| Summary: | Organic photovoltaics (OPV) have the potential to utilize the solar energy in efficient and affordable ways and have attracted wide research interest over the world. Stille polycondensation is commonly used to synthesize conjugated polymers for OPV. In chapter 1, a general review was addressed on the versatile usage of Stille polycondensation in synthesizing functional polymers. However, the possible homo coupling side reaction of Stille polycondensation can affect the performance of resulting polymer a lot. Chapter 2 studied the effect of homo coupling byproduct on the photovoltaic performance of PTB7, a high-efficiency conjugated polymer. Chapter 3 developed the Stille condition to minimize the homo coupling and used the improved Stille condition to synthesize a series of molecules with well defined structure to study the aggregation behavior of conjugated polymer. To study the effect of conjugation size, Chapter 4 described a synthetic method for large linear heteroacenes, which were then used to synthesize conjugated polymers and the structure-property relationship of the polymers are studied. In Chapter 5, heteroacene oligomers with extended conjugation were synthesized and their electronic and optical properties were studied.
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