4.8 Article

Flexible hybrid graphene/a-Si: H multispectral photodetectors

Journal

NANOSCALE
Volume 9, Issue 25, Pages 8573-8579

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr02828h

Keywords

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Funding

  1. German Research Foundation [DFG LE 2440/1-2, GRK 1564]
  2. European Research Council through an ERC Starting Grant (InteGraDe) [307311]
  3. European Regional Funds (HEA2D)
  4. European Research Council (ERC) [307311] Funding Source: European Research Council (ERC)

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We report on the integration of large area CVD grown single-and bilayer graphene transparent conductive electrodes (TCEs) on amorphous silicon multispectral photodetectors. The broadband transmission of graphene results in 440% enhancement of the detectors' spectral response in the ultraviolet (UV) region at lambda = 320 nm compared to reference devices with conventional aluminum doped zinc oxide (ZnO:Al) electrodes. The maximum responsivity of the multispectral photodetectors can be tuned in their wavelength from 320 nm to 510 nm by an external bias voltage, allowing single pixel detection of UV to visible light. Graphene electrodes further enable fully flexible diodes on polyimide substrates. Here, an upgrade from single to bilayer graphene boosts the maximum photoresponsivity from 134 mAW(-1) to 239 mAW(-1). Interference patterns that are present in conventional TCE devices are suppressed as a result of the atomically thin graphene electrodes. The proposed detectors may be of interest in fields of UV/VIS spectroscopy or for biomedical and life science applications, where the extension to the UV range can be essential.

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