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Suppression of the dark current in PbS quantum dot infrared photodetectors through the introduction of a CuInSeS interfacial layer.
- Source :
- Journal of Materials Chemistry C; 3/28/2024, Vol. 12 Issue 12, p4493-4500, 8p
- Publication Year :
- 2024
-
Abstract
- Lead sulfide (PbS) colloidal quantum dot (CQD) materials are extensively utilized in the fabrication of near-infrared detectors. Advanced PbS quantum dot infrared detectors often employ ligand exchange processes to enhance the performance of the active layer. This process involves the replacement of long-chain ligands, which exhibit poor conductivity, with short-chain ligands, such as 1,2-ethanedithiol (EDT) in the treatment of PbS. However, conventional solid-state ligand exchange techniques are prone to cause inherent cracking, resulting in significant leakage currents that limit detector sensitivity. To address this challenge, we introduce a copper indium selenium sulfur (CuInSeS) quantum dot interfacial layer, resulting in the creation of a smooth and crack-free film. This method effectively optimizes the interfacial contact between PbS and ZnO. Additionally, this layer concurrently establishes a gradient energy level, facilitating the transport of charge carriers. This results in a decrease in the dark current to 4.6 × 10<superscript>−8</superscript> mA under a −1 V bias, achieving a detectivity of 1.87 × 10<superscript>12</superscript> Jones. The results demonstrate that the quantum dot interfacial layer effectively suppresses the dark current of the detector, addressing the deficiencies associated with the solid-state ligand exchange technique. This work provides a direction for further research on detectors. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507526
- Volume :
- 12
- Issue :
- 12
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry C
- Publication Type :
- Academic Journal
- Accession number :
- 176153000
- Full Text :
- https://doi.org/10.1039/d3tc04746f