Journal Article10.1103/PHYSREVLETT.96.156803
Evidence for Temperature-Dependent Electron Band Dispersion in Pentacene
TL;DR: Intermolecular electronic coupling in pentacene thin films is confirmed to be dependent on temperature and possibly crystal structure, as suggested by additional infrared absorption measurements.
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Abstract: Evidence for temperature-dependent electron band dispersion in a pentacene thin film polymorph on graphite is provided by angle- and energy-dependent ultraviolet photoelectron spectroscopy. The bands derived from the highest occupied molecular orbital exhibit dispersion of $\ensuremath{\sim}190\text{ }\text{ }\mathrm{meV}$ at room temperature, and $\ensuremath{\sim}240\text{ }\text{ }\mathrm{meV}$ at 120 K. Intermolecular electronic coupling in pentacene thin films is thus confirmed to be dependent on temperature and possibly crystal structure, as suggested by additional infrared absorption measurements.
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Citations
Electronic band structure of pentacene: An experimental and theoretical study
Stephen Berkebile,Peter Puschnig,Georg Koller,Martin Oehzelt,Falko P. Netzer,Claudia Ambrosch-Draxl,Michael G. Ramsey +6 more
TL;DR: In this article, angle resolved photoemission spectroscopy using a uniaxially aligned crystalline thin film was used to measure the intermolecular and intramolecular dispersions of pentacene.
70
Electronic states of CuPc chains on the Au(110) surface
Fabrizio Evangelista,Alessandro Ruocco,Roberto Gotter,Albano Cossaro,Luca Floreano,A. Morgante,F. Crispoldi,M. G. Betti,Carlo Mariani +8 more
TL;DR: The electronic properties of Cu-phthalocyanine molecules flat lying along the channels of the Au(110) reconstructed surface have been investigated by means of ultraviolet and x-ray photoelectron spectroscopy, revealing a bandwidth of about 90 meV along the enlarged Au channels, where the CuPc chains are formed, with a defined fivefold symmetry well fitting theCuPc intermolecular distance.
64
Electron affinity of pentacene thin film studied by radiation-damage free inverse photoemission spectroscopy
TL;DR: The electron affinity of pentacene thin films has been evaluated during the last decades, but it is still under controversial due to varieties of film quality and radiation damages of the films introduced during inverse photoemission spectroscopy (IPES) experiment together with insufficient energy resolution of the instruments.
64
Photogenerated Intrinsic Free Carriers in Small-molecule Organic Semiconductors Visualized by Ultrafast Spectroscopy.
Xiaochuan He,Gangbei Zhu,Jianbing Yang,Hao Chang,Meng Qingyu,Hongwu Zhao,Xin Zhou,Shuai Yue,Zhuan Wang,Jinan Shi,Lin Gu,Donghang Yan,Yuxiang Weng +12 more
TL;DR: O observation of direct delocalized free carrier generation upon interband photoexcitation in highly crystalline zinc phthalocyanine films prepared by the weak epitaxy growth method using ultrafast spectroscopy suggests that delocalization free carriers photogeneration can also be achieved in organic semiconductors when the molecules are packed properly.
On the mechanism of charge transport in pentacene
Hendrik A. van Laarhoven,C. F. J. Flipse,Mattijs Koeberg,Mischa Bonn,Euan Hendry,Giorgio Orlandi,Oana D. Jurchescu,Thomas Palstra,Alessandro Troisi +8 more
TL;DR: Evidence is presented that the strong coupling to low frequency motions is the factor limiting the conductivity in pentacene single crystals, which explains the apparent paradox of the "bandlike" temperature dependence of the Conductivity beyond the validity limit of the band model.
References
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Effect of impurities on the mobility of single crystal pentacene
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The effect of impurities on the mobility of single crystal pentacene
TL;DR: In this paper, a hole mobility for the organic conductor pentacene of 35 cm2/Vs at room temperature increasing to 58 cm2 /Vs at 225k was obtained.