Parmod Kumar, Akshaykumar Salunke, Sarjeet Kumar and Santanu Pradhan*,
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Ultralow Dark Current in Lead Sulfide Colloidal Quantum Dots Near-Infrared Photodetectors Achieved through Trap Passivation with Efficient Surface Ligands Attachment
Dark current plays a significant role in deciding various device parameters like the on/off ratio, responsivity, detectivity, etc., in photodetectors. A lower dark current is desirable for a superior photodetector performance. Lead sulfide (PbS) colloidal quantum dots (CQDs)-based photodetectors suffer from trap-induced leakage current, resulting in a high dark current and significantly lowering the devices’ performance. Here, we report a simple and efficient method to reduce the dark current of PbS CQDs-based photodetectors through trap passivation by forming bulk heterojunctions (BHJs) with zinc oxide (ZnO) nanocrystals (NCs) and ligand engineering. The suitable arrangement of the BHJ ensemble leads to a better ligand arrangement on the CQDs surface, resulting in a low dark current. Optimized mixing of ZnO NCs with PbS CQDs resulted in a dark current reduction from 15.92 to 0.12 nA/cm2 with trap state density reduction from 2 × 1016 to 5 × 1015 cm–3. The reduction results in nearly 2 orders of magnitude improvement in the on/off ratio and 1 order of magnitude improvement in the detectivity (∼1012 to ∼1013 Jones).
期刊介绍:
ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric.
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