| Summary: | 碩士 === 國立交通大學 === 理學院碩士在職專班應用科技學程 === 96 === Abstract
In this thesis, thiophene was used as a main molecular architecture to develop and synthesize a new type of crosslinkable conjugated conducting polymer for organic solar cell application. This new type crosslinkable conjugated conducting polymer has been synthesized successfully by Grignard method through metal-catalyzed cross coupling and SN2 substitution reactions. Ring opening reaction can proceed under the mixing of photo acid and crosslinkable conjugated conducting polymer to form the crosslinked conducting polymer. This crosslinked polymer can properly control the morphology of the blend of this conducting polymer material (donor) with PCBM(acceptor).
In this study, a series of identifications were carried out via NMR、GPC、FT-IR、UV and AFM. Synthesized products from each step were characterized by NMR analyses. The molecular weight was measured by GPC giving around 10000~19000 g/mol and a narrow molecular weight distribution. FT-IR was employed to monitor the ring opening reaction to demonstrate its crosslinkable reaction. UV-visible results showed that the amount of photo and annealing time have a great influence on the degree of crosslinking. AFM results indicated no phase separation for the blend of this crosslinked conjugated conducting polymer and PCBM.
Although the practical application of this obtained crosslinkable conjugated conducting polymer on the organic solar cell did not achieved the desired efficiency, however, the experimental results indicated that the efficiency can be improved further through the removal of the photo acid
by the washing process and the newly high temperature heating of the devices before packaging. In the future, if the optimal ratio of alkyl group to oxetane group can be determined, washing solvent and packaging adhesive can be further improved, this crosslinkable conjugated conducting polymer may possess good performance for future application in terms of device efficiency, stability and life time.
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