硫化物半导体超微粒量子尺寸效应的光谱研究  

SPECTROMETRIC STUDY OF SIZE QUANTIZATION EFFECTS OF ULTRAFINE SULFIDE SEMICONDUCTOR PARTICLES

作　　者：范长宇[1] 李学萍[1] 张振宗[1] 肖绪瑞[1] 

机构地区：[1]中国科学院感光化学研究所,光电化学研究中心

出　　处：《感光科学与光化学》1995年第2期97-102,共6页Photographic Science and Photochemistry

基　　金：中科院光化学开放实验室;半导体超晶格国家重点实验室资助

摘　　要：用胶体化学方法在水溶液中制备了纳米硫尺寸硫化物半导体超微粒（ＣｄＳ、ＺｎＳ、ＰｂＳ、及Ｂｉ＿２Ｓ＿３），并用ＴＥＭ测得超微粒颗粒尺寸小于１０ｎｍ。本文详细研究了这些硫化物半导体超微粒的量子尺寸效应和光学性质以及制备过程中颗粒形成的化学环境与条件参数的影响。可以观察到它们收光谱及喇曼光谱（ＣｄＳ）的明显变化。采用合适的表面修饰剂和稳定剂、将溶液的ｐＨ控制在适当的范围以及金属离子的过量等，都可使超微粒的吸收光谱明显蓝移并出现结构峰。对于ＣｄＳ超微粒，其特征共振喇曼峰逐渐减弱直至最后消失。这些都表明了硫化物半导体超微粒尺寸逐渐减小而呈现出明显的量子尺寸效应。Nanometer sized sulfide semiconductor ultrafine particles(CdS,ZnS,PbS and Bi_2S_3)were prepared in aqueous solution by colloidal chemical methods. The particle sizes deter-mined by TEM are below 10 nm. The size quantum effects and optical properties of theresulfide ultrafine particles as well as the influence of the chemical enviroment and conditionparameters of particle formation in the preparation procedure were studied in detail.Significant changes were observed in optical absorption and Raman spectra.When add suitable surface modification agents and stabilizers,keep the solution pH in suitable range, present anexcess of metal ions,it can be found that the absorption edges shift to the shorter wave-length and pronounced structrued peaks exhibit,and characteristic resonance Raman peaks(for CdS particles)gradually decrease,indicating the decrease of particle sizes and clear sizequantum effects.

关 键 词：半导体 超微粒 量子尺寸效应 光谱 硫化物 

分 类 号：TN304.25[电子电信—物理电子学]