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Enhancing hole extraction via carbon nanotubes/poly(3-hexylthiophene) composite for carbon-based CsPbI2Br solar cells with a new record efficiency

碳纳米管/聚三己基噻吩复合材料增强空穴提取助力碳基CsPbI2Br太阳电池实现新的记录效率

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Abstract

Carbon-based perovskite solar cells (C-PSCs) benefit from the chemical inertness and hydrophobicity of carbon electrodes, resulting in high stability. Generally, C-PSCs have lower photovoltaic performance than metal electrode-based ones. This is primarily attributed to the low hole extraction efficiency at the interface between the perovskite and the carbon electrode. We synthesized a carbon nanotube/poly(3-hexylthiophene) (CNT/P3HT, denoted as CP) composite as a hole transport material to construct the state-of-the-art C-PSCs. The strong π-π interaction between P3HT and CNTs increases P3HT crystallinity and improves CNT dispersibility. Compared with pure P3HT, CNT in the CP composite provides a high-speed channel for hole transmission, lowering charge transmission impedance and improving hole extraction efficiency. This CP composite was used to assemble CsPbI2Br C-PSCs, resulting in increases in open-circuit voltage from 1.233 to 1.355 V and power conversion efficiency from 13.29% to 15.56%, a new record for all-inorganic perovskite C-PSCs.

摘要

碳基钙钛矿太阳电池(C-PSCs)具有低成本和高稳定性的优势, 这归因于碳电极的化学惰性和疏水性. 然而, C-PSCs的光伏性能通常低于相应的金属电极器件, 其中最重要的原因是钙钛矿层和碳电极之间低的空穴提取效率. 这里, 我们发展了一种基于碳纳米管/聚三己基噻吩(CNT/P3HT, CP)复合材料的空穴传输材料用于构建C-PSCs. P3HT和CNTs之间的强相互作用力增强了P3HT的结晶度, 同时也改善了CNTs的分散性. 相比于纯P3HT, CP复合材料中的CNT提供了空穴传输的高速通道, 进而有效地降低电荷传输阻抗和改善空穴提取效率. 这种CP复合材料被用于组装CsPbI2Br C-PSCs, 其光电压由1.233 V提高到1.355 V, 能量转换效率也由13.29%提高到15.56%, 刷新了碳基全无机钙钛矿太阳电池的记录.

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Acknowledgements

This work was supported by Guangdong Laboratory for Lingnan Modern Agriculture (NZ2021030) and the National Natural Science Foundation of China (21975083, U21A20310, 51732004, 22122805, and 22075090).

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Authors and Affiliations

  1. Key Laboratory for Biobased Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China

    Guizhi Zhang  (张桂芝), Jianxin Zhang  (张键鑫), Zhenxiao Pan  (潘振晓), Huashang Rao  (饶华商) & Xinhua Zhong  (钟新华)

  2. Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China

    Guizhi Zhang  (张桂芝), Zhenxiao Pan  (潘振晓), Huashang Rao  (饶华商) & Xinhua Zhong  (钟新华)

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  1. Guizhi Zhang  (张桂芝)
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  2. Jianxin Zhang  (张键鑫)
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  3. Zhenxiao Pan  (潘振晓)
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  4. Huashang Rao  (饶华商)
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  5. Xinhua Zhong  (钟新华)
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Contributions

Zhang G and Rao H conceived and designed the experiment. Zhang G carried out the sample preparation and solar cell fabrication. Zhang G and Zhang J conducted characterizations. All authors contributed to the general discussion.

Corresponding author

Correspondence to Huashang Rao  (饶华商).

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Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary information

Experimental details and supporting data are available in the online version of the paper.

Guizhi Zhang is pursuing a PhD degree at the South China Agricultural University (SCAU). She received her Master’s degree from Sun Yat-sen University (SYSU) and her Bachelor’s degree from the Northwest Normal University (NWNU). Her primary research is focused on carbon-based perovskite solar cells.

Huashang Rao is an associate professor at SCAU. He received his PhD and BS degrees from SYSU. His research focuses on lead halide perovskite materials and devices, particularly carbon-based perovskite solar cells.

Supplementary Information

40843_2022_2343_MOESM1_ESM.pdf

Enhancing hole extraction via carbon nanotubes/poly(3-hexylthiophene) composite for carbon-based CsPbI2Br solar cells with a new record efficiency

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Zhang, G., Zhang, J., Pan, Z. et al. Enhancing hole extraction via carbon nanotubes/poly(3-hexylthiophene) composite for carbon-based CsPbI2Br solar cells with a new record efficiency. Sci. China Mater. 66, 1727–1735 (2023). https://doi.org/10.1007/s40843-022-2343-7

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