Universal Size-Dependent Conductance Fluctuations in Disordered Organic Semiconductors

A. Massé, R. Coehoorn, P. A. Bobbert
2014 Physical Review Letters  
Numerically exact results of hopping charge transport in disordered organic semiconductors show for uncorrelated and dipole-correlated Gaussian energy disorder a universal, power-law, and non-power-law dependence, respectively, of the relative conductance fluctuations on the size of the considered region. Data collapse occurs upon scaling with a characteristic length having a power-law temperature dependence. Below this length, which can be as high as 100 nm for correlated disorder in a
more » ... sorder in a realistic case, fluctuations dominate and a continuum description of charge transport breaks down.
doi:10.1103/physrevlett.113.116604 pmid:25259995 fatcat:cj4rujxaufetvgp4wzjpk227b4