Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

A study on sub-bandgap photoexcitation in nitrogen- and boron-doped diamond with interdigitated device structure

Journal Article · · Applied Physics Letters
DOI:https://doi.org/10.1063/5.0083710· OSTI ID:1979043

Diamond is an ultrawide-bandgap semiconductor suitable for high power devices that require high current carrying capacity, high blocking voltages, and smaller form factors. We investigated various diamond structures for extrinsic photoconductive semiconductor switches, including an insulating high-pressure high-temperature type Ib (highly nitrogen-doped) substrate, a chemical vapor deposited (CVD) type IIa (unintentionally doped) substrate, a CVD grown semiconducting boron-doped epilayer on a type IIa substrate, and boron-implanted type Ib and IIa substrates. Using these samples, we fabricated and characterized planar interdigitated photoconductive switches with 30 μm, electrode gaps. 532 and 1064 nm Nd:YAG laser pulses with energies up to 3.5 mJ/pulse were used to trigger the switches. Photoresponses were measured at bias voltages ranging from 10 to 100 V, corresponding to electric fields of 3.3–33 kV/cm. In this field range, the type Ib device exhibited the highest average on/off-state current ratio, on the order of 1011, when triggered with 0.8 mJ/pulse, 532 nm laser pulses. However, only the CVD grown boron-doped epilayer and boron implanted IIa devices showed decent sensitivity to 1064 nm.

Research Organization:
Arizona State University, Tempe, AZ (United States); Stanford University, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Stanford Precourt Institute
Grant/Contract Number:
SC0021230
OSTI ID:
1979043
Alternate ID(s):
OSTI ID: 1855511
Journal Information:
Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 11 Vol. 120; ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

References (16)

A diamond opto-electronic switch journal July 1983
Boron doped diamond films: Electrical and optical characterization and the effect of compensating nitrogen journal January 1995
Optical detection of defect centers in CVD diamond journal July 2000
Photoconductivity of undoped, nitrogen- and boron-doped CVD- and synthetic diamond journal June 1998
Diamond as an electronic material journal January 2008
Extrinsic photoconductivity in chemical vapor deposition diamond journal March 1991
Compensation effects in nitrogen‐doped diamond thin films journal December 1991
4H–SiC photoconductive switching devices for use in high-power applications journal May 2003
Generation and transport of photoexcited electrons in single-crystal diamond journal April 2009
High voltage optoelectronic switching in diamond journal July 1983
Photoconductive switching in diamond under high bias field journal December 1990
Photoconductive Switch with High Sub-Bandgap Responsivity in Nitrogen-Doped Diamond journal January 2020
Design and Evaluation of a Compact Silicon Carbide Photoconductive Semiconductor Switch journal February 2011
High voltage bulk GaN-based photoconductive switches for pulsed power applications conference March 2013
Dependence of conduction characteristics on compensation type and lattice structure of SiC photoconductive semiconductor switches journal January 2021
Wide Bandgap Extrinsic Photoconductive Switches report July 2013