Momentum-matching and band-alignment van der Waals heterostructures for high-efficiency infrared photodetection

• DOI: 10.1126/sciadv.abq1781
• Publication Date: 2022-07-29T17:58:43Z
• Authors: Yunfeng Chen; Congwei Tan; Zhen Wang; Jinshui Miao; Xun Ge; Tiange Zhao; Kecai Liao; Haonan Ge; Yang Wang; Fang Wang; Yi Zhou; Peng Wang; Xiaohao Zhou; Chongxin Shan; Hailin Peng; Weida Hu
• Keywords: Photodetection; Quantum Efficiency; Momentum (technical analysis)

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)/Bi2O2Se van der Waals (vdW) with momentum-matching and band-alignment heterostructures to achieve high QE. The QE was largely improved by optimizing generation, suppressing recombination, improving collection photocarriers. Note that BP/Bi2O2Se in k-space lead highly efficient generation transition recombination process can be suppressed lattice mismatching-immune vdW interfaces. Furthermore, type II could also assist fast transport By constructing heterostructures, a record-high 84% at 1.3 micrometers 76.5% 2 have been achieved photodetectors.