enhanced charge injection and photocurrent in ferroelectric liquid crystals

2016 Fiscal Year Final Research Report

• Project/Area Number: 26630124
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Electronic materials/Electric materials
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Hanna Jun-ichi 東京工業大学, 科学技術創成研究院, 研究員 (00114885)
• Research Collaborator: Higuchi Miho ; Dogishi Masaki
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 液晶 / 強誘電性 / 電荷注入 / キラルスメクチックC

Outline of Final Research Achievements

According to the experimental results, it is concluded that enhanced charge injection in a ferroelectric liquid crystalline phase was not governed by ferroelectricity, i.e., remanent polarization of the material, but by the dipole of the molecule aligned at the electrode interface. Therefore, the present phenomena is not limited in ferroelectric liquid crystals, and will be found in various liquid crystalline materials with large dipole.
On the other hand, it is concluded that photoconductivity without external biases observed in polarized ferroelectric liquid crystals is attributed to the effect of internal electric field caused by polarization of the liquid crystal on photo-generation of charges and their charge transport. This generality should be confirmed by using other ferroelectric liquid crystals.

Free Research Field

有機半導体材料・デバイス