Abstract
We developed novel fluorine and nitro-containing stilbene-linked carbazole-based fullerene (C60) derivatives for bulk heterojunction organic solar cells (BHJ-OSCs). The synthesized fullerene derivatives (FCzC61BM and NCzC61BM) have hexyl chains that possess good solubility in toluene and chlorobenzene organic solvents. The extended conjugation of FCzC61BM and NCzC61BM molecules showed broad absorption with strong absorption intensity. The FCzC61BM and NCzC61BM both have a low-lying lowest unoccupied molecular orbital (LUMO) level of − 3.70 eV and − 3.75 eV, respectively, due to extended conjugation with electron donor. These LUMO energy level was quite close to the donor (P3HT) LUMO energy level, which is essential for electron transport properties. The BHJ-OSC device was fabricated using FCzC61BM and NCzC61BM as the acceptors with commercially available P3HT donor materials using following configurations ITO/PEDOT:PSS/P3HT:acceptor/LiF/Al. The FCzC61BM-based device showed a maximum PCE of 0.86% with Jsc of 8.36 mA/cm2, Voc of 0.34 V and FF of 0.30. These findings clearly demonstrated that the inclusion of stilbene and carbazole in C60 acceptor derivatives exhibited superior optical and electrochemical properties, as well as photovoltaic performance. These findings will help to rationally design the new C60 acceptor for OSC applications in the near future.
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Acknowledgements
The authors are thankful to VIT University for providing laboratory facilities and VIT SIF for the spectral studies. The authors thank the DST for the financial support of this work through the SERB research grant (SERB-SB/FT/CS-185/2011) and Solar Energy Research Initiative (SERI) Programme (DST/TM/SERI/FR/172(G)).
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Sathiyan, G., Dasi, G., Ramasamy, S.K. et al. Stilbene-containing carbazole-based fullerene derivatives as alternative electron acceptor for efficient organic solar cells. Appl Nanosci 13, 4101–4108 (2023). https://doi.org/10.1007/s13204-022-02707-z
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DOI: https://doi.org/10.1007/s13204-022-02707-z