High Purity GaAs Far IR Photoconductor With Enhanced Quantum Efficieny

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$70,000.00
Award Year:
2005
Program:
SBIR
Phase:
Phase I
Contract:
NNG05CA84C
Agency Tracking Number:
040906
Solicitation Year:
2004
Solicitation Topic Code:
S2.01
Solicitation Number:
n/a
Small Business Information
TechnoScience Corporation
P.O. Box 60658, Palo Alto, CA, 94306-2306
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
938517315
Principal Investigator:
Jam Farhoomand
Principal Investigator
(650) 838-9833
jfarhoomand@mail.arc.nasa.gov
Business Contact:
Jam Farhoomand
Business Official
(650) 838-9833
jfarhoomand@mail.arc.nasa.gov
Research Institution:
n/a
Abstract
This proposal introduces an innovative concept aimed to significantly enhance the quantum efficiency of a far-infrared GaAs photoconductor and achieve sensitivity levels of 10E-18 W/SQRT(Hz) or better. We propose to employ a microwave source to assist the photoionization process by pumping the infrared-generated electrons from the excited states to the continuum. Since the microwave photons are low in energy, they are not available to directly ionize the ground state of the shallow donors. Therefore, the microwave pumping process is not expected to generate additional leakage current and the associated noise. This will allow us to cool the detector as low as necessary to reduce the thermal leakage current and improve the detector's noise performance. GaAs covers the 100-310?m spectrum where no other photodetector operates, it can be fabricated in large arrays, and is compatible with the established silicon readout technology. The proposed concept can be applied in a broader scope to other photodetectors, such as Ge:Ga, to exploit their excited state photoconductivity and extend their long wavelength response. This effort fits well within the scope of the SBIR Subtopic S2.01 and will be a benefit to many large and small NASA projects such as SOFIA and SAFIR.

* information listed above is at the time of submission.

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