Leakage current conduction in IrO₂/PZT/Pt structures

Poling of soft piezoceramic PZT

“…Region I: Maxwell-Wagner polarization, [25][26][27][28][29] Region II: polarization switching [11][12][13][14][15][16][17][18] and Region III: steady-state conduction current. 10 We assume that the low-field curves (Fig.…”

“…Applying a poling dc field to a ferroelectric ceramic leads to so-called Maxwell-Wagner polarization [25][26][27][28][29] indicated by an initial current which is decaying by time constant τ = R B C GB , where, according to Waser, 25-28 R B is the grain bulk resistance and C GB is the grain boundary capacitance. The current decays as…”

Electrical properties of LaB 6 /PZT/Ag structure with asymmetric interface charge distribution

“…The 180 nm thick film shows the asymmetric J-V curve that depends very much on voltage polarity: the current values for direct bias are 10 2 times larger than those for reverse bias (negative potential is applied to Ag). Numerous physical models have been proposed to describe the leakage current behavior in PZT films: interface-controlled mechanisms (Schottky emission, tunnel emission) as well as bulk controlled mechanisms (Space Charge Limited Conduction, Pool-Frenkel emission) are reported [3][4][5][6]8,11]. Undoped PZT is reported to exhibit p-type conductivity, which is attributed to lead vacancies in the PZT unit cell [6].…”

“…A and k are the Richardson and Boltzmann constants, T -temperature, q-carrier charge, Φ B -barrier height, ε ssemiconductor permittivity, V=Ed is the applied electrical field, d is thickness, and ) 4 /( d q s πε α ≡ [8,12]. By plotting ln(J) vs V 1/2 , one would expect to find straight line.…”

“…Principal among these is the mechanisms controlling current-voltage (I-V) characteristics for a given electrode material [3][4]. In the most studies of capacitors based on PZT employed noble metal (Pt, Au, Ag) or oxide (SrRuO 3 , ITO, La 0.5 Sr 0.5 CoO) electrodes [5][6][7][8]. Up until now, there have been no reports on PZT/LaB 6 system in which LaB 6 is used as electrode.…”