|
|
Type of Document Dissertation Author Rakos, Balazs Author's Email Address brakos@nd.edu URN etd-03072006-153640 Title Investigation of Metal-oxide-metal Structures for Optical Sensor Applications Degree Doctor of Philosophy Department Electrical Engineering Advisory Committee
Advisor Name Title Dr. Masaru K. Kuno Committee Chair Dr. Alexei O. Orlov Committee Member Dr. Gary H. Bernstein Committee Member Dr. Huili Xing Committee Member Dr. Patrick Fay Committee Member Dr. Wolfgang Porod Committee Member Keywords
- nanoelectronics
- MOM diode
- sensor
- tunneling
- visible
- infrared
Date of Defense 2006-02-22 Availability unrestricted Abstract In this work, we investigate metal-oxide-metal (MOM) structures for optical sensor applications in the case of low irradiances. MOM diodes can detect visible and infrared radiation in two different ways: using the rectifying properties of the diode (wave detection), or by thermal effects arising in the MOM junction upon irradiation. We present the fabrication, dc measurements, and visible and infrared measurements of MOM structures consist of ultrasmall (50 nm x 50 nm) symmetrical and asymmetrical tunnel junctions made by one electron beam lithography step and double-angle evaporation.The detectors give strong responses for visible and near-infrared radiations, and the wavelength dependence of the responsivity can be altered using different detector geometries. According to our calculations none of the effects previously published in the literature (rectification, thermal effects) can explain the unusually high sensitivity of our sensors. The experimental results suggest that the operation of the sensors is related to generation-recombination of electron-hole pairs in the substrate.
Files
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access RakosB032006.pdf 7.31 Mb 00:33:51 00:17:24 00:15:14 00:07:37 00:00:39