UNSPECIFIED (2006) Dynamics of the intermolecular transfer integral in crystalline organic semiconductors. JOURNAL OF PHYSICAL CHEMISTRY A, 110 (11). pp. 4065-4070. doi:10.1021/jp055432g ISSN 1089-5639.

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Abstract

In organic crystalline semiconductor molecular components are held together by very weak interactions and the transfer integrals between neighboring molecular orbitals are extremely sensitive to small nuclear displacements. We used a mixed quantum chemical and molecular dynamic methodology to assess the effect of nuclear dynamics on the modulation of the transfer integrals between close molecules. We have found that the fluctuations of the transfer integrals are of the same order of magnitude of their average value for pentacene and anthracene. Under these conditions the usual perturbative treatment of the electron-phonon coupling is invalid, the band description of the crystal breaks down and the charge carriers become localized. Organic crystals of pentacene and anthracene, even in the absence of defects, can be regarded as disordered media with respect to their charge transport properties. These results suggest that the dynamic electronic disorder can be the factor limiting the charge mobility in crystalline organic semiconductors.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Journal or Publication Title:	JOURNAL OF PHYSICAL CHEMISTRY A
Publisher:	AMER CHEMICAL SOC
ISSN:	1089-5639
Official Date:	23 March 2006
Dates:	Date Event 23 March 2006 UNSPECIFIED
Volume:	110
Number:	11
Number of Pages:	6
Page Range:	pp. 4065-4070
DOI:	10.1021/jp055432g
Publication Status:	Published

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