Photodetection by Hot Electrons or Hot Holes: A Comparable Study on Physics and Performances.

ABSTRACT: Hot-carrier photodetectors are drawing significant attention; nevertheless, current researches focus mostly on the hot-electron devices, which normally show low quantum efficiencies. In contrast, hot-hole photodetectors usually have lower barriers and can provide a wide spectral range of photodetection and an improved photoconversion efficiency. Here, we report a comparable study of the hot-electron and hot-hole photodetectors from both underlying physics and optoelectronic performance perspectives. Taking the typical Au/Si Schottky contact as an example, we find obvious differences in the energy band diagram and the sequent hot-carrier generation/transport/emission processes, leading to very distinguished photodetection performances. Compared with hot electrons, hot holes show higher dens

SUBMITTER: Sun Q 

PROVIDER: S-EPMC6648420 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature