ISSP - The institute for Solid State Physics

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Yoshinobu Group
Professor
YOSHINOBU,
Jun

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Solid surfaces are intriguing objects, because novel structures and electronic properties emerge as a result of symmetry breaking of bulk. Solid surfaces play an important role as “low dimensional reaction field”, on which we can provide atoms and molecules and manipulate them deliberately. In addition, surface and interface are vital in the energy conversion and dissiparion processes. In order to fabricate atomically-controlled surface functional materials, we have to understand the dynamical behavior of atoms and molecules on surfaces. The research of these subjects is closely related to the basics of catalysis, semiconductor processes and molecular electronics. In addition, we can simulate chemical reactions on cosmic dust with laboratory experiments in ultrahigh vacuum at low temperature. We have utilized surface vibrational spectroscopy, photoelectron spectroscopy and local probe methods in order to investigate structures, reactions and electronic properties of atoms,molecules and thin films on surfaces. Synchrotron radiation (KEK-PF, SPring8 etc.) is also used to study electronic structure of surface and interface, including operando XPS.

(a) Optical microscopy image and (b) I vs. V curves for the TIPS-pentacene film measured by four GaIn tips. A square four-probe method was used to detect anisotropy in mobility. Two sets of I vs. V measurements were performed: parallel I23 vs. (V1V4) and perpendicular I21 vs. (V3V4), and they were plotted as a function of gate-to-channel bias VGV4 to remove the contact resistance. [Appl. Phys. Lett. 111 (2017) 073301].

Research Subjects

  1. Activation and surface reaction of small molecules by model catalysts
  2. Dynamical processes of atoms and molecules on solid surfaces
  3. Electronic states and surface conductivity of semiconductor and organic thin film
  4. Electronic states and reactivity of low-dimensional materials on surfaces
  5. Chemical reaction on solid surfaces under ambient conditions