A Bipolar Charge Transport Molecule

Abstract

Hole and electron mobilities have been measured in vapor deposited layers of N-(p-(di-p-tolylamino)phenyl)- N′-(1,2-dimethylpropyl)-1,4,5,8-naphthalenetetracarboxylic diimide (TAND). The TAND molecule contains a naphthalene diimide acceptor functionality and a triarylamine donor functionality. The mobilities are of comparable magnitude and show similar field and temperature dependencies. The results are described within the framework of a formalism based on disorder. The formalism is premised on the assumption that charge transport occurs by hopping through a manifold of localized states with superimposed energetic disorder. The key parameter of the formalism is the energy width of the hopping site manifold. For TAND, the widths are 0.110 and 0.091 eV for hole and electron transport, respectively. The result leads to the conclusion that the hole and electron transport manifolds are independent and not influenced by the transport states of the oppositely charged carriers.

Naphthalene bisimides asymmetrically and symmetrically N-substituted with triarylamine – comparison of spectroscopic, electrochemical, electronic and self-assembly properties

“…Careful literature search revealed that ambipolar character was already reported for a very similar asymmetric naphthalene bisimide-triarylamine derivative. 46 However, in this paper only charge carriers mobilities were measured by time-of-flight technique for vapor deposited layers.…”

Electron-assisted deposition and interface control of naphthalenediimide derivative thin films

“…This paper investigates the preparation of polymer thin films of a naphthaldiimide derivative that was newly synthesized. Naphthalimide [8][9][10] and peryleneimide derivatives [11][12][13] became of interest in recent years owing to their potential for electron-transporting organic semiconductors. However, their poor solubility to organic solvents makes it difficult to incorporate them into polymer thin films.…”

Hole and Electron Transport in Triarylamine-Based Charge-Transport Materials Investigated by the Time-of-Flight Method

“…The mobility of holes versus electrons in amorphous organic electronic materials is a long-standing issue in the field of organic electronics . Experimental results indicate that some of these materials , have similar hole and electron mobility, whereas for others, − these values have been shown to differ by up to orders of magnitude. Several organic molecules have been examined on a theoretical basis, and predictions of relative hole versus electron mobility have been made. ,, Some of these molecules are predicted to have similar hole and electron mobility, while others are predicted to have those that differ greatly.…”