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The synthesis and photophysical characterization of a PPV-type copolymer containing a fluorene derivative alternated with thiophene units is presented: poly(9,9’-dioctylfluorene-thiophene) (LAPPS29). Photophysical studies demonstrated that in the solid state only preformed ground state aggregates are responsible for exciton formation. These aggregates are formed with a wide range of size distribution...
An all solution processed tandem photovoltaic structure, consisting of a hydrazine treated PbSe nanocrystal photoconducting film and a P3HT/PCBM bulk heterojunction solar cell, was fabricated. The PbSe nanocrystal cell was use as the top (light incident from top) cell, and optimized in thickness, to absorb predominantly UV and short wavelength visible light. The lower P3HT/PCBM cell absorbed the remaining...
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