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Semitransparent all-oxide p-NiO/n-ZnO nanowire ultraviolet photosensors

Published online by Cambridge University Press:  25 September 2013

Ki Ryong Lee ,
Byung Oh Jung ,
Sung Woon Cho ,
Karuppanan Senthil  and
Hyung Koun Cho
Ki Ryong Lee
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Cheon Cheon-dong, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Republic of Korea
Byung Oh Jung
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Cheon Cheon-dong, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Republic of Korea
Sung Woon Cho*
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Cheon Cheon-dong, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Republic of Korea
Karuppanan Senthil
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Cheon Cheon-dong, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Republic of Korea
Hyung Koun Cho*
Affiliation:
School of Advanced Materials Science and Engineering, Sungkyunkwan University, Cheon Cheon-dong, 2066, Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 440-746, Republic of Korea
*
a)Address all correspondence to this author. e-mail: chohk@skku.edu
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Abstract

All-oxide ultraviolet (UV) photosensors based on NiO/ZnO nanowire heterostructure were fabricated on corning glass substrates. The p-type NiO layers were directly deposited on the ZnO nanowire arrays grown on the AZO bottom electrode/glass for the formation of a p–n diode, followed by the growth of the ITO top electrode layer for the electrical interconnection of nanostructures. The fabricated device structure showed a transmittance value of about 60% in the visible region, resulting in semitransparent properties. The current–voltage (I–V) characteristics of the fabricated p–n heterostructure showed a typical rectifying behavior with a current rise at about 4 V and an I(forward)/I(reverse) ratio of about 11.3 at 8 V. In addition, the ITO/p-NiO/n-ZnO/AZO structure responded at a wave-length position of 370 nm in reverse bias, together with weak photoresponse in the visible region. An UV sensor based on the all-oxide ZnO nanowire absorber exhibited improved photoresponse compared to the device based on a ZnO thin film.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 18 , 28 September 2013 , pp. 2605 - 2610
Copyright
Copyright © Materials Research Society 2013 

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