期刊
NANOTECHNOLOGY
卷 22, 期 26, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/22/26/265506
关键词
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资金
- Ministry of Education, Science and Technology (MEST) [2009-0078876, 2010-0002231]
- Ministry of Knowledge Economy (MKE)
- Korea Industrial Technology Foundation (KOTEF)
- Ministry of Education, Science, and Technology (MEST) through the National Research Foundation of Korea [NRF-2009-C1AAA001-2009-0093879]
- Ministry of Knowledge Economy (MKE), Republic of Korea [2008-A08-005] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2009-0093885, 2009-0078876, 2009-0083009] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study reports that the visible-blind ultraviolet (UV) photodetecting properties of ZnO nanowire based photodetectors were remarkably improved by introducing ultrathin insulating MgO layers between the ZnO nanowires and Si substrates. All layers were grown without pause by metal organic chemical vapor deposition and the density and vertical arrangement of the ZnO nanowires were strongly dependent on the thickness of the MgO layers. The sample in which an MgO layer with a thickness of 8 nm was inserted had high density nanowires with a vertical alignment and showed dramatically improved UV photosensing performance (photo-to-dark current ratio = 1344.5 and recovery time = 350 ms). The photoresponse spectrum revealed good visible-blind UV detectivity with a sharp cut off at 378 nm and a high UV/visible rejection ratio. A detailed discussion regarding the developed UV photosensing mechanism from the introduction of the i-MgO layers and highly dense nanowires in the n-ZnO nanowires/i-MgO/n-Si substrates structure is presented in this work.
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