Fast Detection of Infrared Laser Pulses on Planar Small Area, GaAs/AlGaAs Heterojunction
E. Širmulis, V. Kazlauskaitė, J. Gradauskas, A. Sužiedėlis and S. Ašmontas
Semiconductor Physics Institute, A. Goštauto 11, LT-01108 Vilnius, Lithuania
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Received: 26 08 2007;
We report the first experimental observation of fast photovoltage in small area GaAs/AlGaAs heterojunction planar detector induced by nanosecond CO2 laser pulses. This device revealed itself as a sensitive detector of millimeter waves and as a fast IR sensor operating at room temperature. Taking into account fast response of the detector and close to linear voltage-power dependence, the results are interpreted by photoemission of hot carriers over the potential barrier of the heterojunction.
DOI: 10.12693/APhysPolA.113.851
PACS numbers: 72.40.+w, 73.40.Kp