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Master's Dissertation
DOI
Document
Author
Full name
José Alberto Giacometti
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1977
Supervisor
Title in Portuguese
Decaimento de potencial de superfície em monocristais de naftaleno
Keywords in Portuguese
Decaimento de potencial de superfície
Monocristais orgânicos
Naftaleno
Transporte de cargas elétricas
Abstract in Portuguese
Usando a técnica de decaimento do potencial de superfície e de correntes termo estimuladas, foi investigado em cristais de naftaleno, o movimento de cargas elétricas injetadas por uma descarga corona. Os resultados obtidos nas medidas de decaimento, foram explicados satisfatoriamente usando um modelo teórico de transporte de cargas, na presença de armadilhas rasas e profundas. A partir desse modelo foram calculadas: a mobilidade modulada dos portadores, o tempo de captura das armadilhas profundas e estimada a sua seção de captura. Nas medidas de corrente termo-estimuladas, foram identificadas as armadilhas rasas e profundas e determinada as suas profundidades energéticas.
Title in English
Surface potential decay on naphtalene single crystals
Keywords in English
Electric charge transport
Naphtalene
Organic single crystals
Surface potential decay
Abstract in English
Using the method of surface potential decay, and thermal stimulated currents, it was possible to study the motion of electrical charges, injected in naphthalene single crystals, by a negative corona discharge in the air. The results obtained in the measurements of the decay, were explained by using a theoretical model of transport of charges in the presence of shallow and deep traps. With the help of this model, the trap modulated mobility of the carriers, the trapping time of the deep traps, and the capture cross section were calculated. In the measurements of thermal stimulated currents, it was possible to identify the deep and shallow traps and also to calculate their activation energies.
 
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Publishing Date
2009-10-23
 
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