A high-performance long-wave infrared photodetector based on a WSe2/PdSe2 broken-gap heterodiode

Suofu Wang; Yajie Bai; Mingli Liu; Xiaolan Zong; Wenhui Wang; Qingge Mu; Tao Han; Feng Li; Shaoliang Wang; Lei Shan; Mingsheng Long

doi:10.1039/d3nr03248e

A high-performance long-wave infrared photodetector based on a WSe₂/PdSe₂ broken-gap heterodiode

Nanoscale. 2023 Nov 2;15(42):17006-17013. doi: 10.1039/d3nr03248e.

Authors

Suofu Wang¹, Yajie Bai¹, Mingli Liu¹, Xiaolan Zong², Wenhui Wang³, Qingge Mu¹, Tao Han¹, Feng Li¹, Shaoliang Wang¹, Lei Shan¹, Mingsheng Long¹

Affiliations

¹ Information Materials and Intelligent Sensing Laboratory of Anhui Province, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, Anhui University, 111 Jiu Long Road, Hefei 230601, China. longms@ahu.edu.cn.
² Institute for Quantum Control and Quantum Information, School of Physics and Materials Engineering, Hefei Normal University, Hefei 230601, China.
³ School of Physics, Southeast University, Nanjing 211189, China.

PMID: 37831435
DOI: 10.1039/d3nr03248e

Abstract

Layered narrow bandgap quasi-two-dimensional (2D) transition metal dichalcogenides (TMDs) demonstrated excellent performance in long-wave infrared (LWIR) detection. However, the low light on/off ratio and specific detectivity (D*) due to the high dark current of the device fabricated using a single narrow bandgap material hindered its wide application. Herein, we report a type-III broken-gap band-alignment WSe₂/PdSe₂ van der Waals (vdW) heterostructure. The heterodiode device has a prominently low dark current and exhibits a high photoresponsivity (R) of 55.3 A W^-1 and a high light on/off ratio >10⁵ in the visible range. Notably, the WSe₂/PdSe₂ heterodiode shows an excellent uncooled LWIR response, with an R of ∼0.3 A W^-1, a low noise equivalence power (NEP) of 4.5 × 10^-11 W Hz^-1/2, and a high D* of 1.8 × 10⁸ cm Hz^1/2 W^-1. This work provides a new approach for designing high-performance room-temperature operational LWIR photodetectors.