Development of two-photon photoelectron yield spectroscopy towards determination of energy of transient species

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17975
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Device related chemistry
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: Hosokai Takuya 国立研究開発法人産業技術総合研究所, 分析計測標準研究部門, 研究員 (90613513)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 励起状態 / 励起準位 / 光電子収量法 / パルスレーザ

Outline of Final Research Achievements

In this study, I have proposed new idea that enables determination of ionization energy of transient species, i.e., excited singlet state and triplet state, of organic semiconducting thin films, so-called time-resolved two photon photoelectron yield spectroscopy (2P-PYS). By constructing a prototype of the experimental set-up of 2P-PYS, I tested the idea by using pentacene thin films grown on ITO substrates. Using Nd:YAG sub-ns pulse laser, I confirmed that the detection of photoelectron emission is possible from an excited triplet state of the thin films. Further, I revealed that the very intense pulse laser is problematic to determine the energy of the excited state. An appropriate intense pulse laser and experimental condition are needed to be found for the next and final step.

Free Research Field

有機半導体物性