Archive: 2011 - Moldavian Journal of the Physical Sciences

05 Feb 2011

2011
V. 10
1
(p.65 - 74)

Absorption and photoconductivity of PbMoO4 crystals

Authors:

Muşinschi, Valeriu; Caraman, Mihail; Muşinschi, C

Summary:

Spectral characteristics of the fundamental absorption coefficient and photoconductivity of PbMoO4 crystals with two polarizations in a temperature range of 77 to 300 K are investigated. The measurements of light transmitted in the polarized radiation for both orientations ( E|| C4 and E ┴ C4, C4 is the [001] crystallographic direction corresponding to the optical axis) of crystals are carried out. Spectral dependence of the absorption coefficient at the edge absorption (λ ≈ 0.3-0.5 μm) shows that the edge absorption is determined by indirect assisted by phonons transitions. The measured spectral dependence of the absorption coefficient at two orientations of polarization of light and the known theoretical dependence were combined and compared for determination the types of optical transitions in the fundamental absorption of PbMoO4 crystals. Limited energies Eg ind and Eg dir for E|| C4 and E ┴ C4 were found. A detailed investigation of the fundamental absorption of PbMoO4 crystals is presented. A simple model of band structure of crystals is proposed. The photoconductivity of PbMoO4 single crystals is investigated on E|| C4 and E ┴ C4 at 300 K in the fundamental absorption spectral region of 2.8 to 5.0 eV. The spectral dependence of the photoconductivity is studied and discussed in conjunction with reported optical data. The monopolar character of the photoconductivity was confirmed by investigation time-of-flight motion of carriers. The present study reveals only the intrinsic photoconductivity in PbMoO4 pure single crystals. Spectral responses of the photocurrent through PbMoO4 crystals showed one spectral band in a range of 3.1 to 5.0 eV with maximums at 3.45 and 3.73 eV for E|| C4 and E ┴ C4, respectively. A good correlation of the photoconductivity bands at E|| C4 and E ┴ C4 with absorption bands at also polarizations has been demonstrated. The unipolar time-of flight motion of carriers was analyzed, and drift mobility of electrons and its temperature dependence were determined.

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<meta name="citation_author" content="Caraman, Mihail">
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PbMoO4 crystals with  two polarizations  in a  temperature range of 77  to 300 K are  investigated. 
The measurements of light transmitted in the polarized radiation for both orientations ( E|| C4 and 
E ┴ C4,   C4  is  the [001] crystallographic direction corresponding  to  the optical axis) of crystals 
are carried out. 
Spectral dependence of  the absorption coefficient at  the edge absorption  (λ ≈ 0.3-0.5 μm) 
shows that the edge absorption is determined by indirect assisted by phonons transitions. The  measured  spectral  dependence  of  the  absorption  coefficient  at  two  orientations  of 
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Limited energies Eg
ind
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 for E|| C4 and E ┴ C4 were found. A detailed investigation of the 
fundamental  absorption  of  PbMoO4  crystals  is  presented. A  simple model  of  band  structure  of 

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the photoconductivity is studied and discussed in conjunction with reported optical data.  
The monopolar character of  the photoconductivity was confirmed by  investigation  time-of-flight 
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BibTeX

@article{ibn_4307,
author = {Muşinschi, V. and Caraman, M.I. and Muşinschi, C.},
title = {Absorption and photoconductivity of PbMoO4 crystals  },
journal = {Moldavian Journal of the Physical Sciences},
year = {2011},
volume = {10 (1)},
pages = {65-74},
month = {Feb},
abstract = {(EN) Spectral characteristics of the fundamental absorption coefficient and photoconductivity of 
PbMoO4 crystals with  two polarizations  in a  temperature range of 77  to 300 K are  investigated. 
The measurements of light transmitted in the polarized radiation for both orientations ( E|| C4 and 
E ┴ C4,   C4  is  the [001] crystallographic direction corresponding  to  the optical axis) of crystals 
are carried out. 
Spectral dependence of  the absorption coefficient at  the edge absorption  (λ ≈ 0.3-0.5 μm) 
shows that the edge absorption is determined by indirect assisted by phonons transitions. The  measured  spectral  dependence  of  the  absorption  coefficient  at  two  orientations  of 
polarization  of  light  and  the  known  theoretical  dependence were  combined  and  compared  for 
determination  the  types of optical  transitions  in  the fundamental absorption of PbMoO4 crystals. 
Limited energies Eg
ind
 and Eg
dir

 for E|| C4 and E ┴ C4 were found. A detailed investigation of the 
fundamental  absorption  of  PbMoO4  crystals  is  presented. A  simple model  of  band  structure  of 

crystals is proposed. The photoconductivity of PbMoO4 single crystals  is  investigated on E|| C4 and E ┴ C4   at 
300 K in the fundamental absorption spectral region of 2.8 to 5.0 eV. The spectral dependence of 
the photoconductivity is studied and discussed in conjunction with reported optical data.  
The monopolar character of  the photoconductivity was confirmed by  investigation  time-of-flight 
motion of carriers. The  present  study  reveals  only  the  intrinsic  photoconductivity  in  PbMoO4  pure  single 
crystals.  Spectral  responses  of  the  photocurrent  through  PbMoO4  crystals  showed  one  spectral 
band  in  a  range of 3.1  to 5.0  eV with maximums  at 3.45  and 3.73  eV  for E|| C4  and E ┴ C4, 
respectively. 
  A good correlation of the photoconductivity bands at E|| C4 and E ┴ C4 with absorption 
bands  at  also  polarizations  has  been  demonstrated.  The  unipolar  time-of  flight  motion  of 

carriers was  analyzed,  and  drift mobility  of  electrons  and  its  temperature  dependence were 
determined.  },
url = {https://ibn.idsi.md/vizualizare_articol/4307},
}

