Ultrathin oxide controlled photocurrent generation through a metal–insulator–semiconductor heterojunction  

作　　者：NING LIU XIAOHONG YAN LONG GAO SERGEY BELOSHAPKIN CHRISTOPHE SILIEN HONG WEI 

机构地区：[1]Department of Physics,University of Limerick,Limerick,Ireland [2]Bernal Institute,University of Limerick,Limerick,Ireland [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Photonics Research》2022年第8期1996-2007,共12页光子学研究（英文版）

基　　金：Irish Research Council(New Foundations),Science Foundation Ireland(SFI 17/CDA/4733);National Natural Science Foundation of China(11774413,12074421);Strategic Priority Research Program of Chinese Academy of Sciences(XDB33000000)。

摘　　要：Recent advances in nanoscale lasers,amplifiers,and nonlinear optical converters have demonstrated the unprecedented potential of metal–insulator–semiconductor(MIS)structures as a versatile platform to realize integrated photonics at the nanoscale.While the electric field enhancement and confinement have been discussed intensively in MIS based plasmonic structures,little is known about the carrier redistribution across the heterojunction and photocurrent transport through the oxide.Herein,we investigate the photo-generated charge transport through a single Cd Se microbelt-Al_(2)O_(3)-Ag heterojunction with oxide thickness varying from 3 nm to 5 nm.Combining photocurrent measurements with finite element simulations on electron(hole)redistribution across the heterojunction,we are able to explain the loss compensation observed in hybrid plasmonic waveguides at substantially reduced pump intensity based on MIS geometry compared to its photonic counterpart.We also demonstrate that the MIS configuration offers a low-dark-current photodetection scheme,which can be further exploited for photodetection applications.

关 键 词：INSULATOR VERSATILE PUMP 

分 类 号：TN386.1[电子电信—物理电子学]