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Fabrication and Photovoltaic Application of Hierarchical Hetero-nanostructures

Author: ChenXueZuo
Tutor: DuXiWen
School: Tianjin University
Course: Materials Science
Keywords: semiconductor sensitized solar cells (SSSCs) hierarchicalnanostructure CdS/ZnO green materials ZnFe2O4
CLC: TM914.4
Type: Master's thesis
Year: 2012
Downloads: 1
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Abstract


In this thesis, we surveyed the decisive factors for an excellent photoandoe ofsemiconductor sensitized solar cells （SSSCs）, and designed a structure of ZnO/CdShierarchical nanostructure. We developed a low-temperature process for facilesynthesis of ZnO/CdS hierarchical nanowires. Meanwhile, a green material, ZnFe2O4（ZFO）, was synthesized on carbon fibers. The main results are as follows:The ZnO nanowires were first prepared via a hydrothermal route and then thesecondary single-crystal CdS tips were grown on the ZnO nanowires byelectrochemical deposition, and the formation mechanism of CdS nanotips wasdiscussed in detail. The as-grown hierarchical ZnO/CdS nanowries are superior incharge separation as well as carrier transport, thus achieving higher open circuitvoltage, short circuit current and final conversion efficiency30%higher than thecommon coaxial nanocables with CdS nanocrystal shell on core ZnO nanowiresThe Fe2O3nanowires were synthetized on carbon fibers via a hydrothermal routefollowed by annealing treatment. Then Fe2O3nanowires were transferred into ZFOnanowires under high temperature, resulting in a ZFO/C hierarchical nanostructure.Though ZnO impurities were found existed in sample, we believe they can beeliminated by any chemical treatments. Such a structure is promising for theapplication in photovoltage area.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Photocell > Solar cells
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