Photo-stable organic thin-film transistor utilizing a new indolocarbazole derivative for image pixel and logic applications

Ji Hoon Park, Hee Sung Lee, Soohyung Park, Sung Wook Min, Yeonjin Yi, Cheon Gyu Cho, Jiwon Han, Tae Woong Kim, Seongil Im

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Small molecule pentacene layer has been a representative among many organic thin-film transistor (OTFT) channels with decent p-type mobilities, but it is certainly light-sensitive due to its relatively small highest occupied molecular orbital-lowest unoccupied molecular orbital (HOMO-LUMO) gap (1.85 eV). Although a few other small molecule-based layers have been reported later, their photo-stabilities or related device applications have hardly been addressed. Here, a new photostable organic layer is reported, heptazole (C 26H16N2), which has almost the same HOMO level as that of pentacene but with a higher HOMO-LUMO gap (≈2.95 eV). This heptazole OTFT displays a decent mobility comparable to that of conventional amorphous Si TFTs, showing good photostability unlike pentacene OTFTs. An image pixel driving the photostable heptazole OTFT connected to a pentacene/Al Schottky photodiode is demonstrated. This heptazole OTFT also conveniently forms a logic inverter coupled with a pentacene OTFT, sharing Au for source/drain. A new indolocabazole derivative (heptazole) possessing a HOMO-LUMO gap of ≈2.95 eV is synthesized and shows good photo-stability unlike old pentacene. An image pixel driving our photostable heptazole OTFT connected to a pentacene/Al Schottky photodiode is demonstrated. The heptazole OTFT also conveniently forms a logic inverter coupled with a pentacene OTFT, sharing Au for source/drain.

Original languageEnglish
Pages (from-to)1109-1116
Number of pages8
JournalAdvanced Functional Materials
Volume24
Issue number8
DOIs
Publication statusPublished - 2014 Feb 26

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Photo-stable organic thin-film transistor utilizing a new indolocarbazole derivative for image pixel and logic applications'. Together they form a unique fingerprint.

  • Cite this