【作者】 李秀峰；

【导师】 曾亦可；

【作者基本信息】 华中科技大学 ， 微电子学与固体电子学， 2006， 硕士

【摘要】 铁电材料的铁电性能主要由电滞回线、I-V特性和开关特性等反映出来。铁电材料在电极化强度与电场强度间的关系上呈现电滞回线,在电流与电压关系上呈现I-V特性,在电流与时间关系上呈现开关特性。本文研制出一套测量铁电材料电性能参数的计算机辅助自动测试系统,整个系统由硬件和软件两部分组成。系统硬件的主要功能是对铁电材料的各种电性能参数如电滞回线、I-V特性及开关特性等进行测量、控制和采集,完成铁电材料各种电性能参数的原始数据测量。它主要由铁电材料参数测试模块、数字存储示波器和控制模块等三部分组成。铁电材料参数测试模块主要由信号发生器、均衡器、缓冲器、功率驱动器和高压发生器等组成,可输出正弦、三角、矩形和双极性双脉冲等多种波形;数字存储示波器完成波形显示和数据采集;控制模块由PCI-1734卡和逻辑控制电路组成,完成按钮和旋钮的逻辑和物理功能。系统软件由通讯模块和界面模块两部分组成:通讯模块实现初始化示波器和从示波器读取波形数据;界面模块由登陆窗体、衰减窗体、主窗体和参数设置窗体组成,实现了单通道和合成曲线移动、互相切换的功能;具有波形分析功能,实现了合成曲线中心对称和相移功能;计算剩余极化强度Pr、饱和极化强度Ps和矫顽场Ec等电性能参数;保存并打印波形数据和采样电容、样品厚度、样品面积和测试频率等相关参数,方便了不同样品的性能比较。更多还原

【Abstract】 The electrical properties of ferroelectric materials are showed by the hysteresis loop, I-V characteristic and switching characteristic primarily. The hysteresis loop presents the relation between polarization and electric field. The I-V characteristic presents the relation between current and voltage. The switching characteristic presents the relation between current and time.The thesis focuses on developing a computer-aided system for measuring the ferroelectric materials’electrical parameters. The whole system consists of two parts: hardware and software.The function of the hardware is to measure the electrical properties of ferroelectric materials and to control the device for measuring the ferroelectric materials’electrical parameters,and to collect these original data. This part consists of three modules: the module of ferroelectric properties measuring, digital storage oscilloscope and control module. The module of ferroelectric properties measuring is comprised of signal generator, equalizer, buffer, power amplifier and high voltage generator. It can generate many kinds of signals such as sine wave, triangular wave, rectangular wave and bipolar double pulse. All these waves are basic stimulant signals for measuring the ferroelectric properties. The functon of digital storage oscilloscope is to display waveform and collect data.Control module is made of PCI-1734 card and logic control circuit,and completes the function of pbutton and knob.System software consists of communication and interface module: the communication module functions initializing digital oscilloscope and reading the data from digital oscilloscope. The interface module is made up of loading window, decaying window,main window and parameter setting window, the system can accomplish moving the single-channel and synthetic curves, switching the two types mentioned above. The system can play waveform analysis, phase shifting and centrosymmetry of the synthetic curves; Calculate ferroelectric electrical parameters; save and print waveform data such as sample capacitor, sample thickness, sample dimension and so on. The system makes the comparison between different samples more conveniently.更多还原