SPECTRA OF ONE-DIMENSIONAL EXCITONS IN POLYSILANES WITH VARIOUS BACKBONE CONFORMATIONS

被引：83

作者：

TACHIBANA, H

MATSUMOTO, M

TOKURA, Y

MORITOMO, Y

YAMAGUCHI, A

KOSHIHARA, S

MILLER, RD

ABE, S

机构：

[1] UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN

[2] IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120

[3] ELECTROTECH LAB,TSUKUBA,IBARAKI 305,JAPAN

来源：

PHYSICAL REVIEW B | 1993年 / 47卷 / 08期

关键词：

D O I：

10.1103/PhysRevB.47.4363

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Linear and nonlinear optical spectra (one-photon and two-photon absorption, photoluminescence, and electroabsorption spectra) have been investigated for solid thin films of polysilanes with a variety of conformations, such as trans-planar, alternating trans-gauche (TGTG' type), 7/3 helical, and disordered backbone structures. Optical spectra have revealed features of one-dimensional exciton states characteristic of the respective conformations. In particular, the lowest allowed and second parity-forbidden (or two-photon allowed) transitions can be assigned to the ground (B-1(1u)) and first excited (1A(g)) states of one-dimensional Wannier-type exciton, respectively. Furthermore, the higher excited exciton states and subsequent band-to-band transitions show up in the electroabsorption spectra for polysilanes with various conformations of the Si backbones. Quantitative analysis based on a microscopic theory for the one-dimensional excitons is also presented.

引用

页码：4363 / 4371

页数：9

共 31 条

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