摘要
围绕着开发可溶液法加工非聚(3,4-乙烯二氧噻吩单体):聚苯乙烯磺酸钠(poly(3,4-ethylendioxythiophene):poly(sodium-p-styrenesulfonate),PEDOT:PSS)电极界面修饰材料的核心目的,研究了基于磷钼酸(phosphomolybdic acid,PMA)和纳米氧化钼(Mo O3)复合物的新型空穴传输材料.通过将PMA溶液和Mo O3纳米粒子溶液进行混合,制备了复合墨水(PMA:Mo O3).该复合墨水在有机活性层表面具有很好的浸润性和成膜性.利用PMA:Mo O3复合空穴传输层(hole transport layer,HTL)制备的倒置P3HT:PC61BM光伏器件的开路电压和填充因子(fill factor,FF)均比基于单一PMA或Mo O3制备的器件有所提升.进一步优化了PMA:Mo O3复合墨水中两个组分间的比例,发现当复合墨水中Mo O3的含量为66%时,器件性能达到最优,其光电转换效率(power conversion efficiency,PCE)为3.71%.成功验证了利用金属氧化物与多金属氧簇(polyoxometalate,POM)复合物作为电极界面缓冲层制备有机太阳能电池的可行性,为开发新型电极界面修饰材料提供了一个新的研究思路.
To develop PEDOT:PSS(poly(3,4-ethylendioxythiophene):poly(sodium-pstyrenesulfonate)—hole transporting materials in polymer solar cells, a solution-processable nanocomposite ink based on MoO_3 nano-particles and phosphomolybdic acid(PMA) is reported. The PMA:MoO_3 composite ink can be easily prepared by simply mixing PMA and MoO_3 solutions in different weight ratios. This PMA:MoO_3 composite ink shows good wettability on polymer surface. A smooth and homogeneous thin film can be easily deposited on polymer surface via a spin-coating process without any surface treatment.Both open circuit voltage(VOC) and fill factor(FF) of the PMA:MoO_3-based P3 HT:PC61 BM cells are higher than that based on PMA or MoO_3 cells. Influence of the blend ratio between PMA and MoO_3 on solar cell performance was carried out, and the optimized best blend ratio was found to be 1∶2 for PMA:MoO_3, with which a highest device performance of 3.71% was achieved. The current work demonstrates that nanocomposite of metal oxide and polyoxometalate(POM) can serve as an excellent electrode buffer layer for solutionprocessed organic electronics.
引文
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