| Summary: | 碩士 === 國立交通大學 === 材料科學與工程學系所 === 106 === In this study, in order to explore extended side chain structure effects on two dimensional conjugated polymer, a series of donor－acceptor (D－A) conjugated polymers: P2(PBDTOEHBO)、P3(PBDTTEHBO)、P4(PBDTBTEHBO)、P5(PBDTTPEHBO)、P6(PBDTTTEHBO) were synthesized. In the polymer, several different structures of two dimensional -BDT were used as donor building block, and a new structure of acceptor building block was designed. The physical, chemical, photovoltaic, structural packing, and morphological properties of polymers were characterized in this research.
Among these polymers, P5、P6 exhibit wider UV−vis absorption range. This
result clearly indicates that the light-harvesting properties of the parent conjugated polymers could be improved by introducing chromophoric side chains to broaden its absorption range and maximize overlap with the solar emission spectrum. The organic solar cell open circuit voltage (Voc) of P5、P6 are 0.88V and 0.79V respectively, and the shortcut current (Jsc) are 11.04 mA/cm2 and 11.56 mA/cm2 respectively.
The power conversion efficiency (PCE) of P5 achieves 4.3%, P6 achieves 4.8%.
The power conversion efficiency can be further improved through designing other structures of acceptor, selecting suitable solvent to enhance polymer solubility, and increasing crystallinity by thermal annealing.
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