丝网印刷制备大面积多孔PZT热释电厚膜与器件

Infrared and Laser Engineering(2011)

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Abstract
采用丝网印刷法在氧化铝基片上制备了大面积多孔PbZr0.3Ti0.7O3热释电厚膜与单元红外探测器.通过掺入Li2CO3与Bi2O3作为助烧剂,实现了厚膜在850℃下的低温烧结.通过保持合适的孔隙率,将厚膜的相对介电常数降低至原值的1/5以提高材料优值与探测率.厚膜在1 kHz、25℃下的相对介电常数与损耗角正切分别为94与0.017.测试了厚膜相对介电常数与损耗随温度的变化规律,测得其居里温度为425℃.通过动态法测试得到厚膜的热释电系数为0.9×10-8 Ccm-2K-1.使用由斩波器调制的黑体辐射,测得单元器件在8.5~2217 Hz的电压响应与噪声,计算出器件的探测率为3.4×107~1.7×108 cmHz1/2W-1.
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Key words
Pyroelectric,PZT,Screen-printing,Thick films
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