-Si∶H膜中反常瞬態(tài)響應的光譜影響
SPECTRA EFFECTS OF ANOMALOUS TRANSIENT RESPONSE IN -Si:H FILM
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摘要: 測量夾心結構-Si∶H膜的瞬態(tài)響應譜時,發(fā)現(xiàn)無論是在低的正向偏壓還是在低的反向偏壓下,起始部分都出現(xiàn)不正常的尖形脈沖,它的幅度隨光波長的增長而減小。零場瞬態(tài)譜的研究表明,這種不正常的非傳輸部分來源于結區(qū),它的升降特點決定于光照時的空間電荷限制光電流。從光電流幅值與光吸收系數(shù)的關系式,我們發(fā)展了一種確定光學隙的方法。
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Abstract: Transient photoresponse spectra in -Si: H film with sandwich structure are measured. It is found that at the starting part of these curves anomalous pulse appears under either a small forward bias or a small reverse one. The pulse amplitude decreases when the light wavelength increases. Analysis of the transient response spectra without bias, showed that this anomalous non-transport component originates from the barrier region. Its rise or deeay characteristic is determined by space-charge-limited photocurents. With the relation between its amplitude and optical absorption, we developed a method to obtain optical band gap of the films studied. -
海字涵等,電子科學學刊,5(1983), 361.[2]T. Datta and M. Silver,J.Phys., Colloq. C-4, 42(1981), 563.[3]海字涵,周忠毅,電子學通訊,4(1982), 248.[4]A. Many et al., Phys. Rev., 126(1962), 1980.[5]P. Mark et al., J. Appl. Phys., 33(1962), 205.[6]A. Rose, Concepts in Photoconductivity and Allied Problems, John Wiley Sons, Inc., 1963, p. 77.[7]R. Willians et al., RCA Rev., 40(1979), 371.[8]H. Fritzsche et al., Solid State Technology, Jan. 1978, 55.[9]R. J. Loveland et al.,J.Non-cryst. Sol., 13(1973/74), 55. -
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