Silver Selenide Colloidal Quantum Dots for Mid-Wavelength Infrared Photodetection

Document Type

Article

Publication Date

3-22-2019

Abstract

Lately discovered silver selenide (Ag2Se) colloidal quantum dots with tetragonal crystal structure exhibit promising optical properties in the mid-wavelength infrared. Although colloidal synthesis of uniform sizes and shapes as well as detailed phase transformation and photoluminescence properties have been studied recently, investigations of their optoelectronic properties as an active layer in photodetector devices remain scarce. Herein, we present the fabrication and characterization of Ag2Se colloidal quantum dot-based photoconductive photodetectors. We investigate the effect of ligand exchange as well as temperature and spectral-dependent photoresponses. Our results suggest that further enhancement in performance could be achieved through accurate control of carrier concentration. With this improvement, Ag2Se colloidal quantum dots may serve as a promising mid-wavelength infrared absorber for the development of thermal infrared sensors and imagers with low size, weight, power consumption, and cost. ©

Identifier

85071005537 (Scopus)

Publication Title

ACS Applied Nano Materials

External Full Text Location

https://doi.org/10.1021/acsanm.9b00069

e-ISSN

25740970

First Page

1631

Last Page

1636

Issue

3

Volume

2

Grant

1809064

Fund Ref

National Science Foundation

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