物理学报Issue(6)：393-397,5.DOI:10.7498/aps.62.067701
铁电薄膜漏电流的应变调控
Strain control of the leakage current of the ferroelectric thin films∗
摘要
Abstract
Combining nonequilibrium Green’s functions and first-principles quantum transport calculations in density-functional theory, we investigate the effect of biaxial strain on the leakage current of BaTiO3 ferroelectric thin film. The results show that the compressive strain can effectively reduce the leakage current of ferroelectric thin film. Especially when the compressive strain is 4%, the leakage current will be reduced by nearly 10 times that of strain-free case. By calculating the transmission coefficient and the density of states, we find that the transmission probability of ferroelectric tunnel junction with compressive strain is smaller than that with tensile strain. Moreover, we find that the valence band shifts toward the lower energy zone while the conduction band moves toward the high energy zone, which leads to the enlarged energy band gap, thereby reducing the leakage current. Our study suggestes a suitable way to reduce the ferroelectric thin film leakage current and improve the performance of ferroelectric thin film and its relevant ferroelectric memory.关键词
铁电薄膜/双轴应变/漏电流/第一性原理Key words
ferroelectric thin films/double axis strain/the leakage current/first principle引用本文复制引用
娟辉,杨琼,曹觉先†,周益春..铁电薄膜漏电流的应变调控[J].物理学报,2013,(6):393-397,5.基金项目
重庆市科委自然科学基金(批准号:2010BA6002)、复旦大学应用表面物理国家重点实验室开放课题(批准号:KL201106)、国家自然科学基金(批准号:10974157)和国家级大学生创新训练计划(批准号:201210635129)资助的课题 （批准号:2010BA6002）
