Interface engineering for high efficient non-fullerene polymer solar cells
발표자
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초록
내용
In current, the low-conductivity PEDOT:PSS is mainly utilized in contemporary solar cells. Thus, the contact between ITO and PEDOT:PSS is not ohmic anymore. Despite the high possibility that there are serious interface problems, little attention has been paid to the interface between PEDOT:PSS and ITO. In this work, we have employed a conjugated polyelectrolyte (WPFSCz-) between ITO and low-σ PEDOT:PSS to overcome organic-inorganic interfacial problems. Insertion of the WPFSCz- layer provides substantial advantages in the operation of the polymer solar cells. First, WPFSCz- layer modifies the work-function of the ITO, thereby forming effective cascading energy alignment. Second, the WPFSCz- layer eliminates interfacial trap sites, resulting in an improvement of fill factor. These effects result in a significant increase in the efficiency of non-fullerene solar cells based on PM6 and Y6, from 15.86 to 17.34%.