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An infrared photodetector using the structure of a 15-period superlattice (SL) integrated with 50-period multiple quantum wells (MQWs) is investigated. The MQWs are utilized to reduce the noise current power and to add the response range. From the results of current ratio and response, the photocurrent of the SL is not reduced by the additional MQWs but the dark current is. Hence, due to the low noise...
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