Yang Bin, Li Ya-Juan, Tang Yu-Xuan, Mao Xin, Luo Cheng, Wang Mei-Shan, Deng Wei-Qiao, Han Ke-Li
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics (DICP) , Chinese Academy of Sciences , 457 Zhongshan Road , Dalian , Liaoning 116023 , China.
University of the Chinese Academy of Sciences , Beijing 10049 , China.
J Phys Chem Lett. 2018 Jun 7;9(11):3087-3092. doi: 10.1021/acs.jpclett.8b01116. Epub 2018 May 24.
We developed a high-performance photodetector based on (CHNH)SbI (MASbI) microsingle crystals (MSCs). The MASbI single crystals exhibit a low-trap state density of ∼10 cm and a long carrier diffusion length reaching 3.0 μm, suggesting its great potential for optoelectronic applications. However, the centimeter single crystal (CSC)-based photodetector exhibits low responsivity (10 A/W under 1 sun illumination) due to low charge-carrier collection efficiency. By constructing the MSC photodetector with efficient charge-carrier collection, the responsivity can be improved by three orders of magnitude (under 1 sun illumination) and reach 40 A/W with monochromatic light (460 nm). Furthermore, the MSC photodetectors exhibit fast response speed of <1 ms, resulting in a high gain of 108 and a gain-bandwidth product of 10 Hz. These numbers are comparable to the lead-perovskite single-crystal-based photodetectors.
我们基于(CHNH)SbI（MASbI）微单晶（MSCs）开发了一种高性能光电探测器。MASbI单晶表现出约10 cm的低陷阱态密度和长达3.0μm的长载流子扩散长度，表明其在光电子应用方面具有巨大潜力。然而，基于厘米级单晶（CSC）的光电探测器由于电荷载流子收集效率低而表现出低响应度（在1个太阳光照下为10 A/W）。通过构建具有高效电荷载流子收集的MSC光电探测器，响应度可以提高三个数量级（在1个太阳光照下），并且在单色光（460 nm）下达到40 A/W。此外，MSC光电探测器表现出<1 ms的快速响应速度，导致高达108的高增益和10 Hz的增益带宽积。这些数值与基于铅基钙钛矿单晶的光电探测器相当。
