Modulation Transfer Function Consequences of Planar Dense Array Geometries in Infrared Focal Plane Arrays

作     者：Pinkie, Benjamin Wichman, Adam R. Bellotti, Enrico 

作者机构：Boston Univ ECE Dept Boston MA 02215 USA 

出 版 物：《JOURNAL OF ELECTRONIC MATERIALS》 (电子材料杂志)

年 卷 期：2015年第44卷第9期

页      面：2981-2989页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：U.S. Army Research Laboratory through Collaborative Research Alliance (CRA) for MultiScale multidisciplinary Modeling of Electronic materials (MSME) 

主　　题：Infrared detectors numerical simulation modulation transfer function dense arrays HgCdTe 

摘      要：Finite-difference time-domain and finite element method simulations are used to evaluate two-dimensional spot-scan profiles of p-on-n double-layer planar heterostructure (DLPH) detector arrays with abrupt p-type diffusions. The modulation transfer function (MTF) is calculated from the spot-scan profiles. An asymmetric dark and photo current collection mechanism is identified and explained as a result of electric field bunching through the corners of polygonal diffusions in DLPH arrays. The MTF consequences of the asymmetric collection are studied for triangular, square, and hexagonal diffusions in square and hexagonal arrays. We show that the placement and shape of the diffusion relative to the pixel can modify the MTF by several percent. The magnitude of the effect is largest for diffusions with fewer degrees of rotational symmetry.