| Summary: | 碩士 === 國立交通大學 === 材料科學與工程學系 === 99 === In this thesis, we fabricated devices with four novel main chain donor -acceptor conjugated polymers, named PT6TPD,PT8TPD,PCPDTTPD, and PDTSTPD. Because of the presence of the electron-deficient thieno[3,4-c]pyrrole-4,6-dione (TPD) moieties, these polymers exhibited an excellent thermal stability, crystalline characteristics, a broad spectral absorption, and a low-lying HOMO energy level—all features that are desirable for solar cell applications.
In order to obtain good performance of the solar cells, fabricating methods and parameters have to be processed carefully, including the choice of solvent, the blending composition between polymer and fullerene, the temperature and time of heat treatment, substituting PC71BM over PCBM, and the choice of additive. All the processes could affect the morphology of active layer, and lead to better power conversion efficiency.
Modulating the morphologies of the blends allowed us to optimize devices based on these polymer:PC71BM blends. All the optimized blends were dissolved in DCB and annealing at 90℃ for 20 minutes. The solar cell devices prepared by PT6TPD, PT8TPD, and PDTSTPD blended with PC71BM at a ratio of 1:1 and processed with 4 vol% DIO exhibited power conversion efficiency of 2.56%, 2.21%, 3.45%, separately. Another device incorporating PCPDTTPD and PC71BM (blend weight ratio, 1:4), with 3 vol% CN exhibited power conversion efficiency of 2.15%.
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