Space charge limited transient currents and oxygen vacancy mobility in amorphous BaTiO3 thin films

Time-dependent transient currents were studied at elevated temperatures (200-220 degrees C) in amorphous barium titanate thin film capacitors. Current transients display a peak whose time position varies with applied voltage and temperature. The response is analyzed through space charge limited current transient theories. Extracted drift mobilities are in the 10(-11)-10(-12) cm(2) V-1 s(-1) range and show an activation energy of 1 eV. The phenomena are associated with oxygen vacancies migration in BaTiO3. (C) 2006 American Institute of Physics.