Sino-European School of Technology, Shanghai University, Shanghai, 200444, P. R. China.
School of Mechatronic Engineering and Automation, Shanghai University, Shanghai, 200444, P. R. China.
Small. 2023 Jun;19(23):e2207505. doi: 10.1002/smll.202207505. Epub 2023 Mar 8.
Niobium-carbide (Nb C) 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)-Nb C hybrid hole transport layer (HTL) is developed to enhance the device performance of organic solar cells (OSCs). By optimizing the doping ratio of Nb C 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 Nb C 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 Nb C MXene in the development of high-performance OSCs.
碳化铌（NbC）MXene 作为一种新型二维材料，由于其优异的导电性、大的比表面积和高透光率，在光电器件中有很大的应用潜力。在这项工作中，开发了一种新型的溶液可加工的聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）-NbC 混合空穴传输层（HTL），以提高有机太阳能电池（OSC）的器件性能。通过优化 NbC MXene 在 PEDOT：PSS 中的掺杂比，基于 PM6：BTP-eC9：L8-BO 的三元活性层的 OSC 可以实现最佳的功率转换效率（PCE）为 19.33%，这是迄今为止使用二维材料的单结 OSC 中最高的值。研究发现，NbC MXene 的加入可以促进 PEDOT 和 PSS 段的相分离，从而提高 PEDOT：PSS 的电导率和功函数。显著增强的器件性能归因于混合 HTL 产生的更高的空穴迁移率和电荷提取能力，以及更低的界面复合概率。此外，还证明了混合 HTL 提高基于不同非富勒烯受体的 OSC 性能的通用性。这些结果表明了 NbC MXene 在开发高性能 OSC 中的应用潜力。
