银纳米颗粒界面层对有机太阳能电池光敏层相分离的影响

通过原子力显微镜(AFM)和X射线光电子能谱(XP S)表征,研究了在光敏层与阳极缓冲层界面引入银(Ag)纳米颗粒界面层后对PTB7:PC70BM光 敏层相分离的影响,并通过接触角测试对其影响机理进行了分的,结果表明,当引入Ag纳米 颗粒界面层后,光敏层的表面形貌并没有发生 明显的改变,但是光敏层在横向与纵向方向有了更好的相分离；并发现,引入Ag纳米颗粒引 起 的光敏层优化的相分离,本质上源于其底部PEDOT:PSS层表面能的减小,其中起关键作用的 是乙醇溶剂；通过紫外-可见吸收光谱以及相关电池性能测试确认,乙醇溶剂处理PEDOT:P SS表面有助于提高电池的电性能。 本文研究表明,在有机太阳能电池(OSCs)中引入金属纳米颗粒,不仅要考虑其 光学效应,还要考虑由于光敏层相分离的变化引起的电学效应。

Effects of interface layer of silver nanoparticles on phase separation of the ph otosensitive layer in organic solar cells

The effects of interface layer PEDOT:PSS/PTB7:PC₇₀BM of silver nanoparticl es on phase separation of photosensitive laye r PTB7:PC₇₀BM are analyzed by the contact angle measurement,atomic force microscope(AFM) and X-ray photoelectron spectroscopy(XPS) charact eriza tion along with performance parameters of the related solar cell.The results in dicate that introducing silver nanoparticles at the interface of PEDOT:PSS/PTB7: PC ₇₀BM would not change the surface morphology of the photosensitive layer,b ut optimize the phase separation of the photosensitive layer,which is essentiall y attributed to the change of surface energy of PEDOT:PSS,mainly resulting from e thanol solvent.This study shows that for silver nanoparticles integrated organi c solar cells,we not only need to consider the optical effects induced by silver nanoparticles,such as localized plasmonic effect and light scattering,but also need to consider the electrical effects due to the changes of phase separation of the photosensitive layer.