The physics of organic semiconductors

Before a proper evaluation of the matrix elements was available and before the new experimental results on ultrapure pentacene and rubrene were realized, Kenkre et al. [130] were able to fit the classical results of Karl [131] on the temperature dependence of the anisotropic mobility of pentacene with a three dimensional Holstein model. It now seems clear that the fitted parameters are not compatible with the computations (the hopping integral is about two orders of magnitude smaller than the typical value) and that the Holstein Hamiltonian is insufficient to capture the physics of organic semiconductors. 

The study of organic semiconductors and conductors is highly iaterdisciplinary, involving the fields of chemistry, soHd-state physics, engineering, and biology. This article provides a treatment of the theoretical aspects of organic semiconductors as well as an overview of recent advances ia the field and the uses of these materials based on their conductive and optical properties. 

The photosensitivity shown by organometallic compounds permitted their use in electrophotography and optoelectronics [283, 284]. Such materials may also be the bridge connecting the physics of organic and inorganic semiconductors. 

Chapter 2 provides a summary of the chemical physics of organic semiconductor operation. It explains why carbon is so special and how its unique properties lend it to the formation of an unusual class of semiconductor materials. 

This chapter presents a simple introduction to the chemical physics of organic semiconductors, which is a rich and complicated topic. The hope is to develop some intuition which links chemical structure to optical properties and electronic behavior. A much more through discussion is presented is a number of chemical physics-oriented texts including [7] and [8]. 

Physical Properties Electrical. Electrical properties have been the main focus of study of organic semiconductors, and conductivity studies on organic materials have led to the development of materials with extremely low resistivities and large anisotropies. A discussion of conductivity behaviors for various classes of compounds follows. 

Carefully controlled studies of the growth of physically evaporated organic semiconductors on surfaces have shown that near monolayers may be deposited. 

Kokorin, Alexander I, was bom in 1947. Was graduated as a biophysicist in 1970 Ph.D. (Candidate of Sciences) in 1974 D.Sc. degree (Doctor of Sciences) in physical chemistry - in 1992. At present Principal Researcher and Deputy Head of the Division of Kinetics and Catalysis, N. Semenov Institute of Chemical Physics of Russian Academy of Sciences, Moscow, Russia. Area of research interests chemical methods of solar energy conversion chemical physics of organized molecular systems, including nanosized oxide semiconductors doped with transition metal ions, and polymer-metal complexes the study of their structure, absorptive, catalytic, photocatalytic and photoelectrochemical properties. EPR spectroscopy and spin-spin interaction between paramagnetics. He is the author and co-author of more than 170 publications, including two books and several reviews and book chapters. 

One of the motivations of the Raman study is the need to complement the findings on the IR activation of the symmetric modes of acceptors or donors in organic conductors. For instance, Bandrauk et al. [76] have found that the intensities of the Raman spectra of organic semiconductor K-TCNQ correlate fairly well with the dimerization phase transitions proposed for the salt. They have suggested that librations are important in describing the physical properties of the systems. 

Recent developments in OLEDs have established a new category of organic semiconductors. Thus, we are now faced with the chance of establishing new organic semiconductor physics and to create new organic semiconductors. 

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