| 초록 |
Colloidal quantum dots (CQDs) are promising materials for next generation solar cells. With surface chemistry modification of CQDs through ligand exchange, better control over band energy alignment and improvement in charge extraction can be achieved. So far, surface passivation strategies for lead chalcogenide CQD solar cell had been well-researched; however, toxicity remains a concern. AgBiS2 CQDs are a promising alternative to create environmentally friendly CQD solar cells high absorption coefficient. So far, utilizing different capping ligands to create better band-energy alignment is a topic that haven’t been explored for AgBiS2 CQDs. Here, we modified the energy band of halide ligand-exchanged AgBiS2 QD active layer with thiol ligand treatment. This treatment created a better energy band alignment for the device, reaching power conversion efficiency of 7%. |
