4.6 Article

Exciton diffusion in energetically disordered organic materials

Journal

PHYSICAL REVIEW B
Volume 80, Issue 19, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.195209

Keywords

diffusion; excitons; Monte Carlo methods

Funding

  1. European Commission STREP [NMP-CT2006- 016434]
  2. Belgian Science Policy [P6/27]
  3. Belgian Research Science Foundation (FNRS and FRFC through the Interuniversity Scientific Calculation Facility, ISCF)

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We implement a simple, continuous, analytical model for exciton hopping in an energetically disordered molecular landscape. The model is parameterized against atomistic and lattice Monte Carlo simulations based on quantum-chemical calculations. It captures the essential physics of exciton diffusion in disordered media at different temperatures and yields a universal scaling law of the diffusion length with the dimensionless disorder parameter given by the ratio of the energetic disorder width to the thermal energy.

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