Field-effect Carrier Doping to Organic Molecular Crystals

Organic field-effect transistors using single crystals.

Organic field-effect transistors using small-molecule organic single crystals are developed to investigate fundamental aspects of organic thin-film transistors that have been widely studied for possible future markets for 'plastic electronics'. In reviewing the physics and chemistry of single-crystal organic field-effect transistors (SC-OFETs), the nature of intrinsic charge dynamics is elucida...

Contactless charge carrier mobility measurement in organic field-effect transistors

With the increasing performance of organic semiconductors, contact resistances become an almost fundamental problem, obstructing the accurate measurement of charge carrier mobilities. Here, a generally applicable method is presented to determine the true charge carrier mobility in an organic field-effect transistor (OFET). The method uses two additional finger-shaped gates that capacitively gen...

Excitons in Organic Molecular Crystals

X-ray Irradiation-induced Carrier Doping in Organic Mott Insulators

X-ray irradiation usually induces disorders in a crystal, for example, displacement of the atomic position. In the case of molecular materials, the irradiation produces the molecular defects, which are radiolysed by ionizing radiation. This kind of molecular defect permanently remains, while the irradiation damage in inorganic materials in general is only due to atomic displacements which can b...

Doping-induced realignment of molecular levels at organic–organic heterojunctions

This article examines how the concept of alignment of charge neutrality levels (CNL) can be used to explain and predict interface dipole and molecular level offset at organic–organic (OO) heterojunctions. The application of the model of CNL alignment to interfaces between undoped materials is reviewed first. The model is then extended to explain the shift of the CNL upon electrical doping of an...