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Hydrothermal Synthesis of Branched ZnO Nanowire Array as an Effective Photoanode for Quantum-Dot-Sensitized Solar Cells

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Authors
강수지
Advisor
박병우
Major
공과대학 재료공학부
Issue Date
2014-02
Publisher
서울대학교 대학원
Keywords
Quantum-dot-sensitized solar cellZinc oxideNanowire arrayHierarchical structureLight trapping
Description
학위논문 (석사)-- 서울대학교 대학원 : 재료공학부, 2014. 2. 박병우.
Abstract
I have focused on the synthesis of branched ZnO nanowires and the understanding of the growth kinetics during my thesis. Furthermore, the branched ZnO nanowire array was introduced as a photoelectrode of a quantum-dot-sensitized solar cell, and the correlation between the nanostructures and solar cell performance was investigated in terms of both optical (light trapping) and electrical (charge recombination) characteristics.
Three-dimensional branched ZnO nanowires were synthesized by a seed-mediated hydrothermal growth. The fast growth-rate of (001) direction was possible due to the anisotropic nature of ZnO and the capping agents blocking a lateral growth of nanowire.
About two-fold enhancement of power conversion efficiency (PCE) was obtained by growing secondary branches, and both short-circuit current and open-circuit voltage were enhanced. Highly increased surface area of photoelectrode, resulting in higher light harvesting from increased quantum-dot loading amount, and the higher diffused reflectance was observed due to enhanced light-scattering of 3D structure. In addition, electrochemical impedance spectroscopy and open-circuit voltage decay revealed the reduced recombination and higher lifetime of branched ZnO nanowires.
Language
English
URI
http://hdl.handle.net/10371/123283
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Theses (Master's Degree_재료공학부)
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