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Polymer Electrolytes for Solid-state Dye-sensitized Solar Cells and Their Photoelectrochemical Mechanism

Author: ZhangRenKai
Tutor: XueSong
School: Tianjin University of Technology
Course: Applied Chemistry
Keywords: solid-state polymer electrolyte solar cell electron recombination
CLC: TM914.4
Type: Master's thesis
Year: 2012
Downloads: 139
Quote: 0
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Abstract


Dye-sensitized solar cells(DSSCs) have received wide academic attention as a kind ofphotovoltaic device with low cost and easy fabrication.By virtue of non-volatility, easypackage and long-term stability, solid-state polymer electrolyte has become one of thesignificant research areas in DSSCs.In this study, a comb-like copolymer poly(N-propyl-vinylimidazoliumiodide-co-poly(ethylene glycol) methyl ether methacrylate) (poly(VImI-co-PEGMA)) wassynthesized. Quasi-solid state DSSCs were fabricated using the copolymer gel as theelectrolyte. Results show that chain segments with the imidazolium cations decrease electronrecombination at the TiO2/electrolyte interface effectively. Moreover, the copolymer not onlygives rise to the upward movements of the conduction band edge of TiO2, but also increasesthe transport resistance of TiO2film. Quasi-solid state DSSCs have obtained an energyconversion efficiency of 4.10% given that the weight fraction of the copolymer is 50% andthe mole ratio VImI to PEGMA is 5.0. In addition, all-solid-state DSSCs, prepared by usingthe copolymer/ PEO blend electrolyte, have received an energy conversion efficiency of3.46%.The WAX and DSC meseasurments indicate that the copolymer can decrease thecrystallinity of PEO and improve the ionic conductivity.All-solid-state DSSCs based on PEO /PEG blend electrolyte were assembled with theaddition of DMAP. Experiments were conducted for investgating the action mechanismbetween DMAP and TiO2surface. It is shown that DMAP significantly improve theopen-circuit voltage of DSSCs, owing to the interaction of DMAP and I3-/I-as well as themodification of the surface distribution of TiO2conduction band, through the analyses ofimpedance and photoelectrochemistry. The high open-circuit voltage of 0.85V is achieved,and the conversion efficiency reaches 4.07%.

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