고분자 태양전지를 위한 새로운 공액 고분자의 합성 및 태양전지 특성 평가

Abstract

Polymer solar cells have great potential for flexible polymeric electronic device because of their cost effective and light weight. The bulk heterojunction (BHJ) layers exhibit nanoscale mixing of the two components ensuring quantitative charge generation at the extended donor？acceptor interface whereas the bicontinuous nature allows effective charge collection. Low band gap energy is crucial factor for making efficient solar cell. To get low bad gap polymer, we introduced electron deficient anthraquinone derivative and electron rich dialkoxy benzene derivatives. The polymers are synthesized by the well-known Heck coupling reaction. The polymers based on anthraquinone and dialkoxy benzene have low band gap. ca. 2.10 eV. However, the efficiency of solar cell based the polymers are extremely low because the carbonyl group in the back-bone seem to be act as an exciton quenching site. In addition, we synthesized a series of low band gap polymers based dihexylfluorene, 2,1,3-benzothiadiazole, and dialkoxythiophene by the Suzuki coupling reaction. The efficiency of solar cells based on the low band gap polymers are ca. 0.3%. In this thesis, we report the synthesis and characterization of new polymer. The electrochemical, optical, photovoltaic properties of new polymers as well.