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Electroabsorption due to excitons in crystalline molecular thin films grown by organic molecular beam deposition

✍ Scribed by Z. Shen; P.E. Burrows; S.R. Forrest; M. Ziari; W.H. Steier

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
554 KB
Volume
236
Category
Article
ISSN
0009-2614

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✦ Synopsis

We measure the electroabsorption due to the lowest absorption peak in ordered organic molecular crystalline films of 3,4,9,10-perylenetetracarboxylic dianhydride grown by organ;c molecular beam deposition. The application of electric fields induces both a Stark shift and a broadening of the exciton absorption line. We find a nearly spherical exciton of radius 14 + 2 ~,, an effective hole mass of (0.13 + 0.02)too, where mo is the free electron mass, and a binding energy of -150 :t: 15 meV, suggesting that excitons in organic crystals with very small intermolecular stacking distances can be described by a combined Wannier and charge-transfer model.

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