Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8034108 | Thin Solid Films | 2015 | 6 Pages |
Abstract
Control of molecular orientation of organic semiconductor is essential for efficient light absorption and charge-carrier transport in organic optoelectronic devices. We synthesized compound 1 as a fundamental electron-accepting building block for the design of n-type semiconductors and conducting polymers. We found that this molecule, upon evaporation onto a substrate such as SiO2 and electron-donor films, spontaneously assembles with a face-on orientation relative to the substrate surface. This orientation is favorable for thin-film organic photovoltaics. Despite relatively small Ï-conjugation, 1 showed strong absorption in visible-light region and an appropriate lowest unoccupied molecular orbital energy for electron transfer with electron donors including copper phthalocyanine and poly(3-hexylthiophene). Accordingly, thin-film devices, fabricated using 1 and electron donors, exhibited a clear photovoltaic response. This suggests that compound 1 provides a promising building block for the development of active materials in organic photovoltaics.
Related Topics
Physical Sciences and Engineering
Materials Science
Nanotechnology
Authors
Kouki Akaike, Shinji Ando, Hideo Enozawa, Atsuko Kosaka, Takashi Kajitani, Takanori Fukushima,