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- W2294652209 abstract "Short-wave infrared (SWIR) detectors are typically based on III-V epitaxial materials, resulting in expensive devices, especially when used in a linear on two-dimensional focal plane array. Colloidal quantum dots (QDs) as a new optoelectronic material, provides an alternative way to achieve SWIR photodetectors, either as discrete components or being integrated on photonic integrated circuits. The colloidal QDs are prepared by simple hot injection chemical synthesis, which provides a significant cost reduction. Due to the quantum size effect, the electrical and chemical properties of QDs can be easily modified. Moreover, the fact that the suspension of QDs is in solution allows straightforward integration on large area substrates.In this study, PbS colloidal QDs were investigated for SWIR photodetector applications. Starting from colloidal QDs with their as-synthesized organic ligands, a layer-by-layer approach is used to fabricate uniform, ultra smooth and crack-free QD films. Each cycle involves a deposition of a QD layer by dip coating, the replacement of native organic ligands by inorganic moieties (S2- and OH-), followed by a thorough cleaning of the film afterwards. Here the short inorganic ligands are used to facilitate the charge carrier transport. The PbS QD films are fabricated on a pair of interdigitated gold electrodes. Afterwards a selective wet-etching approach is used to achieve micropatterned QD film and the resulting films are then passivated with aluminum oxide film through atomic layer deposition (ALD) to realize air stable devices. After passivation, the QD photodetectors exhibit improved stability and performance in air. A 2.4μm cut-off wavelength is obtained. The detector time response is suitable for imaging applications." @default.
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- W2294652209 date "2014-01-01" @default.
- W2294652209 modified "2023-09-23" @default.
- W2294652209 title "Short-wave infrared PbS colloidal quantum dot photodetectors with AlOx atomic layer deposition passivation" @default.
- W2294652209 hasPublicationYear "2014" @default.
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