Photoconductivity in Organic Molecular Crystals

Excitons in Organic Molecular Crystals

Percolation transition of persistent photoconductivity in II-VI mixed crystals.

We have observed for the first time conductivity fluctuations in the persistent photoconductivity mode in II-VI mixed crystals with the magnitude following the percolation approach as ~ T — T, ~ s, where T, is the percolation threshold temperature. Experimental results have demonstrated that the random local-potential fluctuations induced by compositional fluctuations are responsible for the pe...

Coherent Phonon Wavepackets in Quasi-1D Organic Molecular Crystals

Organic thin films with semiconducting properties have recently attracted large interest due to novel device possibilities like organic LED, lasers, and solar cells. Particularly attractive for applications are molecules which form quasi-1D crystals: Here, the strong orbital overlap between neighboring molecules favors the generation and transport of charge carriers. However, the phonon propert...

First-principles intermolecular binding energies in organic molecular crystals

The intermolecular binding (lattice) energies are calculated for the molecular crystals cyclotrimethylene trinitramine, pentaerythritol, and pentaerythritol tetranitrate using the CRYSTAL 98/03 and GAUSSIAN 98 programs, the DMOL program and the CASTEP program and compared with experiment. Calculating the theoretical intermolecular binding energy as a tool for testing the intrinsic quality of a ...

Dielectric and photoconductivity properties of semiorganic nonlinear optical LMHCl crystals

Department of Physics, Arignar Anna government Arts College, Cheyyar, Tamilnadu, India. a Department of Physics, Thirumalai Engineering College, Kancheepuram, Tamilnadu, India. Department of Physics, Government Arts College for Men, Nandanam, Chennai, India. *Department of Physics, Presidency College, Chennai, Tamilnadu, India. ___________________________________________________________________...