Optical Spectra of Silicon Oligomers

概要

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Optical absorption spectra have been measured for finite-chain analogs of linear polysilane,silicon oligomers CH3[Si(CH3)3].CH3, with controlled chain length n(: 2 to 16). The intenselowest electronic absorption peak and its higher-lying side bands, which correspond to the one-dimensional exciton series in the infinite chain, shift to higher energy with decrease of the chainlength because of the confinement of the excited states. The oscillator strength of the mainabsorption peak increases with the chain length, while the linewidth of the rnain peak drasticallydecreases, especially in the region n : 2 to 6, These finite size effects of the electronic (excitonic)absorption are argued in terms of spatial extension of the excited states, motional narrowing andelectron correlation effect.
社団法人日本物理学会の論文
1996-06-15