Ligand engineering of mid-infrared Ag2Se colloidal quantum dots

Document Type

Article

Publication Date

10-1-2020

Abstract

Silver selenide colloidal quantum dots exhibit distinct optical absorption in the mid-wavelength infrared spectral region, which arises from the intraband transition between the first and the second quantum-confined energy levels. The optical absorption coefficient, carrier mobility, and carrier lifetime, which are the three primary parameters that determine the ultimate performance of a photodetector, are expected to be heavily dependent on the surface capping ligands. Herein, we characterize these parameters on silver selenide colloidal quantum dots films chemically treated with ligands selected from literatures that report high-performance quantum dot-based solar cells, photodetectors, transistors, and thermoelectrics. We correlate these results with the mid-infrared responsivities measured from photoconductive photodetectors fabricated from respective ligand-exchanged films. The insights gained from this study may serve as a foundation for enabling future intraband CQD-based MWIR sensing and imaging technologies.

Identifier

85085270796 (Scopus)

Publication Title

Physica E Low Dimensional Systems and Nanostructures

External Full Text Location

https://doi.org/10.1016/j.physe.2020.114223

ISSN

13869477

Volume

124

Grant

1809064

Fund Ref

National Science Foundation

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