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Highly selective spectral response with enhanced responsivity of n-ZnO/p-Si radial heterojunction nanowire photodiodes

Title
Highly selective spectral response with enhanced responsivity of n-ZnO/p-Si radial heterojunction nanowire photodiodes
Authors
Um H.-D.Moiz S.A.Park K.-T.Jung J.-Y.Jee S.-W.Ahn C.H.Kim D.C.Cho H.K.Kim D.-W.Lee J.-H.
Ewha Authors
김동욱
SCOPUS Author ID
김동욱scopus
Issue Date
2011
Journal Title
Applied Physics Letters
ISSN
0003-6951JCR Link
Citation
vol. 98, no. 3
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
A radial heterojunction nanowire diode (RND) array consisting of a ZnO (shell)/Si (core) structure was fabricated using conformal coating of a n -type ZnO layer that surrounded a p -type Si nanowire. In both ultraviolet (UV) and visible ranges, the photoresponsivity of the RND was larger than that of a planar thin film diode (PD) owing to the efficient carrier collection with improved light absorption. Compared to a PD, in the forward bias, a 6 μm long RND resulted in a ∼2.7 times enhancement of the UV responsivity at λ=365 nm, which could be explained based on the oxygen-related hole-trap mechanism. Under a reverse bias, UV-blind visible detection was observed while the UV response was suppressed. © 2011 American Institute of Physics.
DOI
10.1063/1.3543845
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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