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3645 |
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Preparation of nano-micro-porous TiO2 coating by vacuum cold spray as photoanode for all-solid-state dye-sensitized solar cells |
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Guan-Jun Yang* / School of Materials Science and Engineering, Xi'an Jiaotong University, China Yan Li / State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China Cheng-Xin Li/ State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China Chang-Jiu Li/ State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, China |
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For the successful fabrication of low cost and environment friendly all-solid-state dye-sensitized solar cells, the infiltration of solid electrolyte material into the porous photoanode coating is a key issue. In order to improve the electrolyte infiltration, both nano-pores and micro-pores were introduced into the coating through vacuum cold spray using a composite feedstock powder composed of both nano-sized TiO2 particles and micro-sized polystyrene (PS) microspheres (with different diameters from 100 nm to 5 um). Results show that the PS microspheres deposited in the coating at room temperature can be removed by the heat treatment at 200oC for 2 h and subsequently the micro-sized pores were formed. The addition of the micro-sized pores into the conventional nano-sized pore network promotes the infiltration of electrolyte into the porous coating. As a result, a high photo-to-electric energy conversion efficiency is achieved. |