| 초록 |
For efficient colloidal quantum dot (CQD) solar cells, thiol-passivated CQD is generally used as a hole-transporting material (HTM), but there are difficult issues on control of optoelectrical properties, low thiol passivation rate showing the PCE of around 11%. Here, we synthesize a novel benzodifuran (BDF) based HTM (asy-ranPBTBDF) showing electron-deficient state, low steric hindrance, and low planarity compared to typical benzodithiophene (BDT) based HTM (asy-ranPBTBDT). The BDF properties led to deep HOMO levels, close π-π stacking, excellent solubility, and amorphous property related to efficiency, green-solvent processability, and thermal stability. With these benefits, the asy-ranPBTBDF-based CQD solar cells showed enhanced open circuit voltage (VOC) (0.65 V) and PCE (13.16 %) compared to those (0.63 V and 12.35%) of asy-ranPBTBDT. |