DataCite

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<titles>
<title xml:lang='en'>Absorption and photoconductivity of PbMoO4 crystals  </title>
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<description xml:lang='en' descriptionType='Abstract'>Spectral characteristics of the fundamental absorption coefficient and photoconductivity of 
PbMoO4 crystals with  two polarizations  in a  temperature range of 77  to 300 K are  investigated. 
The measurements of light transmitted in the polarized radiation for both orientations ( E|| C4 and 
E ┴ C4,   C4  is  the [001] crystallographic direction corresponding  to  the optical axis) of crystals 
are carried out. 
Spectral dependence of  the absorption coefficient at  the edge absorption  (λ ≈ 0.3-0.5 μm) 
shows that the edge absorption is determined by indirect assisted by phonons transitions. The  measured  spectral  dependence  of  the  absorption  coefficient  at  two  orientations  of 
polarization  of  light  and  the  known  theoretical  dependence were  combined  and  compared  for 
determination  the  types of optical  transitions  in  the fundamental absorption of PbMoO4 crystals. 
Limited energies Eg
ind
 and Eg
dir

 for E|| C4 and E ┴ C4 were found. A detailed investigation of the 
fundamental  absorption  of  PbMoO4  crystals  is  presented. A  simple model  of  band  structure  of 

crystals is proposed. The photoconductivity of PbMoO4 single crystals  is  investigated on E|| C4 and E ┴ C4   at 
300 K in the fundamental absorption spectral region of 2.8 to 5.0 eV. The spectral dependence of 
the photoconductivity is studied and discussed in conjunction with reported optical data.  
The monopolar character of  the photoconductivity was confirmed by  investigation  time-of-flight 
motion of carriers. The  present  study  reveals  only  the  intrinsic  photoconductivity  in  PbMoO4  pure  single 
crystals.  Spectral  responses  of  the  photocurrent  through  PbMoO4  crystals  showed  one  spectral 
band  in  a  range of 3.1  to 5.0  eV with maximums  at 3.45  and 3.73  eV  for E|| C4  and E ┴ C4, 
respectively. 
  A good correlation of the photoconductivity bands at E|| C4 and E ┴ C4 with absorption 
bands  at  also  polarizations  has  been  demonstrated.  The  unipolar  time-of  flight  motion  of 

carriers was  analyzed,  and  drift mobility  of  electrons  and  its  temperature  dependence were 
determined.  </description>
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<dc:creator>Muşinschi, V.</dc:creator>
<dc:creator>Caraman, M.I.</dc:creator>
<dc:creator>Muşinschi, C.</dc:creator>
<dc:date>2011-02-05</dc:date>
<dc:description xml:lang='en'>Spectral characteristics of the fundamental absorption coefficient and photoconductivity of 
PbMoO4 crystals with  two polarizations  in a  temperature range of 77  to 300 K are  investigated. 
The measurements of light transmitted in the polarized radiation for both orientations ( E|| C4 and 
E ┴ C4,   C4  is  the [001] crystallographic direction corresponding  to  the optical axis) of crystals 
are carried out. 
Spectral dependence of  the absorption coefficient at  the edge absorption  (λ ≈ 0.3-0.5 μm) 
shows that the edge absorption is determined by indirect assisted by phonons transitions. The  measured  spectral  dependence  of  the  absorption  coefficient  at  two  orientations  of 
polarization  of  light  and  the  known  theoretical  dependence were  combined  and  compared  for 
determination  the  types of optical  transitions  in  the fundamental absorption of PbMoO4 crystals. 
Limited energies Eg
ind
 and Eg
dir

 for E|| C4 and E ┴ C4 were found. A detailed investigation of the 
fundamental  absorption  of  PbMoO4  crystals  is  presented. A  simple model  of  band  structure  of 

crystals is proposed. The photoconductivity of PbMoO4 single crystals  is  investigated on E|| C4 and E ┴ C4   at 
300 K in the fundamental absorption spectral region of 2.8 to 5.0 eV. The spectral dependence of 
the photoconductivity is studied and discussed in conjunction with reported optical data.  
The monopolar character of  the photoconductivity was confirmed by  investigation  time-of-flight 
motion of carriers. The  present  study  reveals  only  the  intrinsic  photoconductivity  in  PbMoO4  pure  single 
crystals.  Spectral  responses  of  the  photocurrent  through  PbMoO4  crystals  showed  one  spectral 
band  in  a  range of 3.1  to 5.0  eV with maximums  at 3.45  and 3.73  eV  for E|| C4  and E ┴ C4, 
respectively. 
  A good correlation of the photoconductivity bands at E|| C4 and E ┴ C4 with absorption 
bands  at  also  polarizations  has  been  demonstrated.  The  unipolar  time-of  flight  motion  of 

carriers was  analyzed,  and  drift mobility  of  electrons  and  its  temperature  dependence were 
determined.  </dc:description>
<dc:source>Moldavian Journal of the Physical Sciences 10 (1) 65-74</dc:source>
<dc:title>Absorption and photoconductivity of PbMoO4 crystals  </dc:title>
<dc:type>info:eu-repo/semantics/article</dc:type>
</oai_dc:dc>

“ ... ”

SM ISO690:2012

MUŞINSCHI, Valeriu; CARAMAN, Mihail; MUŞINSCHI, C. Absorption and photoconductivity of PbMoO4 crystals . In: Moldavian Journal of the Physical Sciences. 2011, nr. 1(10), pp. 65-74. ISSN 1810-648X.