Charge separation and recombination in a photoconducting polymer with electron donor-acceptor complexes

Article Abstract:

Picosecond and femtosecond dynamic studies of photogenerated ion pairs in the photoconducting polymer poly-N-epoxypropylcarbazole (PEPCz) were performed. The experiments were conducted to measure the polarized transient absorption spectra and kinetics of films and solutions of PEPCz. Strong absorption bands estimated at 4.8,4.2 and 3.6 eV were observed. The speedy formation of a carbazolyl cation radical and electron acceptor anion was attributed to the photoexcitation of a weak electron donor-acceptor complex. Moreover, a limited hole transfer was observed after photoexcitation.

Surface chemistry, Electron donor-acceptor complexes, Conducting polymers, Photopolymers

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photosynthetic light-harvesting: reconciling dynamics and structure of purple bacterial LH2 reveals function of photosynthetic unit

Article Abstract:

A study was conducted to analyze the elementary excitation transfer properties of the purple bacterial LH2 peripheral complex. Structures of LH2 from Rs. molischianum and Rps. acidophila were compared against each other. Experimental results indicated that the characteristic structural features of LH2 and LH1 are designed to maximize the overall light-harvesting and trapping procedure in the photosynthetic unit.

Bacteria, Proteins, Photosynthesis research

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Excited state and charge photogeneration dynamics in conjugated polymers

Article Abstract:

The study results of the photophysics and excited state dynamics of conjugated polymers which explain exciton formation, quenching, and generation of charge carriers is presented.

Exciton theory, Excitons

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