Sun Lulu, Zeng Wenwu, Xie Cong, Hu Lin, Dong Xinyun, Qin Fei, Wang Wen, Liu Tiefeng, Jiang Xueshi, Jiang Youyu, Zhou Yinhua
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China.
Adv Mater. 2020 Apr;32(14):e1907840. doi: 10.1002/adma.201907840. Epub 2020 Feb 24.
All-solution-processed organic solar cells (from the bottom substrate to the top electrode) are highly desirable for low-cost and ubiquitous applications. However, it is still challenging to fabricate efficient all-solution-processed organic solar cells with a high-performance nonfullerene (NF) active layer. Issues of charge extraction and wetting are persistent at the interface between the nonfullerene active layer and the printable top electrode (PEDOT:PSS). In this work, efficient all-solution-processed NF organic solar cells (from the bottom substrate to the top electrode) are reported via the adoption of a layer of hydrogen molybdenum bronze (H MoO ) between the active layer and the PEDOT:PSS. The dual functions of H MoO include: 1) its deep Fermi level of -5.44 eV can effectively extract holes from the active layer; and 2) the wetting issues of the PEDOT:PSS on the hydrophobic surface of the NF active layer can be solved. Importantly, fine control of the H MoO composition during the synthesis is critical in obtaining processing orthogonality between H MoO and the PEDOT:PSS. Flexible all-solution-processed NF organic solar cells with power conversion efficiencies of 11.9% and 10.3% are obtained for solar cells with an area of 0.04 and 1 cm , respectively.
全溶液处理的有机太阳能电池（从底部基板到顶部电极）对于低成本和广泛应用来说是非常理想的。然而，制造具有高性能非富勒烯（NF）活性层的高效全溶液处理有机太阳能电池仍然具有挑战性。在非富勒烯活性层与可印刷顶部电极（PEDOT:PSS）之间的界面处，电荷提取和润湿性问题一直存在。在这项工作中，通过在活性层和PEDOT:PSS之间采用一层氢钼青铜（H₂MoO₃），报道了高效的全溶液处理NF有机太阳能电池（从底部基板到顶部电极）。H₂MoO₃的双重功能包括：1）其-5.44 eV的深费米能级可以有效地从活性层中提取空穴；2）可以解决PEDOT:PSS在NF活性层疏水表面上的润湿性问题。重要的是，在合成过程中对H₂MoO₃组成的精细控制对于获得H₂MoO₃与PEDOT:PSS之间的加工正交性至关重要。对于面积分别为0.04和1 cm²的太阳能电池，获得了功率转换效率分别为11.9%和10.3%的柔性全溶液处理NF有机太阳能电池。
