TAILIEUCHUNG - Crystalline Silicon Properties and Uses Part 2

Tham khảo tài liệu 'crystalline silicon properties and uses part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 14 Crystalline Silicon - Properties and Uses Based on the results shown above a change in hierarchical structure based on a model of Wohler-siloxene multi-sheet layers separated by an Si-O-Si linkage at elevated pyrolysis temperatures followed by exposure to air is proposed in Fig. 12. Circularly polarized light from chiral SNPs The generation amplification and switching of circularly polarized luminescence CPL and circular dichroism CD by polymers Chen et al. 1999 Oda et al. 2000 Kawagoe et al. 2010 small molecules Lunkley et al. 2008 Harada et al. 2009 and solid surface crystals Furumi and Sakka 2006 Krause Brett 2008 Iba et al. 2011 have received considerable theoretical and experimental attention. 1S 2B 25 Scheme 5. Soluble optically-active SNPs bearing chiral organic groups. Wavelength nm Fig. 13. UV-visible PL CD and CPL spectra of 1S 2S and 2R in THF at 25 C. CPL is inherent to asymmetric luminophores in the excited state whereas CD is due to asymmetric chromophores in the ground state. The first chiroptical CPL and CD properties of three new SNPs bearing chiral alkyl side groups Fukao Fujiki 2009 were recently demonstrated for poly S -2-methylbutylsilyne 1S poly R -3 7-dimethyloctylsilyne 2R and poly S -3 7-dimethyloctylsilyne 2S Scheme 5 . Amorphous and Crystalline Silicon Films from Soluble Si-Si Network Polymers 15 This study revealed that only 1S bearing -branched chiral groups clearly showed an intense CPL signal at 570 nm with cPF of 1 along with corresponding Cotton CD signals in THF solution at room temperature Fig. 13 . In contrast 2R and 2S which possess Y-branched chiral groups did not exhibit any CPL signals although they did exhibit CD bands. By analogy to the optically inactive SNPs described above optically active SNPs might be candidates for use as Si-source materials in the production of a-Si and C-Si films that exhibit circular polarization via controlled vacuum pyrolysis. A Ge-Ge bonded network polymer GNP as an SNP analogue Our .

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