The interfacial layer (IL) in organic solar cells (OSCs) can be an important boosting factor for improving device efficiency and stability. Herein, a facile and cost‐effective approach to form a uniform molybdenum oxide (MoO₃) film with desirable stability is provided, based on solution processing at low temperatures by simplified precursor solution synthesis. The solution‐processed MoO₃ (SM) film, with oxygen vacancies induced by the hydroxyl group, functions as an efficient anode IL in conventional OSCs. The hole‐transporting performance of SM is well demonstrated in nonfullerene‐based OSCs exhibiting over 10% of power conversion efficiency. The enhanced device performance of SM‐based OSCs over that of poly(3,4‐ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is investigated by analyzing the morphology, electronic state, and electrical conductivity of such a hole‐transporting layer, as well as the charge dynamics in the completed devices. Furthermore, the high stability of the SM films in OSCs is examined under various environmental conditions, including long‐term and thermal stability. In particular, fullerene‐based OSCs with SM maintain over 90% of their initial cell performance over 2500 h under inert conditions. It is shown that solution‐processed metal oxides can be viable ILs with high functionality and versatility, overcoming the drawbacks of conventionally adopted conducting polymer interlayers.

中文翻译：

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固溶处理的氧化钼，具有羟基自由基诱导的氧空位，可作为有机太阳能电池的高效且稳定的界面层

有机太阳能电池（OSC）中的界面层（IL）可能是提高器件效率和稳定性的重要推动因素。在此，基于在低温下通过简化的前体溶液合成而进行的溶液处理，提供了一种简便且经济高效的方法来形成具有所需稳定性的均匀氧化钼（MoO ₃）膜。固溶处理的MoO ₃（SM）膜具有由羟基诱导的氧空位，在常规OSC中可作为有效的阳极IL。SM的空穴传输性能在基于非富勒烯的OSC中得到了充分证明，该OSC的功率转换效率超过10％。通过分析此类孔的形态，电子状态和电导率，研究了基于SM的OSC相对于聚（3,4-乙烯二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）的增强的器件性能。传输层，以及完整器件中的电荷动态。此外，在各种环境条件下（包括长期和热稳定性），都检验了OSC中SM膜的高稳定性。特别是，在惰性条件下，带有SM的基于富勒烯的OSC在2500小时内可保持其初始电池性能的90％以上。