논문 해외 국제전문학술지(SCI급) Solvent effect of the fibrillar morphology on the power conversion efficiency of a polymer photovoltaic cell in a diffusive heterojunction
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2012
- 저자명 S.M. Cho, J.-H. Bae, E. Jang, M.-H. Kim, C. Lee, and S.-D. Lee
- 학술지명 Semiconductor Science and Technology
- 발행처명 ResearchGate
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
We describe the solvent-dependent morphology of a conjugated polymer, poly(3-hexylthiophene) (P3HT) interfaced with [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) and the evolution of the resulting inter-connected fibrillar structure (ICFS) in a diffusive bilayer heterojunction (DBHJ). It is found that the fibrillar structure of the P3HT is preferentially developed in a poor solvent and less soluble than an amorphous structure and the ICFS improves the power conversion efficiency (ηp) significantly. Among four different solvents chlorobenzene, dichlorobenzene, chloroform and p-xylene studied, p-xylene results in ηp ≈ 3% whereas chlorobenzene yields only 0.5%. This indicates clearly that the formation of the ICFS plays a critical role to induce high exciton generation/dissociation to produce spatially uninterrupted pathways for the charge transport, and to enhance ηp of a polymer photovoltaic device in the DBHJ configuration.