Doping highly ordered organic semiconductors: Experimental results and fits to a self-consistent model of excitonic processes, doping, and transport

Article Abstract:

A study on the n-type doping in a crystalline perylene diimide organic semiconductor (PPEEB) reveals that electrostatic attractions between the dopant electron and its conjugate dopant cation cause the free carrier density to be much lower than the doping density. Report on the measurements of the dark currents as a function of field, doping density, electrode spacing, and temperature are mentioned.

Analysis, Electrostatics, Semiconductor doping

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Emitting excitonic polaron states in core LH1 and peripheral LH2 bacterial light-harvesting complexes

Article Abstract:

The lowest energy excitation states of bacteriochlorophyll alpha-containing light-harvesting (LH) pigment - protein complexes, which determine the utilization of solar energy in photosynthetic bacteria, are discussed. The study was conducted at 5K in core LH1 and peripheral LH2 antenna complexes isolated from the photosynthetic purple bacterium Rhodobacter sphaeroides.

Photosynthesis

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Excitation wavelength-dependent electron-phonon and electron-vibrational coupling in the CP29 antenna complex of green plants

Article Abstract:

A detailed characterization of electron-phonon and electron-vibrational coupling strengths of a weakly coupled chlorophyll transition of the antenna complex CP29 of photosystem II of green plants at 4.5 K is described.

Observations, Chemical properties, Spin coupling, Photosystem II

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