AI Article Synopsis
- Two-dimensional transition metal dichalcogenides (TMDCs) photodetectors are thin, which makes them less effective at absorbing light and affects their sensitivity.
- Integrating TMDCs with metal halide perovskite nanocrystals (PNCs) helps improve light absorption, but PNCs struggle with low charge mobility, making it hard to inject charges into TMDCs efficiently.
- The study introduces a MoS and PNCs heterostructure that enhances charge separation and photodetection sensitivity, achieving a high responsivity and specific detectivity, paving the way for cost-effective, high-performance phototransistors.
Article Abstract
While two-dimensional transition metal dichalcogenides (TMDCs)-based photodetectors offer prospects for high integration density and flexibility, their thinness poses a challenge regarding low light absorption, impacting photodetection sensitivity. Although the integration of TMDCs with metal halide perovskite nanocrystals (PNCs) has been known to be promising for photodetection with a high absorption coefficient of PNCs, the low charge mobility of PNCs delays efficient photocarrier injection into TMDCs. In this study, we integrated MoS with in situ formed core/shell PNCs with short ligands that minimize surface defects and enhance photocarrier injection. The PNCs/MoS heterostructure efficiently separates electrons and holes by establishing type II band alignment and consequently inducing a photogating effect. The synergistic interplay between photoconductive and photogating effects yields a high responsivity of 2.2 × 10 A/W and a specific detectivity of 9.0 × 10 Jones. Our findings offer a promising pathway for developing low-cost, high-performance phototransistors leveraging the advantages of two-dimensional (2D) materials.
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| http://dx.doi.org/10.1021/acsnano.4c02775 | DOI Listing |
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