新型热释电单晶材料与红外探测器的研究  

Research on New Pyroelectric Crystal Materials and Infrared Detectors

作　　者：李龙[1] 罗豪甦[1] 刘林华[1] 许晴[1] 赵祥永[1] 李晓兵[1] 徐海清[1] 林迪[1] 

机构地区：[1]中国科学院上海硅酸盐研究所(嘉定园区),上海201800

出　　处：《红外》2013年第1期12-15,共4页Infrared

基　　金：国家重点基础研究发展"973"计划项目(2009CB623305);国家科技攻关项目(2010BAK69B26);国家自然科学基金(60837003;50777065;61001041;11090332);上海市科学技术委员会(10520712700;10JC1415900;10dz0583400);上海硅酸盐研究所创新基金(099ZC4140 G;099ZC1110 G);上海启明星计划(11QA1407500)

摘　　要：主要阐述了当前热释电红外探测器的发展状况,并重点介绍了我国尤其是我们在新型热释电材料以及红外探测器方面的主要进展和成果。弛豫铁电单晶是一类具有优异压电性能的新型材料,同时我们发现该类晶体还具有优异的热释电性能。我们所生长的PMNT单晶的热释电系数超过15.3×10^(-4)cm^(-2).K^(-1),Mn-PMNT的介电损耗降至0.0005,探测优值达到40.2×10^(-5)Pa^(-1/2),高居里温度点单晶PIMNT的居里温度达到180℃以上。与合作单位一起利用该类晶体研制的红外探测器的性能远优于利用传统热释电材料(如LiTaO_3)制作的探测器,其比探测率达到1.07×10~9 cm·Hz^(1/2)/·W^(-1),说明利用该新型弛豫铁电单晶制作的红外探测器具有广阔的应用前景。The current status of pyroelectric infrared detectors is presented. The main advances ana achievements we obtained in new pyroelectric materials and infrared detectors are described in detail. Relaxation ferroelectric crystal is a new material with excellent piezoelectric property. It is found that it also has excellent pyroelectric property. The PMNT crystal we grew has a pyroelectric coefficient greater than 15.3×10^-4cm^-2·K^-1 The dielectric loss of Mn-PMNT is reduced to 0.0005. It has the optimal detection value up to 40.2×10^-5Pa^-1/2. The PIMNT crystal with a high Curie temperature point has the Curie temperature greater than 180 ℃. The infrared detector made of this crystal is much better than the detector made of traditional pyroelectric materials such as LiTaO3 in performance. It has the detectivity of 1.07×10^9cm·Hz^1/2·W^-1. This shows that the infrared detectors made of this new relaxation ferroelectric crystal has a wide application area.

关 键 词：热释电红外探测器 弛豫铁电单晶 PMNT 比探测率 

分 类 号：TN215[电子电信—物理电子学]