| Project/Area Number |
18350099
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Functional materials/Devices
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| Research Institution | Kyushu University |
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Principal Investigator |
FUJITA Katsuhiko Kyushu University, Institute for Materials Chemistry and Engineering, Associate Professor (20281644)
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| Co-Investigator(Kenkyū-buntansha) |
TSUTSUI Tetsuo KYUSHU UNIVERSITY, Institute for Materials Chemistry and Engineering, Professor (40037982)
KATAHIRA Yoshiko KYUSHU UNIVERSITY, Graduate School for Engineering Science, Assistant Professor (90315143)
YASUDA Takeshi KYUSHU UNIVERSITY, Institute for Materials Chemistry and Engineering, Assistant Professor (30380710)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,200,000 (Direct Cost: ¥15,300,000、Indirect Cost: ¥900,000)
Fiscal Year 2007: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2006: ¥12,300,000 (Direct Cost: ¥12,300,000)
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| Keywords | Ultra-thin film / Nano-materials / Organic semiconductor / Organic electroluminescence / Display |
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| Research Abstract |
We have developed a novel method which enables preparing organic thin films from a highly diluted solution at the concentration of 1 ppm. This meshed, the Evaporative Spray Deposition from Ultradilute Solution (ESDUS), has also realized to construct layer-by-layer deposition of polymer semiconductors without damaging a preceding first layer. Polymer light emitting diodes (PLEDs) and photovoltaic cells with polymer layered structures are fabricated by ESDUS and the device performances are investigated.
The PLED structures are; a bi-layer device (A): ITO/PEDOTPSS/PFO/CN-PDHFV/LiF/Al, single-layer devices with spin-coating (B) and ESDUS (C): ITO/PEDOTPSS/CN-PDBFV/LiF/Al.
The external quantum efficiency (EQE^%) was improved more than an order of magnitude in A. The EQE curve was flat throughout a current region while those of B and C showed a gradual increase. The flat tendency of A indicates that the carriers are confined at the polymer/polymer interface.
The bilayer structure, PFO/CN-PDHFV, was also applied to bilayer photovoltaic cells and able to improve photovoltaic performance compared to conventional blend cells. It would be understood that the improvement likely arose from the effective prevention of the carriers being corrected at the inappropriate counter electrodes.
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