Controllablein situphoto-assisted chemical deposition of CdSe quantum dots on ZnO/CdS nanorod arrays and its photovoltaic application

Abstract

Compound semiconductors have been widely applied in the energy field as light-harvesting materials, conducting substrates and other functional parts. Nevertheless, to effectively grow them in various forms toward objective applications, limitations have often been met to achieving high growth rate, simplicity of method and controllability of growing processes simultaneously. In this work, we have grown a uniform CdSe layer on ZnO/CdS nanorod arrays by a novel in situ photo-assisted chemical deposition method. The morphology and quality of the as-formed material could be significantly influenced by tuning the optical parameters of the injected light. Due to the effect of injected light on the key reactions during the growth, a modified natural light with removal of the UV and IR components seems to be more suitable than monochromic light. An efficiency of 3.59% was achieved without any additional treatment, significantly higher than the efficiency of 2.88% of the sample by conventional CBD method under similar conditions with growth rate one order of magnitude higher. In general, the result has suggested its potential importance for other compound materials and opto-electronic devices.

Modulating Zn(OH)2 Rods by Marine Alginate for Templates of Hybrid Tubes with Catalytic and Antimicrobial Properties

“…have attracted rapidly increasing interest in fabricating various novel materials, e.g. Au nanorods in sensing and detecting devices, and hybrid nanorod arrays of zinc oxide/cadmium sulfur in optoelectronic devices . Among them, rods of ZnO or Zn­(OH) 2 were paid particular attention as detectors, lighting devices, and sensitive antibody microassay, on account of their widely available raw materials, controllable morphologies, good solubility in acid/alkaline solutions, and unique electrochemical properties .…”

“…Au nanorods in sensing and detecting devices, 3 and hybrid nanorod arrays of zinc oxide/cadmium sulfur in optoelectronic devices. 4 Among them, rods of ZnO or Zn(OH) 2 were paid particular attention as detectors, lighting devices, and sensitive antibody microassay, 5 on account of their widely available raw materials, 6 controllable morphologies, 7 good solubility in acid/alkaline solutions, and unique electrochemical properties. 8 In spite of these fascinating newly discovered properties and emerging applications, it is still highly challenging to produce ZnO or Zn(OH) 2 rods in large scale along with uniform morphologies in environmentallyfriendly approaches.…”

Efficient anchoring of nanostructured cadmium selenide on different kinds of carbon nanotubes

“…CdSe nanoparticles and quantum dots (QDS) are of special interest; these nanostructures have tuneable absorption maxima [12] and may have applications as components in solar cells [13], photovoltaic devices [14], biomedical imaging agents [15], biochemical sensors [16] and laser emitting materials [17]. The use of selenourea as an alternative selenide precursor for the preparation of semiconducting nanoparticles and quantum dots using thermal or ultrasonic activation under aqueous basic or acidic conditions, has been previously explored for the preparation of several systems (CuInSe 2 , CdSe, Cu 3 Se 2 , ZnSe, PbSe, Bi 2 Se 3 ) [18][19][20][21][22][23][24][25].…”