1. Tuning the Energy Level of Organic Sensitizers for Dye-sensitized Solar Cell. The Study in Morphology of Coordination Polymer Particles
Date Issued
2009
Date
2009
Author(s)
Chen, Ching-Ting
Abstract
Cost-effective organic sensitizers will play an important role in the future large-scale production and application of dye-sensitized solar cells. A new organic dye 1 featuring Salen Schiff base core has synthesized via sonogashira coupling reaction and imination. The Salen core can coordinate with metal, which would lower the LUMO and result red shift in absorption. 1 and Zn(II)/1 sensitized solar cells yield a short-circuit photocurrent density of 2.51 and 0.49 mA/cm2, an open-circuit voltage of 654 and 734 mV, and a fill factor of 0.72 and 0.67, corresponding to an overall conversion efficiency of 1.20% and 0.24% under standard AM 1.5 sun light, respectively. The metal which coordinates to Salen core might bind to the carboxylic acid, which plays the role of anchoring group. This would interfere in the dye absorption on TiO2, which resulted in a terrible performance in dye-sensitized solar cell. However, solar cell performances are not solely driven by the energy levels of the materials. Clearly, the molecular weight and the overall organization of dyes are other important key parameters to consider when developing new dye for solar cells. Coordination polymer particles (CPPs) were synthesized by a simple solvothermal reaction of Zinc acetate and N,N’-dicyanoethenebis (salicylideneimine)dicarboxylic acid in dimethyl sulfoxide or dimethyl formaide. The growth mechanism was investigated by time-dependent scanning electron microscope. And the factors, solvents and cis-trans isomerization, which would vary the particle size and conformations, were studied.
Subjects
dye
solar cell
coordination polymer
morphology
Type
thesis
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