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4-Tert-butylpyridine-assisted low-cost and soluble copper phthalocyanine as dopant-free hole transport layer for efficient Pb- and Sn-based perovskite solar cells

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Abstract

The preparation of suitable hole transport material (HTM) is critical to the performance and stability of perovskite solar cells (PSCs) with low-cost. Herein, a mass producible and soluble copper phthalocyanine decorated with butoxy donor groups (CuPc-OBu) was designed as HTM and prepared by a facile two-step synthetic route. To generate high quality HTM film, 4-tertbutylpyridine (tBP) was doped into CuPc-OBu to prepare the film and then removed by annealing. Such a tBP-assisted strategy resulted in the best efficiency of the PSCs with lead trihalide perovskite up to 19.0% (small-area of 0.1 cm2) and 10.1% (the active area of 8.0 cm2 for the module device). And the best efficiency of the tin-based PSCs with CuPc-OBu reached to 6.9%. More importantly, the device with CuPc-OBu as HTM revealed the remarkably enhanced stability. This work provides a new strategy to improve the film-quality of free-doping HTMs and enhance the efficiency and stability of Pb- and Sn-based PSCs with low-cost.

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Acknowledgements

We acknowledge the National Natural Science Foundation of China (21801104 and 21871121), the Fundamental Research Funds for the Central Universities of China (lzujbky-2019-sp01 and lzujbky-2018-ot01), and the Special Fund Project of Guiding Scientific and Technological Innovation Development of Gansu Province (2019ZX-04).

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  1. These authors contributed equally to this work.

Authors and Affiliations

  1. State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China

    Chunling Li, Jing Cao & Yu Tang

  2. Pen-Tung Sah Institute of Micro-Nano Science and Technology, Xiamen University, Xiamen, 361005, China

    Ruiqin He & Jun Yin

  3. Key Laboratory of Chemistry of Northwestern Plant Resources and Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Qing Liang

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  1. Chunling Li
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  2. Ruiqin He
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  3. Qing Liang
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  4. Jing Cao
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  5. Jun Yin
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  6. Yu Tang
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Correspondence to Jing Cao, Jun Yin or Yu Tang.

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4-Tert-butylpyridine-Assisted low-cost and soluble Copper Phthalocyanine as Dopant-Free Hole Transport layer for Efficient Pb- and Sn-based Perovskite Solar Cellss

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Li, C., He, R., Liang, Q. et al. 4-Tert-butylpyridine-assisted low-cost and soluble copper phthalocyanine as dopant-free hole transport layer for efficient Pb- and Sn-based perovskite solar cells. Sci. China Chem. 63, 1053–1058 (2020). https://doi.org/10.1007/s11426-020-9725-3

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