Hybrid 2D-QD MoS2–PbSe quantum dot broadband photodetectors with high-sensitivity and room-temperature operation at 2.5 µm
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hdl:2117/366398
Tipus de documentArticle
Data publicació2021-09-12
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
ProjecteGrapheneCore3 - Graphene Flagship Core Project 3 (EC-H2020-881603)
HEINSOL - Hierarchically Engineered Inorganic Nanomaterials from the atomic to supra-nanocrystalline level as a novel platform for SOLution Processed SOLar cells (EC-H2020-725165)
HEINSOL - Hierarchically Engineered Inorganic Nanomaterials from the atomic to supra-nanocrystalline level as a novel platform for SOLution Processed SOLar cells (EC-H2020-725165)
Abstract
Broadband infrared photodetectors have profound importance in diverse applications including security, gas sensing, bioimaging, spectroscopy for food quality, and recycling, just to name a few. Yet, these applications can currently be served by expensive epitaxially grown photodetectors, limiting their market potential and social impact. The use of colloidal quantum dots (CQDs) and 2D materials in a hybrid layout is an attractive alternative to design low-cost complementary metal-oxide-semiconductor (CMOS) compatible infrared photodetectors. However, the spectral sensitivity of these conventional hybrid detectors is restricted to 2.1 µm. Herein, a hybrid structure comprising molybdenum disulfide (MoS2) with lead selenide (PbSe) CQDs is presented to extend their sensitivity further toward the mid-wave infrared, up to 3 µm. A room-temperature responsivity of 137.6 A/W and a detectivity of 7.7 × 10^10 Jones are achieved at 2.55 µm owing to highly efficient photoexcited carrier separation at the interface of MoS2 and PbSe in combination with an oxide coating to reduce dark current; the highest value is yet for a PbSe-based hybrid device. These findings strongly support the successful fabrication of hybrid devices, which may pave the pathway for cost-effective, high-performance, next-generation, novel photodetectors.
CitacióKundu, B. [et al.]. Hybrid 2D-QD MoS2–PbSe quantum dot broadband photodetectors with high-sensitivity and room-temperature operation at 2.5 µm. "Advanced optical materials", 12 Setembre 2021, vol. 9, núm. 22, p. 2101378-1-2101378-7.
ISSN2195-1071
Altres identificadorshttps://arxiv.org/abs/2203.13581
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