Nanostructure and Optoelectronic Characterization of Small Molecule Bulk Heterojunction Solar Cells by Photoconductive Atomic Force Microscopy

被引:95
作者
Dang, Xuan-Dung [1 ,2 ]
Tamayo, Arnold B. [1 ,2 ]
Seo, Junghwa [1 ,2 ]
Hoven, Corey V. [1 ,2 ]
Walker, Bright [1 ,2 ]
Nguyen, Thuc-Quyen [1 ,2 ]
机构
[1] Univ Calif Santa Barbara, Dept Chem, Dept Mat, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA
[2] Univ Calif Santa Barbara, Dept Biochem, Dept Mat, Inst Polymers & Organ Solids, Santa Barbara, CA 93106 USA
关键词
OPEN-CIRCUIT VOLTAGE; POLYMER; MORPHOLOGY; NANOSCALE; BLENDS; PHOTOCURRENTS; NETWORK; ENERGY;
D O I
10.1002/adfm.201000799
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Photoconductive atomic force microscopy is employed to study the nanoscale morphology and optoelectronic properties of bulk heterojunction solar cells based on small molecules containing a benzofuran substituted diketopyrrolopyrrole (DPP) core (3,6-bis(5-(benzofuran-2-yl)thiophen-2-yl)-2,5-bis(2-ethylhexyl)pyrrolo[3,4-c]pyrrole-1,4-dione, DPP(TBFu)(2), and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM), which were recently reported to have power conversion efficiencies of 4.4%. Electron and hole collection networks are visualized for blends with different donor:acceptor ratios. Formation of nanostructures in the blends leads to a higher interfacial area for charge dissociation, while maintaining bicontinuous collection networks; conditions that lead to the high efficiency observed in the devices. An excellent agreement between nanoscale and bulk open-circuit voltage measurements is achieved by surface modification of the indium tin oxide (ITO) substrate by using aminopropyltrimethoxysilane. The local open-circuit voltage is linearly dependent on the cathode work function. These results demonstrate that photoconductive atomic force microscopy coupled with surface modification of ITO substrate can be used to study nanoscale optoelectronic phenomena of organic solar cells.
引用
收藏
页码:3314 / 3321
页数:8
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