Khatiwada Devendra, Venkatesan Swaminathan, Ngo Evan C, Qiao Qiquan
J Nanosci Nanotechnol. 2015 Sep;15(9):7040-4. doi: 10.1166/jnn.2015.10513.
In this work role of solvent additive namely 1,8 diiodoctane (DIO) on the nanoscale morphology and its relation with the charge transport of poly(diketopyrrolopyrrole-terthiophene) (PDPP3T):PCBM solar cells has been investigated. Addition of DIO led to enhanced structural ordering as observed from optical measurements. Photovoltaic devices processed with DIO additive showed improved efficiencies due to significant enhancement in short circuit current density. Atomic force microscopy (AFM) and Kelvin probe force microscopy (KPFM) images showed that DIO led to finer phase segregation that gave rise to better photovoltaic performance in additive processed active layers. Photoinduced current extraction by linearly increasing voltage (P-CELIV) measurements on PDPP3T:PCBM solar cells revealed higher mobility and extracted charge carrier density for DIO processed devices.
在这项工作中，研究了溶剂添加剂1,8 - 二碘辛烷（DIO）在纳米尺度形态上的作用及其与聚（二酮吡咯并吡咯 - 对噻吩）（PDPP3T）:PCBM太阳能电池电荷传输的关系。从光学测量中观察到，添加DIO导致结构有序性增强。用DIO添加剂处理的光电器件由于短路电流密度显著提高而表现出更高的效率。原子力显微镜（AFM）和开尔文探针力显微镜（KPFM）图像表明，DIO导致更精细的相分离，从而在添加剂处理的活性层中产生更好的光伏性能。对PDPP3T:PCBM太阳能电池进行的线性增加电压光生电流提取（P - CELIV）测量显示，DIO处理的器件具有更高的迁移率和提取的电荷载流子密度。
