Optical characterization for combinatorial systems based on semiconductor ZnO

Takayuki Makino, Gen Isoya, Yusaburo Segawa, Chinhau Chia, Takashi Yasuda, Masashi Kawasaki, Akira Ohtomo, Kentaro Tamura, Yuji Matsumoto, Hideomi Koinuma

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


We have developed the simultaneous optical measurement method by using the optic fiber bundles specialized for combinatorial samples combined with the arrayed charge coupled devices (CCD). This also can be used for experiments done at cryogenic temperatures. The smoother dependence upon various growth parameters could be obtained by virtue of the combinatorial fabrication method. Our present study revealed that the use of lattice-matched ScAlMgO4 substrates greatly improved the optical (excitonic) properties of epitaxial ZnO layers as well as ZnO-based quantum wells. The improved points by virtue of lattice-matching are as follows; (1) reduction of the nonradiative decay rate of excitons, (2) settlement of the undesired criterion of well-width, the limit to which the relevant quantum confinement can be achieved, (3) bright excitonic photoluminescence at room temperature as the result of increased quantum efficiency.

Original languageEnglish
Pages (from-to)28-35
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2000
EventCombinatorial and Composition Spread Techniques in Materials and Devices Development - San Jose, CA, USA
Duration: 2000 Jan 262000 Jan 26


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