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PureB low-energy electron detectors with closely-packed photodiodes integrated on locally-thinned high-resistivity silicon

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5 Author(s)
Agata Sakic ; Delft Inst. of Microsyst. & Nanoelectron., Delft Univ. of Technol., Delft, Netherlands ; Silvana Milosavljevic ; Wim H. A. Wien ; Johannes M. W. Laros
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A Pure Boron (PureB) photodiode technology is developed for low-energy (down to 200 eV) electron detectors, and implemented in a versatile production-ripe process for highspeed detectors for Scanning Electron Microscopy (SEM). It is here investigated with respect to transfer from the existing low-resistivity-silicon (LRS) process to a locally-thinned high-resistivity-silicon (HRS) process. In this way a lower capacitance, i.e., a wider low-doped region, can be achieved. A trade-off must be made to meet the demands of optimized SEM imaging: the larger lateral depletion of each photodiode can be in conflict with the requirement to have the detector divided into arrays of several electrically-separated closely-packed photodiodes. Here a 37% reduction in total capacitance is achieved, with junction capacitance of <; 1 pF/mm2, while detection efficiency, series resistance, dark current, and packing density are kept within specifications.

Published in:

Sensors, 2012 IEEE

Date of Conference:

28-31 Oct. 2012