Niobium-carbide (Nb₂C) MXene as a new 2D material has shown great potential for application in photovoltaics due to its excellent electrical conductivity, large surface area, and superior transmittance. In this work, a novel solution-processable poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS)-Nb₂C hybrid hole transport layer (HTL) is developed to enhance the device performance of organic solar cells (OSCs). By optimizing the doping ratio of Nb₂C MXene in PEDOT:PSS, the best power convention efficiency (PCE) of 19.33% can be achieved for OSCs based on the ternary active layer of PM6:BTP-eC9:L8-BO, which is so far the highest value among those of single junction OSCs using 2D materials. It is found that the addition of Nb₂C MXene can facilitate the phase separation of the PEDOT and PSS segments, thus improving the conductivity and work function of PEDOT:PSS. The significantly enhanced device performance can be attributed to the higher hole mobility and charge extraction capability, as well as lower interface recombination probabilities generated by the hybrid HTL. Additionally, the versatility of the hybrid HTL to improve the performance of OSCs based on different nonfullerene acceptors is demonstrated. These results indicate the promising potential of Nb₂C MXene in the development of high-performance OSCs.

中文翻译：

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碳化铌 MXene 改性混合空穴传输层可实现超过 19% 的高性能有机太阳能电池

碳化铌 (Nb ₂ C) MXene 作为一种新型二维材料，由于其优异的导电性、大表面积和优异的透光率，在光伏领域显示出巨大的应用潜力。在这项工作中，开发了一种新型可溶液加工的聚（3,4-乙烯二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT:PSS）-Nb ₂ C 杂化空穴传输层（HTL），以提高有机太阳能电池的器件性能（ OSC）。_{通过优化 Nb 2} C MXene 在 PEDOT:PSS 中的掺杂比，基于 PM6:BTP-eC9:L8-BO 三元活性层的 OSC 可以获得 19.33% 的最佳功率转换效率 (PCE)，即迄今为止，这是使用二维材料的单结 OSC 中的最高值。发现加入 Nb ₂C MXene 可以促进 PEDOT 和 PSS 链段的相分离，从而提高 PEDOT:PSS 的电导率和功函数。显着增强的器件性能可归因于更高的空穴迁移率和电荷提取能力，以及混合 HTL 产生的较低界面复合概率。此外，还证明了混合 HTL 在提高基于不同非富勒烯受体的 OSC 性能方面的多功能性。_{这些结果表明 Nb 2} C MXene 在开发高性能 OSC 方面具有广阔的潜力。