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- Title
Einstein relation in chemically doped organic semiconductors.
- Authors
Peng, Y.-Q.; Yang, J.-H.; Lu, F.-P.; Yang, Q.-S.; Xing, H.-W.; Li, X.-S.; Song, C.-A.
- Abstract
Based on the assumption of Gaussian energy distributions of the lowest unoccupied molecular orbital (LUMO) and the highest occupied molecular orbital (HOMO), analytical expressions of generalized Einstein relation in chemically doped organic semiconductor are developed, by approximation of Coulomb traps with a rectangle potential well. Numerical calculations show that traditional Einstein relations do not hold for chemically doped organic semiconductors. Similar to physical doping, the dependence of diffusion coefficient to mobility D/μ ratio on the carrier concentration has a maximum. An essential difference between chemical doping and physical doping is that, the D/μ ratio in chemically doped organic semiconductors depends not only on carrier concentration and doping concentration, but also on the applied electric field.
- Subjects
MOLECULAR orbitals; ZINC oxide; NANOSTRUCTURES; PHOTOCONDUCTIVITY; ORGANIC semiconductors; SEMICONDUCTOR doping
- Publication
Applied Physics A: Materials Science & Processing, 2006, Vol 86, Issue 2, p225
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-006-3747-1