Fabrication and characterization of copper oxide-silicon nanowire heterojunction photodiodes

Mulazimoglu, Emre
Ünalan, Hüsnü Emrah
Turan, Raşit
In this study, copper oxide (CuO) thin film/silicon (Si) nanowire heterojunctions have been fabricated and their optoelectronic performances have been investigated. Vertically aligned n-type Si nanowires have been fabricated using metal-assisted etching (MAE) technique. CuO thin films were synthesized by the sol-gel method and deposited onto the nanowires through spin-coating. Fabricated nanowire heterojunction devices exhibited excellent diode behaviour compared to the planar heterojunction control device. The rectification ratios were found to be 105 and 101 for nanowire and planar heterojunctions, respectively. The improved electrical properties and photosensitivity of the nanowire heterojunction diode was observed, which was related to the three-dimensional nature of the interface between the Si nanowires and the CuO film. Results obtained in this work reveal the potential of Si nanowire-based heterojunctions for various optoelectronic devices.


Determination of current transport characteristics in Au-Cu/CuO/n-Si Schottky diodes
Surucu, O. Bayrakli; Güllü, Hasan Hüseyin; Terlemezoglu, M.; Yildiz, D. E.; Parlak, M. (Elsevier BV, 2019-10-01)
In this study, the material properties of CuO thin films fabricated by sputtering technique and electrical properties of CuO/n-Si structure were reported. Temperature-dependent current-voltage (I-V) measurement was carried out to determine the detail electrical characteristics of this structure. The anomaly in thermionic emission (TE) model related to barrier height inhomogeneity at the interface was obtained from the forward bias I-V analysis. The current transport mechanism at the junction was determined ...
Sequential Deposition of Electrochromic MoO3 Thin Films with High Coloration Efficiency and Stability
Turel, Onur; Hacioglu, Serife O.; Coskun, Sahin; Toppare, Levent Kamil; Ünalan, Hüsnü Emrah (The Electrochemical Society, 2017-01-01)
Effect of thin film deposition route on the morphology and performance of molybdenum oxide (MoO3) based electrochromic devices was investigated. For the deposition of thin films, a sequential deposition method, which includes ultrasonic spray pyrolysis (USP) and thermal evaporation methods was used. Films deposited solely using either USP or thermal evaporation method were used as control samples. Following deposition, MoO3 thin films were then characterized using X-ray diffraction, X-ray photoelectron spec...
Electrical, photo-electrical, optical and structural properties of CdSe thin films deposited by thermal and e-beam techniques
Hus, S. M.; Parlak, Mehmet (IOP Publishing, 2008-02-07)
In this study, electrical, photo-electrical, optical and structural analyses of CdSe thin films deposited by thermal and e-beam evaporation techniques were carried out by measuring temperature dependent conductivity, mobility, photoconductivity under different illumination intensity, photoresponse, transmission and x-ray diffraction. As a result of these measurements, it was observed that the films deposited by the thermal evaporation technique have room temperature conductivity values approximately three o...
Electrical and photoelectrical properties of Ag-In-Se thin films evaporated by e-beam technique
ÇOLAKOĞLU, Tahir; Parlak, Mehmet (IOP Publishing, 2009-02-07)
In this study, the electrical and photoelectrical properties of the Ag-In-Se thin films deposited by the e-beam technique have been investigated by carrying out temperature dependent conductivity, photoconductivity under different illumination intensities and photoresponse measurements between 380 and 1050 nm, as a function of annealing temperature. The measured conductivity values of the films at room temperature depending on the annealing temperatures vary in the range 1.9 x 10(-6)-5.2 Omega(-1) cm(-1). A...
Photo-stimulated luminescence of calcium co-doped BaFBr : Eu2+ x-ray storage phosphors
SCHLAPP, M; Bulur, Enver; VON SEGGERN, H (IOP Publishing, 2003-01-21)
The influence of calcium co-doping on the optical properties of the x-ray storage phosphor BaFBr: Eu2+, is determined by photo- stimulated luminescence techniques. It is found that the incorporation of calcium into the lattice results in a broadening of the photo- stimulation peak due to a calcium induced FA(Br, Ca2+)-centre with stimulation maxima at 540 and 680 nm. The optical cross-sections for the photo- stimulated process are determined by utilizing stimulation light with linearly increasing intensity....
Citation Formats
G. AKGÜL, F. AKSOY, E. Mulazimoglu, H. E. Ünalan, and R. Turan, “Fabrication and characterization of copper oxide-silicon nanowire heterojunction photodiodes,” JOURNAL OF PHYSICS D-APPLIED PHYSICS, pp. 0–0, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48301.