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On the electrochemical synthesis and characterization of p-Cu2O/n-ZnO heterojunction
- Source :
- Journal of Alloys and Compounds. 718:36-45
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
Abstract
- A p-Cu 2 O/n-ZnO heterojunction was grown directly on fluorine-doped tin oxide (FTO) substrate by two-step electrodeposition in aqueous solution. The electrical characteristics of the p-Cu 2 O/FTO and n-ZnO/FTO were studied using the Mott-Schottky (M-S) analysis in the electrolyte solution. High donor and acceptor concentrations were obtained for ZnO and Cu 2 O layers, respectively. The p-Cu 2 O/n-ZnO heterojunction show long electron lifetime and high electron–hole separation efficiency according to the electrochemical impedance spectroscopy (EIS) measurements and photocurrent response. The morphological, structural, optical, and electrical characteristics of p-Cu 2 O/n-ZnO heterojunction were investigated by field emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray diffraction (XRD), UV–Vis and photoluminescence (PL) analysis. The FE-SEM cross-section images confirm the formation of well-defined cubic Cu 2 O grains on continuous and flat surface of ZnO layer. XRD result points to high crystallinity of (111)-oriented p-Cu 2 O layer on (101)-oriented n-ZnO layer. The optical band gap energies of n-ZnO and p-Cu 2 O thin film are 3.3 and 2.3 eV, respectively. The current–voltage (I–V) characteristics of Au/p-Cu 2 O/n-ZnO/FTO heterojunction shows well-defined rectifying behavior with turn on voltage of 0.5 V in dark and high photoresponse under illumination.
- Subjects :
- Photocurrent
Photoluminescence
Materials science
Band gap
Mechanical Engineering
Metals and Alloys
Analytical chemistry
Heterojunction
02 engineering and technology
Substrate (electronics)
010402 general chemistry
021001 nanoscience & nanotechnology
Tin oxide
01 natural sciences
0104 chemical sciences
Dielectric spectroscopy
Mechanics of Materials
Materials Chemistry
Thin film
0210 nano-technology
Subjects
Details
- ISSN :
- 09258388
- Volume :
- 718
- Database :
- OpenAIRE
- Journal :
- Journal of Alloys and Compounds
- Accession number :
- edsair.doi...........8e0b06c27823d9e9bb76990a14b87119