Abstract
Poor stability of spiro-OMeTAD hole transport materials (HTM) with dopant is a major obstacle for the commercialization of perovskite solar cell (pero-SC). Herein, we demonstrate a series of quinoxaline-based D-A copolymers PBQ5, PBQ6 and PBQ10 as the dopant-free polymer HTMs for high performance pero-SCs. The D-A copolymers are composed of fluorothienyl benzodithiophene (BDTT) as D-unit, difluoroquinoxaline (DFQ) with different side chains as A-unit, and thiophene as π-bridge, where the side chains on the DFQ unit are bi-alkyl for PBQ5, bi-alkyl-fluorothienyl for PBQ6, and alkoxyl for PBQ10. All the three copolymers are adopted as the dopant-free HTM in the pero-SCs. The planar n-i-p structured pero-SCs based on (FAP-bI3)0.98(MAPbBr3)0.02 with PBQ6 HTM demonstrated the high power conversion efficiency (PCE) of 22.6% with Voc of 1.13 V and FF of 80.8%, which is benefitted from the suitable energy level and high hole mobility of PBQ6. The PCE of 22.6% is the highest efficiency reported in the n-i-p structured pero-SCs based on dopant-free D-A copolymer HTM. In addition, the pero-SCs show significantly enhanced ambient, thermal and light-soaking stability compared with the devices with traditional spiro-OMeTAD HTM.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (2019YFA0705900), the National Natural Science Foundation of China (51820105003, 21734008, 61904181) and the Guangdong Major Project of Basic and Applied Basic Research (2019B030302007). We thank Dr. Xian Wang from Analytical Instrumentation Center in ICCAS for the measurements of emission life-times.
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Lu, C., Zhu, C., Meng, L. et al. Stable perovskite solar cells with efficiency of 22.6% via quinoxaline-based polymeric hole transport material. Sci. China Chem. 64, 2035–2044 (2021). https://doi.org/10.1007/s11426-021-1084-y
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DOI: https://doi.org/10.1007/s11426-021-1084-y