Journal
SMALL
Volume 18, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202104060
Keywords
photothermal stability; rylene-fullerene hybrids; surface tension regulation; ternary organic solar cells
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Funding
- National Natural Science Foundation of China [21734009, 21790361, 51903136]
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This study explores the use of unique molecular structure PDIs as the third component for PM6:Y6-based organic solar cells, with one hybrid, S-Fuller-PMI, significantly improving the fill factor and power conversion efficiency of ternary solar cells compared to binary ones. The enhanced electron mobility and tailored compatibility of S-Fuller-PMI with Y6 contribute to improved charge separation and transport, while the suppressed traps and increased entropy effect ensure long-term stability of the ternary OSCs.
Molecular carbon imides, especially extended perylene diimides (PDIs) have been the best wide-band-gap nonfullerene acceptors. Despite their excellent photothermal/chemical stability, flexible reaction sites, and unique photoelectronic properties, there is still a lack of fundamental understanding of their molecular characteristics as a third component. Here, generations of PDIs with distinctive molecular architecture, are deliberately screened out as the third component to PM6:Y6. Only a rylene-fullerene hybrid, S-Fuller-PMI, surprisingly boosts the fill factor (FF) of ternary organic solar cells (OSCs) to 0.77 from 0.72 for PM6:Y6 binary ones, and therefore the power conversion efficiency (PCE) of ternary cells is enhanced from 15.3% to 16.2%. Compared with highly-flexible rylene dimer and rigid multimer, S-Fuller-PMI exhibits higher electron mobility, favorable surface tension, and, therefore tailored compatibility with Y6. These formed Y6:S-Fuller-PMI alloys play as a morphological controller to improve charge separation and transport process. Simultaneously, the suppressed photothermal-induced traps, along with inherent enlarged entropy effect, endow the ternary OSCs still with approximate to 70% of initial PCE even after 500 h continuous illumination, whereas only 53% is left in their binary counterparts. These results provide new insight into the molecular design principle for distinctive molecular carbon imides as the third component for efficient and durable PM6:Y6-based OSCs.
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