PN结分别制备在HgCdTe外延薄膜材料的Cd组分非线性分布区和线性分布区的高组分端，研究了具有组分梯度的HgCdTe探测器的光电特性。计算不同温度下组分梯度产生的内建电场，结果显示Cd组分线性分布产生的内建电场在100～200 V/cm，而Cd组分非线性分布使得样品表面薄层的内建电场高达2 000 V/cm，推测组分梯度产生的内建电场对光生少子运动的影响是引起两个样品光电性能差异的主要原因。通过分析样品响应率随温度的三种不同变化趋势，提出利用温度调控组分梯度产生的内建电场，有利于降低空间电荷效应，为大注入下提高HgCdTe探测器的饱和阈值提供了一种新的设计思路。

针对不同项目研制过程中碲镉汞线列光导器件在筛选测试和应用中出现的失效模式进行了归纳和总结，并综合碲镉汞材料参数、器件结构尺寸、器件物理、器件制备工艺和器件测试等几个方面因素对器件失效的可能原因进行了分析，首次提出碲镉汞线列光导器件的优值因子作为失效判据，为进一步理解碲镉汞线列光导器件的物理机理以及更好优化器件的筛选过程提供了参考，为碲镉汞线列光导器件应用中出现的失效问题提供了分析和解决的方向。

To measure the global atmospheric three-dimensional distribution and change of temperature and humidity is one of the key areas in atmospheric remote sensing detection; it is also a new research and development direction in the field of meteorological satellite application. As a main element of China second generation of geostationary meteorological satellite Fengyun 4 (FY-4), which was launched on Dec. 11, 2016, the Geostationary Interferometric Infrared Sounder (GIIRS) is the first interferometric infrared sounder working on geostationary orbit internationally. It is used for vertical atmospheric sounding and gains atmospheric temperature, humidity, and disturbances. The combination of Fourier transform spectrometer technology and infrared detectors makes GIIRS have high spectral resolution and large coverage over spatial areas. With this kind of instrument, meteorological satellites can improve the capabilities for severe weather event monitoring and numerical weather prediction. Here a concise review of the GIIRS development project, including its history, missions and functions, technical design, key technologies, system integration, calibration and in-orbit operation status, etc., is presented.