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The synthesis and characterization of two new organic dyes adopting coplanar diphenyl-substituted dithienosilole as the central linkage is described, where they are used as the sensitizers for dye-sensitized solar cells (DSSCs). The best DSSC has displayed a high power conversion efficiency under AM 1.5G irradiation, reaching 96% of the ruthenium dye N719-based reference cell under the same conditions.

An examination is done of anisotropic optical properties of vacuum-deposited thin films of high-efficiency blue-emitting ter(9,9-diarylfluorene)s using variable-angle spectroscopic ellipsometry. It is inferred that the vacuum-deposited ter(9,9-diarylfluorene) molecules tend to align their molecular axes and pi-pi* transition dipole moments along the substrate surface as noticed in spin-coated films of alkyl-substituted polyfluorenes or oligofluorenes, even though the present ter (9,9-diarylfluorene)s have rigid and bulky aryl substituents on C9, relatively shorter oligomer chains, and very different deposition conditions.