Enhanced performance of sandwich structure Pb0.8La0.1Ca0.1Ti0.975O3 thin film for pyroelectric applications
Enhanced performance of sandwich structure Pb0.8La0.1Ca0.1Ti0.975O3 thin film for pyroelectric applications
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DOI：
10.1016/j.matlet.2009.05.020
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发表时间：
2009-08
影响因子：
3
通讯作者：
Q. Chi;W. Li;W. Fei;Y. Zhao
中科院分区：
文献类型：
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作者：
Q. Chi;W. Li;W. Fei;Y. Zhao
利用Pb0.8La0.1Ca0.1Ti0.975O3(PLCT)薄膜的低温晶化和高取向的优点，本研究获得了致密的PLCT/多孔PLCT/致密PLCT三明治结构。研究发现，致密的PLCT层既能维持芯层的孔道密度，又能使夹层结构具有较好的择优取向。在三明治结构中，同时获得了低介电常数(εr=43)和低漏电流密度(J<；9×10−5A/cm~2)。由于夹层结构的高取向，热释光系数(p>；185µC/m2K)仍然保持着较大的值。由此产生的高品质因数(Fv‘=4.5µC/M2K，Fd’=228µC/M2K)使三明治结构薄膜成为热释电薄膜器件的理想候选者。
Using the advantages of low-temperature crystallization and high orientation in Pb0.8La0.1Ca0.1Ti0.975O3(PLCT) film, a dense PLCT/porous PLCT/dense PLCT sandwich structure was obtained in the present study. It is found that dense PLCT layer can both sustain the porous density in the core layer and also lead to better preferential orientation of the sandwich structure. In the sandwich structure, low dielectric constant (εr=43) and leakage current density (J<9×10−5A/cm2) are simultaneously achieved. Because of high orientation in sandwich structure, the pyrocoefficient (p>185 µC/m2K) is still keeping a relatively large value. The resulting high figure of merit (FV′=4.5 µC/m2K, Fd′=228 µC/m2K) make the sandwich structure films good candidate for pyroelectric thin-film devices.