Journal
FRESENIUS JOURNAL OF ANALYTICAL CHEMISTRY
Volume 367, Issue 4, Pages 329-333Publisher
SPRINGER VERLAG
DOI: 10.1007/s002160000409
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A miniaturized optical set-up based on a CDROM player optic was developed for LAPS (light addressable potentiometric sensors). A focus of 2.6 mu m was achieved using this easy to handle device. The lateral resolution of LAPS measurements can be improved by using GaAs as the semiconductor material instead of Si. The diffusion length of the minority charge carriers was determined to be smaller than 3.1 mu m. A new method called SPIM (scanning photo-induced impedance microscopy) is described. Using this technique, the impedance of thin films can be measured with lateral resolution.
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