| 초록 |
Solar cells using both colloidal quantum and polymer can harvest visible rays and near-infrared. To have a solution-processable property, future solar cells must be processed in green solvents. However, representative polymer hole transport layers(HTLs) nowadays can be only processed in hazardous solvents like chlorobenzene. This disrupts the attraction between polymer in p-type materials. Herein, we synthesized a random copolymer(asy-ranPBTBDT) which is soluble in 2-methylanisole(2-MA), the representative green solvent, to use by HTL in solar cells. The new polymer has a stronger π- π interaction compared to the reference polymer(asy-PBTBDT), which resulted in less charge recombination and enhanced stability. The device using new polymeric HTL exhibited a power conversion efficiency(PCE) of 13.2% and maintained 89% of its initial efficiency after 120 hours. |
