Strong enhancement of photoresponsivity with shrinking the electrodes spacing in few layer GaSe photodetectors.

ABSTRACT: A critical challenge for the integration of optoelectronics is that photodetectors have relatively poor sensitivities at the nanometer scale. Generally, a large electrodes spacing in photodetectors is required to absorb sufficient light to maintain high photoresponsivity and reduce the dark current. However, this will limit the optoelectronic integration density. Through spatially resolved photocurrent investigation, we find that the photocurrent in metal-semiconductor-metal (MSM) photodetectors based on layered GaSe is mainly generated from the region close to the metal-GaSe interface with higher electrical potential. The photoresponsivity monotonically increases with shrinking the spacing distance before the direct tunneling happens, which was significantly enhanced up to 5,000 AW(-1) fo

SUBMITTER: Cao Y 

PROVIDER: S-EPMC4311250 | biostudies-literature | 2015 Jan

REPOSITORIES: biostudies-literature