Multiple quantum well structures consisting of alternating layers of two crystalline organic semiconductors, namely, 3,4,9,10 perylenetetracarboxylic dianhydride (PTCDA) and 3,4,7,8 naphthalenetetracarboxylic dianhydride (NTCDA), have been grown by organic molecular beam deposition. The individual layer thicknesses in the multilayer samples were varied from 10 to 200 Å. X‐ray diffraction and birefringence data show that there is a strong structural ordering in all layers, as well as across large spatial distances along the sample surface. Thus, the growth is ‘‘quasi‐epitaxial’’ even though the PTCDA and NTCDA crystal structures are incommensurate. From the optical absorption spectra, it was found that the lowest energy PTCDA singlet exciton line shifts to higher energy with decreasing layer thickness. Comparison of these results with a quantum mechanical model based on exciton confinement in the PTCDA layers is proposed to describe the energy shift.
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12 February 1990
Research Article|
February 12 1990
Quasi‐epitaxial growth of organic multiple quantum well structures by organic molecular beam deposition
F. F. So;
F. F. So
Departments of Electrical Engineering and Materials Science, Center for Photonic Technology, University of Southern California, Los Angeles, California 90089‐0241
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S. R. Forrest;
S. R. Forrest
Departments of Electrical Engineering and Materials Science, Center for Photonic Technology, University of Southern California, Los Angeles, California 90089‐0241
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Y. Q. Shi;
Y. Q. Shi
Departments of Electrical Engineering and Materials Science, Center for Photonic Technology, University of Southern California, Los Angeles, California 90089‐0241
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W. H. Steier
W. H. Steier
Departments of Electrical Engineering and Materials Science, Center for Photonic Technology, University of Southern California, Los Angeles, California 90089‐0241
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Appl. Phys. Lett. 56, 674–676 (1990)
Article history
Received:
August 21 1989
Accepted:
December 04 1989
Citation
F. F. So, S. R. Forrest, Y. Q. Shi, W. H. Steier; Quasi‐epitaxial growth of organic multiple quantum well structures by organic molecular beam deposition. Appl. Phys. Lett. 12 February 1990; 56 (7): 674–676. https://doi.org/10.1063/1.102733
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