2003 Fiscal Year Final Research Report Summary
Research on GaN Light Emitting Devices on Quasi-Single Crystal Metal Substrates
| Project/Area Number |
14205123
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
無機工業化学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
FUJIOKA Hiroshi The University of Tokyo, School of Engineering, Associate Professor, 大学院・工学系研究科, 助教授 (50282570)
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| Project Period (FY) |
2002 – 2003
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| Keywords | GaN / Light Emitting Devices / Quasi-Single Crystal Substrates / Epitaxial Growth / MBE / PLD / Display Devices / Interface Buffer Layers |
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| Research Abstract |
The purpose of this project is to develop a growth technique of high quality GaN crystals on the quasi-single crystal metal substrates and to demonstrate the feasibility of this technique for the application of the low power large area displays, mobile paper displays, and high efficiency lighting. It is true GaN and its related crystals have been regarded as promising materials for full color large area displays, but these materials suffer from several serious problems which include its high cost and small area. Recently, we have found that the grain size of metal substrates can be reached to several meters with annealing under well-controlled conditions and that high quality GaN and related compounds such as AlN and InGaN grow on the metal substrates. Since the grain size is much larger than the carrier diffusion length, we can expect fabrication of high efficiency large area light displays at low cost with the use of the metal substrates. For the successful epitaxial growth of semiconductors on metal substrates, cleaning process of the metal surfaces and formation of high quality buffer layers are inherently important. We have found that atomically flat metal surfaces can be achieved with the precise control of pH values during polishing and with the use of In plasma just before the growth of the buffer layers. We have also found that film quality of the buffer layer can be improved with the use of radio frequency plasma radical source. With these techniques, we have succeeded in growing high quality GaN crystals with strong near band edge emission on metal quasi-single crystal metal substrates.
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