Position sensing by transient photocurrents of organic photodiodes
AP Arndt, SW Kettlitz, J Mescher… - IEEE Photonics …, 2015 - ieeexplore.ieee.org
IEEE Photonics Technology Letters, 2015•ieeexplore.ieee.org
Organic photodiodes not only show good quantum efficiencies in the visible range and fast
pulse responses down to the nanosecond regime, but also allow for arbitrary shapes of the
active area. The usual device structure is a thin organic semiconductor absorber
sandwiched between two electrodes of which one is transparent. This leads to a high device
capacitance for large area devices. In conjunction with a high electrode resistance, the
transient photocurrent response under localized pulse excitation becomes dependent on the …
pulse responses down to the nanosecond regime, but also allow for arbitrary shapes of the
active area. The usual device structure is a thin organic semiconductor absorber
sandwiched between two electrodes of which one is transparent. This leads to a high device
capacitance for large area devices. In conjunction with a high electrode resistance, the
transient photocurrent response under localized pulse excitation becomes dependent on the …
Organic photodiodes not only show good quantum efficiencies in the visible range and fast pulse responses down to the nanosecond regime, but also allow for arbitrary shapes of the active area. The usual device structure is a thin organic semiconductor absorber sandwiched between two electrodes of which one is transparent. This leads to a high device capacitance for large area devices. In conjunction with a high electrode resistance, the transient photocurrent response under localized pulse excitation becomes dependent on the position. We make use of this effect and demonstrate a method for position sensing in oblong organic photodiodes achieving a standard deviation in the position measurement of less than 100 μm at the edges and 12 μm at the center of an 8000-μm long device.
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