Fast color detection with two-terminal p-i-i-n devices
- Univ. Stuttgart (Germany)
In order to overcome the intrinsic speed limitation of amorphous silicon nipin color sensors the authors present an alternative way of achieving bias-controlled spectral sensitivity of two-terminal thin film devices. piin structures with appropriate band gap and thickness of their single layers can be used as photodetectors that are able to sequentially extract different color signals. Color separation is achieved by controlling the absorption and electric field profile across these piin devices, and thanks to the differences in electron and hole transport properties. Because in contrast to nipin devices there is no need for reverting readout voltages for color separation, this type of sensors can be operated at much higher readout frequencies. Spectral response and bias voltage transients have been analyzed up to 20 kHz, and preliminary data are presented on the optimization transients have been analyzed up to 20 kHz, and preliminary data are presented on the optimization of speed, dynamic range and color separation by varying bandgap and thickness of p- and i-layers. Furthermore a three-color sensor has been realized by introducing an additional intrinsic layer.
- OSTI ID:
- 527626
- Report Number(s):
- CONF-960401--; ISBN 1-55899-323-1
- Country of Publication:
- United States
- Language:
- English
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