Chemical Additives of Solution-Phase Ligand Exchange for Infrared Colloidal Quantum Dot Solar Cells
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초록
내용
Colloidal quantum dot (CQD) is one of the effective infrared absorbing materials for photovoltaic applications. For this applications, original insulating ligands used for the synthesis of CQD should be replaced in order to obtain electrically conductive CQD solid films with reduced recombination of photo-generated charge carriers. Recently, solution-phase ligand exchange has been considered as a promising strategy to realize the homogeneous exchange of surface ligand and the minimized density of defects. However, current solution-phase ligand exchanges have still reported insufficient optoelectrical and photophysical properties of CQDs for achieving high performance infrared solar cells. In this study, the solution-phase ligand exchange methods have been modified by introducing various chemical additives. And then, the influences of chemical additives on the photovoltaic performances have been explored by fabricating infrared CQD solar cells.