Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 53, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/JJAP.53.050307
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Funding
- Advanced Low Carbon Technology Research and Development Program (ALCA), Japan Science and Technology Agency (JST)
- Mazda Foundation
- Japan Society for the Promotion of Science (JSPS) for Young Scientists
- Grants-in-Aid for Scientific Research [25889074, 24656389] Funding Source: KAKEN
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Carrier transport and photodetection in heterojunction photodiodes comprising n-type Si substrates and p-type B-doped ultrananocrystalline diamond/hydrogenated amorphous carbon composite (UNCD/a-C:H) films were investigated. Their transport model was discussed mainly on the basis of electrical measurements. It was revealed that an a-C:H matrix in UNCD/a-C:H would predominantly be responsible for carrier transportation in the photodiodes. The photodiodes exhibited high external quantum efficiencies of 72 and 23% under 254 and 365 nm UV illuminations, respectively. These superior responses might be attributable to the photocarrier generation in UNCD grains accompanied by an efficient carrier transport to the a-C:H matrix. (C) 2014 The Japan Society of Applied Physics
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