Abstract
High air stability is the key issue for the organic thin film transistors (OTFTs). Recently developed high-mobility organic semiconductors, 2,7-diphenyl[1]benzothieno[3,2-b][1]benzothiophene (DPh-BTBT) and dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (DNTT), are much more stable than pentacene. We measured the ultraviolet photoelectron spectra (UPS) of DPh-BTBT and DNTT and revealed that their HOMOs are situated at deeper energy levels than that of pentacene, which contributes to their high stability. The UPS of DNTT is well reproduced by the DFT calculation, while that of DPh-BTBT is not fully reproduced. This difference is discussed in terms of dihedral angle between the phenyl groups and the BTBT ring.
| Original language | English |
|---|---|
| Pages (from-to) | 55-57 |
| Number of pages | 3 |
| Journal | Chemical Physics Letters |
| Volume | 563 |
| DOIs | |
| Publication status | Published - Mar 20 2013 |
| Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
Fingerprint Dive into the research topics of 'Ultraviolet photoelectron spectra of 2,7-diphenyl[1]benzothieno[3,2-b][1] benzothiophene and dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene'. Together they form a unique fingerprint.
Cite this
Yagi, H., Miyazaki, T., Tokumoto, Y., Aoki, Y., Zenki, M., Zaima, T., Okita, S., Yamamoto, T., Miyazaki, E., Takimiya, K., & Hino, S. (2013). Ultraviolet photoelectron spectra of 2,7-diphenyl[1]benzothieno[3,2-b][1] benzothiophene and dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene. Chemical Physics Letters, 563, 55-57. https://doi.org/10.1016/j.cplett.2013.02.011