Breakdown and photoconductivity enhancement by mixed reflective Al-doped ZnO/Ag electrode in vertical SiC photoconductive switch

an axial-triggering vertical SiC photoconductive switch with Al-doped ZnO placed under the Ag electrode is developed to enhance breakdown strength and photoconductivity. Traditional and new devices with the AZO/SiC/Ag and AZO/SiC/AZO/Ag structures, respectively, were prepared. Test results show that...

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Bibliographic Details
Published in:IEEE electron device letters 2023-05, Vol.44 (5), p.1-1
Main Authors: Wang, Langning, Zeng, Linglong, Liu, Fuying, Yi, Muyu, Yao, Jinmei, Xun, Tao, Yang, Hanwu, He, Juntao
Format: Article
Language:English
Subjects:
Absorption
axial triggering
Breakdown
Electric breakdown
Electrodes
Lasers
Mirrors
Photoconductivity
Pulse duration
Service life assessment
Silicon carbide
silicon carbide photoconductive switch
transparent electrode
Zinc oxide
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Summary:an axial-triggering vertical SiC photoconductive switch with Al-doped ZnO placed under the Ag electrode is developed to enhance breakdown strength and photoconductivity. Traditional and new devices with the AZO/SiC/Ag and AZO/SiC/AZO/Ag structures, respectively, were prepared. Test results show that the conductivity of the new device is approximately 1.2 times higher than that of the old one, attributable to the diffuse reflection effects of the AZO/Ag mirror. Under high bias voltages of up to 16.5 kV/mm and a 30-ns pulse width laser input, the new device shows significantly enhanced breakdown strength. The new device has a lifetime of >1E4 shots, whereas the old device has a maximum lifetime of approximately 1E2 shots. The new device can continuously output electrical pulses for 10 minutes at a 100 Hz repetition rate, 30-ns pulse width, and 100 A peak current without breakdown.
ISSN:0741-3106
1558-0563
DOI:10.1109/LED.2023.3263525