Efficiency Enhancement in Lead-Free AgBiS<sub>2</sub> Colloidal Nanocrystal/Organic Hybrid Solar Cells
발표자
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초록
내용
Colloidal quantum dots (CQDs) are promising materials for next-generation solar cells due to the fact that their optical and electrical properties can be controlled by varying quantum dot size or exchanging capping ligands. By utilizing surface chemistry modification of QDs 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 cells have been explored; however, toxicity remains a concern. AgBiS2 CQDs are a promising alternative to create environmentally friendly CQD solar cells. Here, we have introduced a thin interlayer of thiol ligand-exchanged AgBiS2 QDs in between active layer and polymer hole transport layer. This interlayer improved the solar cell figures of merit by enhancing charge transport from the active layer to hole transport layer, reaching power conversion efficiency of 9.1%.