基于AgAl合金表面等离子体增强效应在高效稳定聚合物太阳能电池的应用研究

发布时间：2018-08-01 13:28

【摘要】：目前,硅基电池占据太阳能电池市场主要地位。但其价格高、缺乏柔性和透明等缺点,限制了其应用领域。有机太阳能电池作为新型太阳能电池的一种,具有价格低廉、质地轻、柔性等特点,并且效率已突破11%,具有商业应用前景。但由于有机半导体材料存在激子扩散距离短,载流子迁移率低,限制了有机活性层厚度,导致无法充分吸收太阳光,限制了有机太阳能电池光电转换效率(PCE)的提高。贵金属表面等离子体共振(LSPR)效应已被证实是提高有机半导体薄膜光吸收率的一种行之有效的办法,但缺乏提升电池效率和稳定性的有效策略。本论文基于AgAl合金和金表面等离子体共振效应,并结合界面修饰技术,对提升电池的光电转换效率和稳定性进行了较深入研究。具体内容如下:(1)通过热蒸镀法在MoO_3中插入AgAl和Ag纳米结构,通过调节MoO_3隔离层厚度和蒸镀Ag和AgAl名义厚度优化AgAl和Ag纳米结构和尺寸,以便有效调节其等离子体效应和提升聚合物太阳能电池性能。研究表明:空穴传输层结构为Mo0_3(8 nm)/AgAl(3nm)/MoO_3(1 nm)的太阳能电池获得9.79%效率,明显高于Ag结构的参比电池效率8.55%。采用1 nm厚MoO_3隔离层,能有效控制Ag纳米结构的表面等离子体共振效应。采用AgAl合金纳米结构的电池,经120天老化实验后效率仍保留原来的60%,而采用Ag纳米结构电池效率经120天衰减到原来的26%,因此,AgAl结构的电池稳定性有明显提升。(2)通过热蒸镀法在MoO_3/AgAl/MoO_3结构里进一步掺入Au纳米结构,通过优化MoO_3隔离层厚度,实现了 Ag和Au纳米结构的表面等离子体共振的协同效应,扩展了光活性层的光吸收效果。将ZnO电子传输层替换为AZO,采用空穴传输层结构为MoO_3(8 nm)/AgAl(3 nm)/Au(1 nm)/MoO_3(2 nm)的电池光吸收进一步增强,电池效率可达到10.30%。
[Abstract]:At present, silicon-based cells occupy a major position in the solar cell market. However, its high price, lack of flexibility and transparency and other shortcomings limit its application field. As a new type of solar cells, organic solar cells have the characteristics of low price, light quality, flexibility, etc. However, due to the short distance of exciton diffusion and low carrier mobility in organic semiconductor materials, the thickness of the organic active layer is limited, which leads to the inability to fully absorb solar light and limits the improvement of photovoltaic conversion efficiency (PCE) of organic solar cells. The surface plasmon resonance (LSPR) effect of noble metals has been proved to be an effective method to improve the photoabsorption of organic semiconductor films, but it lacks an effective strategy to improve the efficiency and stability of the cells. Based on the AgAl alloy and gold surface plasmon resonance (SPR) effect and the interfacial modification technique, the photovoltaic conversion efficiency and stability of the battery were studied in this paper. The main contents are as follows: (1) AgAl and Ag nanostructures were inserted into MoO_3 by thermal evaporation, and the nanostructures and sizes of AgAl and Ag were optimized by adjusting the thickness of MoO_3 isolation layer and the nominal thickness of MoO_3 and Ag and AgAl. In order to effectively adjust its plasma effect and improve the performance of polymer solar cells. The results show that Mo0_3 (8 nm) / AgAl (3nm) / Moo _ 3 (1 nm) solar cells have 9.79% efficiency, which is significantly higher than that of Ag reference cells (8.55%). The surface plasmon resonance (SPR) effect of Ag nanostructures can be effectively controlled by 1 nm thick MoO_3 insulator. The battery with AgAl alloy nanostructure, After 120 days of aging experiment, the efficiency of Ag nanostructure battery was reduced to 26% after 120 days of aging experiment. Therefore, the stability of Ag-Al structure was improved obviously. (2) the stability of MoO_3/AgAl/MoO_3 structure was further improved by thermal evaporation method. Doped with au nanostructures, By optimizing the thickness of MoO_3 isolation layer, the synergistic effect of surface plasmon resonance of Ag and au nanostructures was realized, and the photoabsorption effect of the photoactive layer was expanded. The ZnO electron transport layer was replaced by AZO, and the photoabsorption of MoO_3 (8 nm) / AgAl (3 nm) / au (1 nm) / Moo 3 (2 nm) was further enhanced, and the cell efficiency was 10.30 nm.
【学位授予单位】：华东师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM914.4

【参考文献】