Controllable Synthesis of Cu2In2ZnS5 Nano/Microcrystals and Hierarchical Films and Applications in Dye-Sensitized Solar Cells

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• 作者：Yufeng Liu ; Fuqiang Huang ; Yian Xie ; Houlei Cui ; Wei Zhao ; Chongyin Yang ; Ning Dai
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：May 23, 2013
• 年：2013
• 卷：117
• 期：20
• 页码：10296-10301
• 全文大小：371K
• 年卷期：v.117,no.20(May 23, 2013)
• ISSN：1932-7455

文摘

Cu₂In₂ZnS₅ microcrystals with controllable nanostructures are synthesized via a facile solvothermal method. The microcrystals consist of numerous nanorods packed along a preferred crystal orientation. The crystal size of Cu₂In₂ZnS₅ is tunable into the nanoscale. Cu₂In₂ZnS₅ nanocrystals are composed of nanoparticles with an average size of 4.2 nm. Moreover, microcrystals were assembled on a molybdenum substrate to form a Cu₂In₂ZnS₅ thin film with a hierarchical architecture. The hierarchical nanostructure benefits to increase the optical path, decrease the reflection to capture photons effectively, and provide multiple channels for directly transferring charges to the conducting substrate. The hierarchical thin films were exploited as counter electrodes of dye-sensitized solar cells, which enhanced the catalytic activity of the counter electrode. The power conversion efficiency reached up to 6.1%, comparable to that of the dye-sensitized solar cells with a Pt counter electrode.