Mechanism of photoconductivity gain and persistent photoconductivity for diamond photodetector

Photoconductivity gain (PG) and persistent photoconductivity (PPC) properties observed in diamond photodetector are theoretically explained by solving rate equations which describe capture and emission processes of photo-generated hole and electron through a boron acceptor and a hole trap in a diamo...

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Bibliographic Details
Published in:Diamond and related materials 2010-02, Vol.19 (2), p.205-207
Main Authors: Koide, Yasuo, Liao, M.Y., Imura, M.
Format: Article
Language:English
Subjects:
Applied sciences
Boron
Carbide
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Diamond
Diodes
DUV photodetector
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Electronic transport phenomena in thin films and low-dimensional structures
Electronics
Emission
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Gain
Hole traps
Materials science
Mathematical analysis
Optoelectronic devices
Persistent photoconductivity
Photoconduction and photovoltaic effects
photodielectric effects
Photoconductivity
Photoconductivity gain
Photodetectors
Physics
Schottky photodiode
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Specific materials
Ultraviolet
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Description
Summary:Photoconductivity gain (PG) and persistent photoconductivity (PPC) properties observed in diamond photodetector are theoretically explained by solving rate equations which describe capture and emission processes of photo-generated hole and electron through a boron acceptor and a hole trap in a diamond epilayer and a nitrogen donor in a diamond substrate. Formation of one-sided pn-junction between the epilayer and substrate and slow hole capture rate of acceptor and hole trap levels provide accumulation of photo-generated hole in the epilayer, which produces the PG larger than the ideal responsivity. The PPC current after turning off the deep ultraviolet light is interpreted as due to the slow hole capture rate of the acceptor and trap levels.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2009.08.016