Abstract
The lateral resolution of photocurrent techniques such as light-addressable potentiometric sensors (LAPS) or scanning photo-induced impedance microscopy (SPIM) is limited by the properties of the semiconductor material used. We investigated metal-insulator-semiconductor (MIS) structures based on amorphous silicon (a-Si) prepared as a thin layer on transparent glass substrates. It was shown that a sub-micrometer resolution can be achieved for this material, which is much better than the results for single crystalline Si. Some limitations caused by light scattering in the structure were observed.
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