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Volume 6

Research & Reviews: Journal of Material Sciences

ISSN: 2321-6212

Advanced Materials 2018

September 04-06, 2018

September 04-06, 2018 | Zürich, Switzerland

International Conference on

Advanced Materials & Nanotechnology

Energy efficient CuO-ZnO heterojunction nanocomposite: Study of band gap tuning, energy band

alignment and photo-induced charge transfer mechanisms

Gautam S K, Malik M, Jyotsna S

and

Poddar P

National Chemical Laboratory-CSIR, India

xide-semiconductor based heterojunction nanocomposites (HNCs) have garnered enormous research interest worldwide

and exhibited progressively advanced features such as effective separation of photo generated electron hole pairs for their

auspicious adoption in photovoltaic, photocatalytic and optoelectronic applications. Great emphasis has been paid to fulfill

the objectives of HNCs by synthesizing nanocrystalline narrow band gap p-type copper oxide with wide band gap n-type zinc

oxide using sol-gel technique. The structural, optical and electronic properties of developed HNCs were studied using X-ray

diffraction, micro-Raman spectroscopy, high resolution transmission electron microscopy (HRTEM), photo-luminescence

spectroscopy and X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) techniques.

Results revealed that Cu doping concentration upto 5% remains within the solubility limit of ZnO however, the higher Cu-

doping concentration leads to formation of ZnO-CuO HNCs. Cu-doping decreases ZnO band gap by introducing impurity

energy levels and exhibits absorption in visible region of electromagnetic radiation. The crucial information of local electronic

structures has been understood in terms of the hybridized electronic states and variation of valence band maxima with respect

to Fermi level with increasing the Cu-doping in ZnO-CuO HNCs. The enhanced photocatalytic activities and efficient charge

transfer mechanism in ZnO/CuO HNCs are rationalized and studied in terms of band gap tuning, energy band alignment and

charge migration at ZnO/CuO heterojunction interfaces. Detailed results will be presented.

Res. Rev. J Mat. Sci. 2018, Volume 6

DOI: 10.4172/2321-6212-C3-021