出色的光电特性为SCN钙钛矿材料在更丰富的光电应用领域(例如:场效应晶体管和发光二极管等)提供了巨大机遇.
作者
Yiming Li
Jiangjian Shi
Huijue Wu
Yanhong Luo
Dongmei Li
Qingbo Meng
李一明;石将建;吴会觉;罗艳红;李冬梅;孟庆波(Key Laboratory for Renewable Energy,Chinese Academy of Sciences,Beijing Key Laboratory for New Energy Materials and Devices,Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,100049,China;School of Physics Science,University of Chinese Academy of Sciences,Beijing,100049,China;Songshan Lake Materials Laboratory,Dongguan,523808,China)
基金
supported by the National Key R&D Program of China(2018YFB1500101)
the National Natural Science Foundation of China(11874402,51421002,51627803,91733301 and 51761145042)
the International Partnership Program of Chinese Academy of Sciences(112111KYSB20170089)。
