Challenges for complete demonstration of charge carrier transport states in organic semiconductors based on ultra-high sensitivity photoelectron detection

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H05498
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Device related chemistry
• Research Institution: Tokyo University of Science
• Principal Investigator: Nakayama Yasuo 東京理科大学, 理工学部先端化学科, 講師 (30451751)
• Research Collaborator: TSURUTA Ryohei ; HIKASA Masataka ; YAMANAKA Soichiro ; YOSHIDA Koki ; MORI Toshiaki ; MIZUNO Yuta
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 半導体デバイス / ギャップ内準位 / 有機半導体 / 光電子分光 / 光電子収量分光 / 電子バンド / エピタキシャル成長 / モデル界面

Outline of Final Research Achievements

While organic electronic devices have undergone rapid paced progress, fundamental mechanisms of charge carrier transport is still under debate mainly because of insufficient knowledge on the electronic structures of organic semiconductor materials. This study has targeted at complete demonstration of the electronic states which contribute to the charge carrier transport in the organic semiconductor materials through development of original photoemission measurement techniques of high-precision and high-sensitivity. As a representative achievement, valence band dispersion of the single crystal pentacene, a proto-typical p-type organic semiconductor molecule, were experimentally figured out for the first time. Inter-molecular transfer integral and the effective mass of conductive holes were derived from the present results, which suggests an intermediate character of the charge carrier transport between inter-molecular hopping of localized particles and continuous propagation of waves.

Free Research Field

材料化学