物理化学学报 >> 1995, Vol. 11 >> Issue (09): 812-817.doi: 10.3866/PKU.WHXB19950910

研究论文 上一篇    下一篇

CeO2纳米晶的光伏特性和量子尺寸效应

王德军, 崔毅, 张杰, 李铁津, 董相廷, 洪广言   

  1. 吉林大学化学系,长春 130023|中国科学院应用化学研究所,长春 130022
  • 收稿日期:1994-11-08 修回日期:1995-03-02 发布日期:1995-09-15
  • 通讯作者: 王德军

Photovoltaic Properties and Quantum Size Effect in Nanocrystalline CeO2

Wang De-Jun, Cui Yi, Zhang Jie, Li Tie-Jin, Dong Xiang-Ting, Hong Guang-Yan   

  1. Department of Chemistry,Jilin University,Changchun 130023;Institute of Applied Chemistry,Academia Sinica,Changchun 130022
  • Received:1994-11-08 Revised:1995-03-02 Published:1995-09-15
  • Contact: Wang De-Jun

摘要:

对制备的CeO2纳米晶进行了反射吸收光谱研究,对其在300-450nm的宽带吸收指认为O2p→Ce 4f电荷转移跃迁,发现这个吸收带随着样品粒径变小而红移.利用表面光电压谱方法和场调制表面光电压谱方法对不同粒径的CeO2纳米晶的光伏特性进行了研究,并对吸收谱带进行了解析.当样品粒径达到纳米尺寸时,在CeO2价带上大约0.9eV处明显地形成一个新能带.这个能带具有较强的定域性,在相应的跃迁的过程中产生具有量子限域特性的光生电子和空穴的激子对.

关键词: 纳米晶, CeO2, 表面光电压谱, 量子尺寸效应

Abstract:

Different size nanocrystallines CeO2 were synthesized and their diffuse reflectance absorption spectra have been measured. The absorption band in the region from 300 to 450 nm was assigned to the O2p-Ce 4f transition. It was found that a strongly red-shifted broad continuum of the absorption band occured as the decrease of the partical size. We have also measured the surface photovoltage as function of wavelength by SPS technique. And the absorption band was resolved to two peaks with different photovoltaic properties. Photovoltaic quantum size effect was observed by FMSPS measurement.

Key words: Nanocrystalline, CeO2, Surface photovoltage, Quantum size effect