Dynamic character of charge transport parameters in disordered organic semiconductor field-effect transistors.
Summary of "Dynamic character of charge transport parameters in disordered organic semiconductor field-effect transistors."
In this perspective article, we discuss the dynamic instability of charge carrier transport in a range of popular organic semiconductors. We observe that in many cases field-effect mobility, an important parameter used to characterize the performance of organic field-effect transistors (OFETs), strongly depends on the rate of the gate voltage sweep during the measurement. Some molecular systems are so dynamic that their nominal mobility can vary by more than one order of magnitude, depending on how fast the measurements are performed, making an assignment of a single mobility value to devices meaningless. It appears that dispersive transport in OFETs based on disordered semiconductors, those with a high density of localized trap states distributed over a wide energy range, is responsible for the gate voltage sweep rate dependence of nominal mobility. We compare such rate dependence in different materials and across different device architectures, including pristine and trap-dominated single-crystal OFETs, as well as solution-processed polycrystalline thin-film OFETs. The paramount significance given to a single mobility value in the organic electronics community and the practical importance of OFETs for applications thus suggest that such an issue, previously either overlooked or ignored, is in fact a very important point to consider when engaging in fundamental studies of charge carrier mobility in organic semiconductors or designing applied circuits with organic semiconductors.
Affiliation
Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA. podzorov@physics.rutgers.edu.
Journal Details
This article was published in the following journal.
Name: Physical chemistry chemical physics : PCCP
ISSN: 1463-9084
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/22868385
- DOI: http://dx.doi.org/10.1039/c2cp41823a
Medical and Biotech [MESH] Definitions
Ions
An atom or group of atoms that have a positive or negative electric charge due to a gain (negative charge) or loss (positive charge) of one or more electrons. Atoms with a positive charge are known as CATIONS; those with a negative charge are ANIONS.
Organic Anion Transporters, Atp-dependent
A subclass of ORGANIC ANION TRANSPORTERS whose transport of organic anions is linked directly to the hydrolysis of ATP. The subclass includes those ATP-BINDING CASSETTE TRANSPORTERS that transport organic ions.
Organic Anion Transporters, Sodium-dependent
A subclass of ORGANIC ANION TRANSPORTERS whose transport of organic anions is driven either directly or indirectly by a gradient of sodium ions.
Organic Anion Transporters, Sodium-independent
A subclass of ORGANIC ANION TRANSPORTERS that do not rely directly or indirectly upon sodium ion gradients for the transport of organic ions.
Organic Cation Transport Proteins
A family of proteins involved in the transport of organic cations. They play an important role in the elimination of a variety of endogenous substances, xenobiotics, and their metabolites from the body.
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