DETECTION DEVICE FOR TWO DIFFERENT COLOURS WITH IMPROVED OPERATING CONDITIONS
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United States of America Patent
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Issued Date -
May 16, 2013
app pub date -
Nov 15, 2012
filing date -
Nov 15, 2011
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Abandoned
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Abstract
The substrate includes successively a first semiconductor layer having a first bandgap energy, a semiconductor buffer layer, a second semiconductor layer having a first bandgap energy different from the first bandgap energy. Two photodetectors sensitive to two different colors are formed respectively on the first and second semiconductor layers. A first biasing pad electrically connects the first semiconductor layer to a first biasing circuit. A second biasing pad electrically connects the second semiconductor layer to a second biasing circuit. The first biasing pad is devoid of electrical contact with the second semiconductor layer.
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