Transistor Application of Phenacene Molecules and Their Characteristics

Abstract

The characteristics of field‐effect transistors (FETs) fabricated from thin films and single crystals of phenacene molecules are fully reported in this review together with the electronic and crystal structures of phenacenes. Phenacene molecules possess a low HOMO level and a wide band gap. The highest mobility observed in the phenacene thin‐film FETs is 7.4 cm2 V–1 s–1 for [6]phenacene, and in single‐crystal FETs the highest value is 6.3 cm2 V–1 s–1 for [7]phenacene. The phenacene thin‐film FETs show O2‐sensing properties unlike their single‐crystal FETs. The bias‐stress effect is fully investigated for phenacene single‐crystal FETs. Furthermore, the low‐voltage operation of phenacene single‐crystal FETs with electric‐double‐layer (EDL) capacitors is reported. The temperature dependence of phenacene single‐crystal FETs is reported to clarify the transport mechanism, which is suggestive of band‐like transport.

Transistor Properties of 2,7-Dialkyl-Substituted Phenanthro[2,1-b:7,8-b′]dithiophene

“…3(b)). This shows a strong similarity to phenacene molecules45926. The out-of-plane XRD pattern of a thin film of 3 formed on a ZrO 2 gate dielectric is shown in Fig.…”

“…3(a); only 00 l reflections were recorded to provide the plane spacing, d 001 , which means the ab -layers are stacked in parallel on the SiO 2 gate dielectric. If the crystal structure of 3 is similar to phenacene’s78925, the channel transports should be formed along the ab -plane. Therefore, the observation of 00 l reflections is suitable for an FET device.…”

“…Field-effect transistors (FETs) using thin films and single crystals of phenacene-type molecules (extended W-patterned structures of fused benzene rings) have been extensively studied using various gate dielectrics123456789101112131415161718. The highest field-effect mobility ( μ ) reported in these phenacene thin-film FETs is currently 21 cm 2  V −1 s −1 .…”

“…Thus, it has been found that phenacenes are very suitable molecules for use in FET devices. Furthermore, because of their deep highest occupied molecular orbital (HOMO) and the wide gap between their HOMO and their lowest unoccupied molecular orbital (LUMO), phenacene molecules are known to be more stable than acene-type molecules9, which is another advantage when using phenacene-type molecules in FET.…”

Synthesis of Multiply Substituted Polycyclic Aromatic Hydrocarbons by Iridium‐Catalyzed Annulation of Ring‐Fused Benzocyclobutenol with Alkyne through C−C Bond Cleavage

“…[4] On the other hand, many compounds based on angular PA Hs such as phenanthrene have exhibited remarkable pharmacological activities. [4] On the other hand, many compounds based on angular PA Hs such as phenanthrene have exhibited remarkable pharmacological activities.…”