Clarification of Interfacial Levels of Insulating Polymeric Composite and Establishment of Its Control Method
Project/Area Number |
05650320
|
Research Category |
Grant-in-Aid for General Scientific Research (C)
|
Allocation Type | Single-year Grants |
Research Field |
Electronic materials/Electric materials
|
Research Institution | Fkui National College of Technology |
Principal Investigator |
KAWAMOTO Akira Fkui National College of Tech. Assistant Professor, 電気工学科, 助教授 (90110189)
|
Project Period (FY) |
1993 – 1994
|
Project Status |
Completed (Fiscal Year 1994)
|
Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1994: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1993: ¥900,000 (Direct Cost: ¥900,000)
|
Keywords | Composite / Photocarrier injection / Interface / Charge-exchange / Polymethyl-metacrylate / Polystirene / Donor level / Acceptor level / 分子イオン準位 / 仕事関数 / 接触電位差 / 光電導 / 帯電 |
Research Abstract |
As the charge-exchange rate at the insulator-insulato interface in insulating composetes is affected by the direction of the carrier transport and carrier species, but these have not yet been fully understood. Photocurrens on a PS (polystirene)-PMMA (polmethyl-methacrylate) twolayr composite were measured in order to clarify the carrier injection and the charge-exchange processes at the interface. It was found that electrons from the PMMA can pass the interface more easily than holes from the PMMA layr and holes from the PS layr can pass the interface more easily than electrons from the PS layr. These suggest that charge-exchange process can be explained by the Molecular Ion States Model. On the other hand, PS/PMMA contact charging experiments suggested that the donor and acceptor levels contribute to both contact charging and electronic charge transport at the interface. Photoinjection currents in PS and PMMA were measured in order to clarify the correlation of conduction levels in polymers with the charge-exchange processes at the interface. The analysis of the optical absorption spectra PS and the photoinjection of holes from the metal into the PS gave the contact barrier height (Au-PS-Au), donor level for hole transport and acceptor level for electron transport as 1.98 eV,and 2.4 eV respectively. These results of conduction levels coincided well with the results of the contact charge-exchange experiments between various metals and PS. On the other hand, a detailed study of the photoinjention of electrons into the PMMA determined the contact barrier height (Al-PMMA-Al), donor and acceptor levels for carrier transport as 0.29 eV,5.08 eV and 3.20 ev respectively. These results did not coincide well with the results of the contact charge-exchange experiments. These suggest that the anisotropy of electronic charge transoprt at the intrface in PS-PMMA composite can be explained by the donor and acceptor levels contributing to carrier transport in PS and PMMA.
|
Report
(3 results)
Research Products
(17 results)