Precursor engineering enhanced responsivity of lead sulfide quantum dots shortwave infrared photodiode

Shichen Yin; Julian Gullett; Carr Hoi Yi Ho; Franky So

doi:10.1117/12.2570398

20 August 2020 Precursor engineering enhanced responsivity of lead sulfide quantum dots shortwave infrared photodiode

Shichen Yin, Julian Gullett, Carr Hoi Yi Ho, Franky So

Proceedings Volume 11465, Low-Dimensional Materials and Devices 2020; 114651L (2020) https://doi.org/10.1117/12.2570398
Event: SPIE Nanoscience + Engineering, 2020, Online Only

Conference Poster

Abstract

Lead sulfide (PbS) quantum dots (QDs) exhibiting the narrow bandgap (Eg < 0.9 eV) provide a promising avenue to high performance, inexpensive shortwave infrared (SWIR) photodetector. However, most PbS-QD based SWIR photodiodes suffers from low responsivity and low external quantum efficiency (EQE) in the IR range due to insufficient ligand exchange. Here, we report a precursor engineering strategy that facilitates the commonly used Tetrabutylammonium iodide (TBAI) ligand exchange. We synthesized the PbS QDs from Lead Oxide (PbO) and lead acetate trihydrate (PbAc₂·₃H₂O). Compared with PbS QDs photodiode based on PbO, the responsivity and EQE of PbS QDs photodiode based on PbAc2·3H2O have been improved from 0.15 to 0.586A/W and 12.35 to 47.27%.

Citation Download Citation

Shichen Yin, Julian Gullett, Carr Hoi Yi Ho, and Franky So "Precursor engineering enhanced responsivity of lead sulfide quantum dots shortwave infrared photodiode", Proc. SPIE 11465, Low-Dimensional Materials and Devices 2020, 114651L (20 August 2020); https://doi.org/10.1117/12.2570398

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