Low-Cost Multilayer MXene Doped Carbon Electrode for High-Performance Hole-Transport-Layer-Free Perovskite Solar Cells

作者：Yating Du, Wei Huang, S. J. Li, Songwei Wang, Huanzhi Zhang, Lixian Sun, Chengwen Huang, Jin-Xiang Chen, Ping Cai · 发表于：ACS Applied Nano Materials · 年份：2025 · DOI：10.1021/acsanm.5c03359 · 被引用次数：7 · 研究领域：Perovskite Materials and Applications、MXene and MAX Phase Materials、Conducting polymers and applications

Hole-transport-layer (HTL)-free carbon-based PSCs (C-PSCs) show attractive commercial potential due to low production costs, simplifying manufacturing process, and relatively high stability. The defect passivation of perovskite and energy-level modification of the carbon electrode are crucial to further improve the PCE and stability of C-PSCs. Herein, a low-cost multilayer Ti 3 C 2 T x MXene is doped into carbon paste to construct MXene@carbon electrode for C-PSCs. The preparation of multilayer MXene is simple and cost-effective due to only requiring the etching of the MAX phase. The incorporation of MXene appropriately increases the work function, providing a suitable energy level alignment between perovskite and MXene@carbon. The surface T x groups of MXene can form favorable interaction with the oxygen-containing functional groups of graphite, facilitating the good dispersion of MXene in the carbon paste, which improve the interface contact between perovskite and MXene@carbon and the conductivity and morphology of MXene@carbon electrode. Therefore, the MXene@carbon C-PSCs show enhanced charge transport and extraction and reduced defects and charge recombination and thus achieve significantly improved photovoltaic performance and operational stability. Compared with the conrtol MAPbI 3 device with pristine carbon electrode (PCE of 12.69%), the MXene@carbon device exhibits obviously higher PCE of 16.00%, which is top-level for HTL-free MAPbI 3 C-PSCs without perovskite passi...