| Summary: | 博士 === 國立臺灣大學 === 化學研究所 === 103 === The solar cell has been recognized as a promising future source of affordable renewable energy to address global energy needs and environmental concerns. Consistent improvements in developing organic solar-energy harvesting materials for organic photovoltaics (OPVs) and dye-sensitized solar cells (DSSCs) have been motivated in part with the advantage of low-cost, lightness, and flexibility over conventional inorganic silicon-type counterparts. Significant advancements in organic small-molecule OPVs recently have made them an attractive alternative with the eminent advantages of high batch-to-batch reproducibility, broad and red-shifted absorption in the light-harvesting region and monodispersity with well-defined chemical structures.
This dissertation discloses the special chemical-structure considerations needed to realize efficient solar cells, including new organic frameworks for enhancing absorption response and results of multidisciplinary studies ranging from molecular-level chemical-structure to materials science and device engineering. Chapter 1 provides a brief overview to disentangle the regioisomeric effects on electronic features of organic sensitizers for DSSCs. Chapter 2 presents the design principle of an asymmetric framewok for small-molecule donors and their applications in vacuum-deposited OPVs. Chapter 3 comprises the syntheses and characterization of both asymmetric, symmetric small-molecules and oligomeric molecules for solution-processed OPVs. These efforts deal with the judicious design of p-type low-bandgap organic materials and the exploration of structure-property-processing-performance relationship.
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