Few-Layer MoS2/a-Si:H Heterojunction Pin-Photodiodes
for Extended Infrared Detection
Version 2 2019-05-31, 23:44Version 2 2019-05-31, 23:44
Version 1 2019-05-15, 15:06Version 1 2019-05-15, 15:06
Posted on 2019-05-31 - 23:44
Few-layer molybdenum disulfide (FL-MoS2) films have
been integrated into amorphous silicon (a-Si:H) pin-photodetectors.
To achieve this, vertical a-Si:H photodiodes were grown by plasma-enhanced
chemical vapor deposition (PE-CVD) on top of large-scale synthesized
and transferred homogeneous FL-MoS2. This novel detector
array exhibits long-term stability (more than six month) and outperforms
conventional silicon-based pin-photodetectors in the infrared range
(IR, λ = 2120 nm) in terms of sensitivities by up to ∼50
mAW–1. Photodetectivities of up to ∼2 ×
1010 Jones and external quantum efficiencies of ∼3%
are achieved. The detectors further feature the additional functionality
of bias-dependent responsivity switching between the different spectral
ranges. The realization of such scalable detector arrays is an essential
step toward pixelated and wavelength-selective sensors operating in
the IR spectral range.
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Bablich, Andreas; Schneider, Daniel S.; Kienitz, Paul; Kataria, Satender; Wagner, Stefan; Yim, Chanyoung; et al. (2019). Few-Layer MoS2/a-Si:H Heterojunction Pin-Photodiodes
for Extended Infrared Detection. ACS Publications. Collection. https://doi.org/10.1021/acsphotonics.9b00337