| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2011: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Research Abstract |
The quaternary semiconductor Cu2ZnSnSe4 and Cu2ZnSnS4 crystals were grown by the vertical Bridgman method. Optical absorption measurements indicate that both Cu2ZnSnSe4 and Cu2ZnSnS4 are direct-gap semiconductors, and having the band gap energies of 1.12 and 1.48 eV at 10 K, respectively. The thermoreflectance spectra reveal distinct structures at energies of the E0-E6 critical points (CP's). From the first-principle band-structure calculations, these CP's are assigned to specific points in the Brillouin zone.
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