Abstract
Single-crystalline organic semiconductors exhibiting band transport have opened new possibilities for the utilization of efficient charge carrier conduction in organic electronic devices. The epitaxial growth of molecular materials is a promising route for the realization of well-crystallized organic semiconductor p–n junctions for optoelectronic applications enhanced by the improved charge carrier mobility. In this study, the formation of a high-quality crystalline interface upon “quasi-homoepitaxial” growth of bis(trifluoromethyl)dimethylrubrene (fmRub) on the single-crystal surface of rubrene was revealed by using out-of-plane and grazing-incidence X-ray diffraction techniques. Ultraviolet photoelectron spectroscopy results indicated abrupt electronic energy levels and the occurrence of band bending across this quasi-homoepitaxial interface. This study verifies that the minimization of the lattice mismatch enhances the crystalline qualities at the heterojunctions even for van der Waals molecular condensates, potentially opening an untested route for the realization of high-mobility organic semiconductor optoelectronics.
Highlights
Single-crystalline organic semiconductors exhibiting band transport have opened new possibilities for the utilization of efficient charge carrier conduction in organic electronic devices
A number of molecular species have been reported to exhibit mobility exceeding that of amorphous silicon in single-crystalline field-effect transistor devices composed of these materials.[6−8] In the case of optoelectronic devices such as organic photovoltaics, conventional architectures are composed of p-type and n-type materials of disordered condensates,[9,10] and making use of the highly efficient charge carrier transport of single-crystalline structures may offer another possible concept to improve the device performance.[11−15] In this context, epitaxial growth of organic semiconductors is a reasonable approach for obtaining crystalline p−n junctions through self-assembly
The electronic structure at this well-ordered interface was probed by using ultraviolet photoelectron spectroscopy (UPS), and the results indicated the occurrence of band bending presumably due to a small portion of electron transfer from rubrene single crystal (RubSC) to fmRub
Summary
Single-crystalline organic semiconductors exhibiting band transport have opened new possibilities for the utilization of efficient charge carrier conduction in organic electronic devices.
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