Optical characterization of CdS nanocrystals in Al[sub 2]O[sub 3] matrices fabricated by ion-beam synthesis

Matsuura, D.; Kanemitsu, Y.; Kushida, T.; White, C. W.; White, C.W.; Budai, J. D.; Budai, J.D.; Meldrum, A.
October 2000
Applied Physics Letters;10/9/2000, Vol. 77 Issue 15
Academic Journal
We have studied optical properties of CdS nanocrystals formed by sequential Cd[sup +] and S[sup +] ion implantation into Al[sub 2]O[sub 3] matrices. Two bands related to free excitons in the wurtzite CdS are clearly observed in the absorption spectrum at low temperatures. Efficient photoluminescence (PL) appears near the absorption edge. At high temperatures, the band edge PL band consists of two components. One is the free-exciton emission with a short lifetime (several hundreds of picoseconds), while the other is the bound exciton emission at shallow localized states with a long lifetime (several nanoseconds). The temperature dependence of the band gap energy has been determined for wurtzite CdS nanocrystals. Spectroscopic analysis shows that high-quality compound semiconductor nanocrystals are fabricated by the ion-beam synthesis technique. © 2000 American Institute of Physics.


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