Abstract
Water/alcohol soluble cathode interfacial materials (CIMs) are playing important roles in optoelectronic devices such as organic light emitting diodes, perovskite solar cells and organic solar cells (OSCs). Herein, n-doped solution-processable single-wall carbon nanotubes (SWCNTs)-containing CIMs for OSCs are developed by dispersing SWCNTs to the typical CIMs perylene diimide (PDI) derivatives PDIN and PDINO. The Raman and X-ray photoelectron spectroscopy (XPS) measurement results illustrate the n-doped behavior of SWCNTs by PDIN/PDINO in the blend CIMs. The blended and n-doped SWCNTs can tune the work function and enhance the conductivity of the PDI-derivative/SWCNT (PDI-CNT) composite CIMs, and the composite CIMs can regulate and down-shift the work function of cathode, reduce the charge recombination, improve the charge extraction rate and enhance photovoltaic performance of the OSCs. High power conversion efficiency (PCE) of 17.1% and 17.7% are obtained for the OSCs based on PM6:Y6 and ternary PM6:Y6:PC71BM respectively with the PDI-CNT composites CIMs. These results indicate that the n-doped SWCNT-containing composites, like other n-doped nanomaterials such as zero dimensional fullerenes and two dimensional graphenes, are excellent CIMs for OSCs and could find potential applications in other optoelectronic devices.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (91633301, 51863002, 51973042), the Excellent Young Scientific and Technological Talents of Guizhou, China (QKHPTRC[2019]5652) and the Cultivation and Innovation of New Academic Talents of Guizhou Institute of Technology (GZLGXM-05).
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Pan, F., Bai, S., Liu, T. et al. Single-wall carbon nanotube-containing cathode interfacial materials for high performance organic solar cells. Sci. China Chem. 64, 565–575 (2021). https://doi.org/10.1007/s11426-020-9917-6
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DOI: https://doi.org/10.1007/s11426-020-9917-6