Chen Yunfeng, Tan Congwei, Wang Zhen, Miao Jinshui, Ge Xun, Zhao Tiange, Liao Kecai, Ge Haonan, Wang Yang, Wang Fang, Zhou Yi, Wang Peng, Zhou Xiaohao, Shan Chongxin, Peng Hailin, Hu Weida
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Adv. 2022 Jul 29;8(30):eabq1781. doi: 10.1126/sciadv.abq1781.
Two-dimensional (2D) infrared photodetectors always suffer from low quantum efficiency (QE) because of the limited atomically thin absorption. Here, we reported 2D black phosphorus (BP)/BiOSe van der Waals (vdW) photodetectors with momentum-matching and band-alignment heterostructures to achieve high QE. The QE was largely improved by optimizing the generation, suppressing the recombination, and improving the collection of photocarriers. Note that momentum-matching BP/BiOSe heterostructures in -space lead to the highly efficient generation and transition of photocarriers. The recombination process can be largely suppressed by lattice mismatching-immune vdW interfaces. Furthermore, type II BP/BiOSe vdW heterostructures could also assist fast transport and collection of photocarriers. By constructing momentum-matching and band-alignment heterostructures, a record-high QE of 84% at 1.3 micrometers and 76.5% at 2 micrometers have been achieved in BP/BiOSe vdW photodetectors.
二维（2D）红外光电探测器由于原子级薄吸收有限，量子效率（QE）一直较低。在此，我们报道了具有动量匹配和能带对齐异质结构的二维黑磷（BP）/BiOSe范德华（vdW）光电探测器，以实现高量子效率。通过优化光生载流子的产生、抑制复合以及改善收集，量子效率得到了大幅提高。需要注意的是，-空间中的动量匹配BP/BiOSe异质结构导致光生载流子的高效产生和跃迁。晶格失配免疫的vdW界面可大幅抑制复合过程。此外，II型BP/BiOSe vdW异质结构还可协助光生载流子的快速传输和收集。通过构建动量匹配和能带对齐异质结构，BP/BiOSe vdW光电探测器在1.3微米处实现了创纪录的84%的高量子效率，在2微米处实现了76.5%的量子效率。
