Journal article
Low-temperature grown GaAs heterojunction metal-semiconductor-metal photodetectors improve speed and efficiency
Applied physics letters, v 99(20), pp 203502-203502-3
14 Nov 2011
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Low-temperature-grown GaAs (LT-GaAs) has a picosecond recombination lifetime, making a fast photodetector material but limiting carrier mobility and collection efficiency. Here, a metal-semiconductor-metal photodetector with a thin channel of regular-temperature GaAs (RT-GaAs) above LT-GaAs provides fast transit between contacts. A p-type delta doping layer below these layers produces a vertical electric field forcing optically generated electrons towards the channel. The AlGaAs/RT-GaAs heterojunction increases Schottky contacts, and the resulting 8-22 mu m pitch photodetectors have low (< 1-nA) dark current, 12-ps (oscilloscope-limited) pulsewidth, and 0.15-A/W responsivity. The devices demonstrate that fast LT-GaAs pulses are achievable with responsivity similar to RT-GaAs. (C) 2011 American Institute of Physics. [doi:10.1063/1.3662392]
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Details
- Title
- Low-temperature grown GaAs heterojunction metal-semiconductor-metal photodetectors improve speed and efficiency
- Creators
- Marc Currie - USN, Div Opt Sci, Res Lab, Washington, DC 20375 USAFabio Quaranta - CNR, IMM, I-73100 Lecce, ItalyAdriano Cola - CNR, IMM, I-73100 Lecce, ItalyEric M. Gallo - Drexel Univ, Dept Elect & Comp Engn, Philadelphia, PA 19104 USABahram Nabet - Drexel University
- Publication Details
- Applied physics letters, v 99(20), pp 203502-203502-3
- Publisher
- American Institute of Physics
- Number of pages
- 3
- Grant note
- ECCS-0702716 / NSF; National Science Foundation (NSF) Office of Naval Research ASEE-ONR; Office of Naval Research
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Electrical and Computer Engineering
- Web of Science ID
- WOS:000297786500065
- Scopus ID
- 2-s2.0-81855197992
- Other Identifier
- 991019168328304721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied