Improving carrier transport for stable and efficient perovskite solar cells via MXene-modified 2D perovskite capping layer

•The MXene-modified 2D perovskite capping layer was constructed on the 3D perovskite surface for the first time.•The interaction between MXene and perovskite enhances the carrier transport performance.•The 2D:MXene layer demonstrates superior efficacy in obstructing water and safeguarding the underl...

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Veröffentlicht in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2024-11, Vol.500, p.156686, Article 156686
Hauptverfasser: Li, Yaobin, Zou, Yu, Yang, Shuang, Wang, Hantao, Yu, Wenjin, Guo, Haoqing, Li, Xiangdong, Cao, Yunxuan, Liu, Yueli, Tang, Zhenyu, Qu, Bo, Xiao, Lixin, Chen, Zhijian
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Sprache:eng
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Zusammenfassung:•The MXene-modified 2D perovskite capping layer was constructed on the 3D perovskite surface for the first time.•The interaction between MXene and perovskite enhances the carrier transport performance.•The 2D:MXene layer demonstrates superior efficacy in obstructing water and safeguarding the underlying 3D perovskite. Fabrication of 2D perovskite capping layer on the surface of 3D perovskite is proved to be practical strategies to improve the efficiency and stability of perovskite solar cells. However, 2D perovskite usually shows lower mobility and conductivity due to large organic ammonium cations and intrinsic quantum well structure. To address this issue, a strategy of incorporating Ti3C2Tx (MXene) monolayer nanoplates into phenylethylammonium iodide (PEAI) solution (PEAI:MXene composite) to form Ti3C2Tx-modified 2D perovskite PEA2PbI4 (2D:MXene) on 3D perovskite (3D/2D:MXene) by in situ thermal annealing is developed. It is found that the formation of hydrogen bonds N-H⋅⋅⋅F between the −F groups of Ti3C2Tx and PEA+, with passivation of uncoordinated Pb2+ defects by −O groups of Ti3C2Tx, therefore the 2D:MXene layer shows higher mobility, reduced interfacial nonradiative recombination, and facilitated hole extraction. Consequently, n-i-p perovskite solar cells with 3D/2D:MXene heterostructures exhibit champion power conversion efficiency (PCE) of 22.72 % and improved long-term stability, which retain 95.5 % of its initial PCE after 1000 h exposure in ambient air without encapsulation.
ISSN:1385-8947
DOI:10.1016/j.cej.2024.156686