Strong photo-response in a flip-chip nanowire p-Cu2O/n-ZnO junction

Meenal Deo; Sarfraj Mujawar; Onkar Game; Ashish Yengantiwar; Arun Banpurkar; Sneha Kulkarni; Jyoti Jog; Satishchandra Ogale

doi:10.1039/C1NR10665A

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Strong photo-response in a flip-chip nanowire p-Cu₂O/n-ZnO junction†

Meenal Deo,^ad Sarfraj Mujawar,^a Onkar Game,^a Ashish Yengantiwar,^b Arun Banpurkar,^c Sneha Kulkarni,^a Jyoti Jog^d and Satishchandra Ogale*^a

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* Corresponding authors

^a Physical and Materials Chemistry Division, National Chemical Laboratory, Dr Homi Bhabha Road, Pune, India
E-mail: sb.ogale@ncl.res.in
Fax: +91 20 2590 2636
Tel: +91 20 2590 2260

^b Department of Physics, Fergusson College, Pune, India

^c Department of Physics, University of Pune, Pune, India

^d Polymer Science and Engineering Division, National Chemical Laboratory, Dr Homi Bhabha Road, Pune, India

Abstract

Cu₂O nanoneedles are synthesized on a copper substrate by a simple anodization and reducing ambient annealing protocol. ZnO nanorods are grown on ITO coated glass by a low temperature chemical route. The electronic and photo-response properties of the p-Cu₂O/n-ZnO flip-chip heterojunction are then studied and analyzed. We show that the I–V characteristic is rectifying and the junction exhibits a good photoresponse (∼120% under 1 V reverse bias) under AM 1.5 (1 Sun) illumination. This nano-heterojunction photo-response is far stronger as compared to that of a pulsed laser deposited thin film p-Cu₂O/n-ZnO heterojunction, which can be attributed to higher junction area in the former case.

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Article information

DOI: https://doi.org/10.1039/C1NR10665A
Article type: Paper
Submitted: 23 Jun 2011
Accepted: 31 Aug 2011
First published: 14 Oct 2011

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Nanoscale, 2011,3, 4706-4712

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Strong photo-response in a flip-chip nanowire p-Cu₂O/n-ZnO junction

M. Deo, S. Mujawar, O. Game, A. Yengantiwar, A. Banpurkar, S. Kulkarni, J. Jog and S. Ogale, Nanoscale, 2011, 3, 4706 DOI: 10.1039/C1NR10665A

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