A quantum dot infrared photodetector with lateral carrier transport

In this contribution we present a normal-incidence quantum dot (QD) infrared detector structure. It is based on intra-conduction band transitions between the p-states of the QD and the wetting layer subband and lateral transport of photoexcited carriers in a channel next to the quantum dot layers. The photoresponse is peaked at 6.5 mum (186 meV) and reaches several A/W up to 60 K. The intrinsic detector response time is determined to be about 0.8 ms. Temperature and frequency dependence of the detector structure are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.