| 초록 |
We developed PP-TPD, based on a phenanthro[1,10,9,8-cdefg]carbazole unit as a donor and a thieno[3,4-c]pyrrole-4,6-dione(TPD) unit as an acceptor for efficient bulk heterojunction(BHJ) photovoltaics. The copolymer achieves a relatively low bandgap by its internal charge-transfer, which concurs with the results of density functional theory(DFT) calculation for the distribution of HOMO and LUMO levels. In addition, we fabricated the BHJ photovoltaics as a function of the blend ratio of the donor(PP-TPD) and acceptor(PC70BM), and applied a solvent additive and an interlayer to the device, with the optimized ratio used in this study. To comprehend the relationships between the device performance and the synergetic effects of 1,8-diiodooctane(DIO) and titanium oxide(TiOx) within the PP-TPD:PC70BM blends, we investigated the hole mobility related to the charge carrier transport, the charge generation, and the charge transport resistance using eletrical analysis. |
