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Hierarchically Structured ZnO Nanorods as an Efficient Photoanode for Dye‐Sensitized Solar Cells
Author(s) -
Peng Wenqin,
Han Liyuan,
Wang Zhengming
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201402250
Subject(s) - nanorod , dye sensitized solar cell , materials science , photovoltaic system , nanoparticle , energy conversion efficiency , nanotechnology , light scattering , boosting (machine learning) , optoelectronics , chemical engineering , scattering , electrode , electrolyte , chemistry , optics , ecology , physics , engineering , machine learning , computer science , biology
Hierarchical ZnO nanorods composed of interconnected nanoparticles, which were synthesized by controlling precursor concentrations in a solvothermally assisted process, were exploited as photoanodes in dye‐sensitized solar cells (DSCs). The as‐prepared hierarchical nanorods showed greatly enhanced light scattering compared to ZnO nanoparticles for boosting light harvesting while maintaining sufficient dye‐adsorption capability. The charge‐transfer characteristics were studied by electrochemical impedance measurements, and reduced electron recombination and longer electron lifetime were observed for the ZnO nanorods. Photovoltaic characterization demonstrated that DSCs utilizing the hierarchical nanorods significantly improved the overall conversion efficiency by 34 % compared to nanoparticle‐based DSCs.