溶剂挥发时间对体异质结有机太阳能电池复合特性的影响

制备了基于P3HT:PCBM复合体异质结有机太阳能电池,通过改变旋涂速度和时间来控制活性混合膜中溶剂的挥发时间,研究了载流子复合损耗与器件加工制造条件以及界面陷阱密度的关系。测试结果表明,活性复合膜溶剂的挥发时间对有机太阳能电池的光电性能有直接影响。溶剂挥发快的器件产生的陷阱辅助复合最为强烈,基于开路电压与光强对数关系的直线的斜率较大,存在的界面陷阱密度也最大。文中建立了制造加工条件、复合损耗机制、界面陷阱密度、器件光电特性之间的数值联系,这对最终提高聚合物太阳能电池性能具有重要的指导意义。

Solvent Evaporation Time Dependent Recombination Properties in Bulk Heterojunction Organic Solar Cells

The bulk heterojunction organic solar cells based on compositional blend of P3HT and PCBM were fabricated, the relationships among the carrier recombination loss, device manufacturing conditions and interface trap density were studied by changing the spin velocity and spin coating time to control the solvent evaporation time in the mixed film. The results show that the evaporation time of active composite film directly influences the photoelectric performance of organic solar cell. The device that the solvent evaporates faster can produce stronger trap-assisted recombination, it's interface trap density is larger, and the slope of the open circuit voltage versus the logarithm of the light intensity is greater. A numerical relationship among the manufacturing processing conditions, recombination loss mechanism, interface trap density and the device optoelectronic characteristics has been established in this paper, which can offer good guidance to improve the performance of polymer solar cells.