Highly Sensitive Evaluation of Density of States in Molecular Semiconductors by Photoelectron Yield Spectroscopy in Air.

ACS Applied Materials & Interfaces
Kyohei NakanoKeisuke Tajima

Abstract

Despite the critical importance of the density of states (DOS) to the electrical properties of molecular semiconductors, there are few reliable measurement methods for the DOS, especially for the edge regions with low DOS that determine the charge conduction. Here, we evaluate the DOS for occupied states with high sensitivity (down to 10-5 relative to the peak maxima) using a commercially available photoelectron yield spectroscopy (PYS) system operated in air. The conduction edges of the DOS for both the semiconducting polymers and molecules are expressed as a single Gaussian with no gap states with one exception. There are subtle differences in the widths of the Gaussian for the DOS edges between the surface of the polymer films and the interface with the substrate, which result in the large difference in the lateral charge carrier mobilities at each interface. The charge carrier mobilities of the semiconducting polymers have a correlation with the widths of the DOS. PYS in air is a powerful tool for studying the relationship among the structure and electronic and electrical properties of molecular semiconductors.

References

Jun 20, 1988·Physical Review Letters·K WinerL Ley
Aug 15, 2002·Journal of the American Chemical Society·Dmitry KolosovChihaya Adachi
Mar 21, 2006·Nature Materials·Iain McCullochMichael F Toney
Apr 2, 2010·ACS Applied Materials & Interfaces·Qingshuo WeiKazuhito Hashimoto
Aug 4, 2010·Journal of the American Chemical Society·Weimin ZhangIain McCulloch
Nov 11, 2014·Nature·Deepak VenkateshvaranHenning Sirringhaus
Apr 11, 2015·Nature Communications·Hiroaki IinoJun-ichi Hanna
Oct 11, 2016·Chemical Reviews·Oksana Ostroverkhova
Dec 20, 2017·Nature Materials·Hyun Ho ChoiVitaly Podzorov
Jan 23, 2020·Advanced Materials·Guillaume SchweicherYves H Geerts
Sep 5, 2020·Advanced Materials·Fengyu ZhangAntoine Kahn

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.

Related Papers

The Journal of the American Osteopathic Association
H M Rosner
Archivum Immunologiae Et Therapiae Experimentalis
A M WaagaW Müller-Ruchholtz
© 2021 Meta ULC. All rights reserved