Photovoltaic phenomena in BiFeO3 multiferroic ceramics
Photovoltaic phenomena in BiFeO3 multiferroic ceramics
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DOI：
10.1063/1.3675984
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发表时间：
2012-03
影响因子：
3.2
通讯作者：
C.‐M. Hung;C. Tu;W. D. Yen;L. S. Jou;M.-D. Jiang;V. Schmidt
中科院分区：
文献类型：
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作者：
C.‐M. Hung;C. Tu;W. D. Yen;L. S. Jou;M.-D. Jiang;V. Schmidt
研究了BiFeO_3(BFO)陶瓷的开路光电压和短路光电流随激光波长(λ=373和532 nm)、光照强度和样品厚度的变化。在λ=373 nm的近紫外光照射下，BFO陶瓷表现出显著的光伏响应。光伏响应强烈地依赖于波长、光强度和样品厚度。光伏响应与光强之间的关系可用指数方程EoC=Es[1-EXP(-i/α)]和Jsc=Js[1-EXP(−i/β)]来描述。EoC、JSC、ES和JS分别是开路光电压(V/cm)、短路光电流密度(A/cm2)、饱和光电压(V/cm)和饱和光电流密度。研究表明，BFO陶瓷比WO_3掺杂的Pb1-xLax(ZryTiz)_(1-x/4O_3)陶瓷和Pb(Mg_(1/3Nb_(2/3))_(1-x)TixO_3)晶体具有更强的光伏响应。
Open-circuit photovoltage and short-circuit photocurrent were investigated in BiFeO3 (BFO) ceramics as functions of laser wavelength (λ = 373 and 532 nm), illumination intensity, and sample thickness. BFO ceramics exhibit significant photovoltaic responses under near-ultraviolet illumination of λ = 373 nm. The photovoltaic responses strongly depend on wavelength, light intensity, and sample thickness. The relation between photovoltaic responses and light intensity can be described by exponential equations, EOC = ES[1 – exp(–I/α)] and JSC = JS[1 – exp(−I/β)]. EOC, JSC, ES, and JS are open-circuit photovoltage (V/cm), short-circuit photocurrent density (A/cm2), saturated photovoltage (V/cm), and saturated photocurrent density, respectively. This work suggests that BFO ceramic exhibits stronger photovoltaic responses than the ferroelectric WO3-doped Pb1-xLax(ZryTiz)1-x/4O3 ceramics and Pb(Mg1/3Nb2/3)1-xTixO3 crystals.