MECHANISM FOR HIGH-VOLTAGE PHOTOVOLTAIC EFFECT IN CERAMIC FERROELECTRICS
MECHANISM FOR HIGH-VOLTAGE PHOTOVOLTAIC EFFECT IN CERAMIC FERROELECTRICS
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DOI：
10.1007/bf02660182
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发表时间：
1975-01-01
影响因子：
2.1
通讯作者：
CROWNE, F
中科院分区：
文献类型：
--
作者：
BRODY, PS;CROWNE, F
在极化铁电陶瓷中看到的高压光电动势被解释为光诱导载流子筛选单个颗粒内部场的结果。内部场本身被解释为由自发极化产生的势被平衡载流子屏蔽的结果。小于带隙的电动势在单个颗粒之间产生；这些电动势加入陶瓷产生高压光电动势。模型给出了光电动势的极性和幅度，以及对温度、剩余极化和自发极化、介电常数和晶粒尺寸的依赖。计算结果与实验结果基本一致。
The high-voltage photo-emf seen in poled ferroelectric ceramics is explained as the result of light-induced carriers screening an internal field within the bulk of individual grains. The internal field itself is explained as the result of the shielding by equilibrium carriers of the potential produced by the spontaneous polarization. Less-than-band-gap emf’s are produced across individual grains; these emf’s add in ceramics to produce the high-voltage photo-emf. A model yields the polarity and magnitude of the photo-emf, the dependence on temperature, remanent and spontaneous polarization, dielectric constant and grain size. The calculated and experimental results are in general agreement.