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Carbon nanodots enhanced performance of Cs0.15FA0.85PbI3 perovskite solar cells

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Abstract

A high-quality hybrid Cs0.15FA0.85PbI3 thin film is deposited through doping of carbon nanodots (CNDs) into perovskite precursor solution. The corresponding inverted planar perovskite solar cells (PSCs) of ITO/PTAA/Cs0.15FA0.85PbI3/PC61BM/BCP/Ag exhibit an improvement in efficiency from 17.36% to 20.06%, which could be attributed to the passivation of the defects at the crystallized perovskite thin film and enhanced perovskite phase uniformity. The results of electron trap density indicate that the addition of CNDs significantly reduces the defects density at the perovskite thin film and the recombination of charge carriers in transport process is minimized. These results demonstrate that low-cost CNDs are effective additives for passivating defects, further reducing charge carrier recombination and improving device efficiency.

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Acknowledgements

This work was supported by Shenzhen Science and Technology Innovation Committee (No. JCYJ20190809172615277) and China Postdoctoral Science Foundation (No. 2019TQ0163). This project was financially also supported by Shenzhen Municipal Development and Reform Commission, New Energy Technology Engineering Laboratory (No. SDRC [2016]172).

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Authors and Affiliations

  1. Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen, 518000, China

    Yu Gao, Wenzhan Xu, Fang He, Pengbo Nie & Guodan Wei

  2. Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, 518000, China

    Yu Gao, Wenzhan Xu, Fang He, Pengbo Nie, Zhichun Si & Guodan Wei

  3. School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510080, China

    Qingdan Yang

  4. Peking University Shenzhen Graduate School, Peking University, Shenzhen, 518055, China

    Hong Meng

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  1. Yu Gao
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  2. Wenzhan Xu
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  3. Fang He
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Gao, Y., Xu, W., He, F. et al. Carbon nanodots enhanced performance of Cs0.15FA0.85PbI3 perovskite solar cells. Nano Res. 14, 2294–2300 (2021). https://doi.org/10.1007/s12274-020-3224-8

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