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基于衍射效应的C-MEMS悬浮结构的仿真和制备

发表时间:2012-11-30  浏览量:1130  下载量:483
全部作者: 龙胡,刘丹,习爽,徐亮亮,汤自荣
作者单位: 华中科技大学机械科学与工程学院,武汉光电国家实验室(筹)
摘 要: 提出了一个制造三维碳微机电系统(carbon-micro-electro-mechanical systems, C-MEMS)的悬浮结构制造体系。通过仔细分析三维C-MEMS的制造过程,发现光刻中的曝光过程决定悬浮结构能否形成,而后续的处理,如显影、烘烤将决定悬浮结构能否保留下来。因此,分析曝光过程中光学原理,建立了一个光学模型,该光学模型主要是基于衍射效应,通过模拟光刻中曝光过程光的传播,得到曝光过程中光刻胶表面光强的分布,从而解释曝光过程中悬浮结构的形成机理及各曝光参数对其的影响,并给予实验工艺指导。在曝光过程中,控制悬浮结构形成的要素主要有曝光模式、掩膜板至光刻胶之间的距离、曝光时间、掩膜板图案。在后续的处理过程中,显影时间和烘烤时间决定悬浮结构能否保留。通过对曝光和后续过程中各参数的控制,得到了一个可重复制备悬浮结构的制备体系。
关 键 词: 半导体技术;悬浮结构;光刻;碳微机电系统;衍射效应
Title: Simulation and fabrication of suspended C-MEMS structures based on the diffraction effects
Author: LONG Hu, LIU Dan, XI Shuang, XU Liangliang, TANG Zirong
Organization: School of Mechanical Science & Engineering, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology
Abstract: This paper proposes a fabrication system to create the suspended three-dimensional (3D) carbon-micro-electro-mechanical systems (C-MEMS) structures. By analysing the fabrication process of C-MEMS structures, we find that proper control of exposure condition such as the air gap between the photomask and photoresist and exposure time can help create suspended structures. We also find that the bake and development condition can consolidate or destroy suspended structure. We built an optical model based on diffraction effects by combining the exposure process and optical theory. The optical model which simulates the transmission of light in lithography can predict the intensity distribution on the surface of the SU-8 photoresist. Using this optical model we can not only explain how the suspended structures appear but also present some manufacturing methods. In exposure process, the key elements in exposure process include the exposure mode, the air gap between the photomask and photoresist, exposure time and the photomask pattern. In the experiment, we find that bake time and development time have a great impact on the suspended structures which can consolidate or destroy suspended structures. By combining the proper control of exposure condition in the guidance of optical theory and some manufacturing methods, we can repeatedly fabricate the suspended 3D C-MEMS structures. It is a kind of method which is from arc supposition to arc verification.
Key words: semiconductor technology; suspended structures; photolithography; carbon-micro-electro-mechanical systems; diffraction effect
发表期数: 2012年11月第22期
引用格式: 龙胡,刘丹,习爽,等. 基于衍射效应的C-MEMS悬浮结构的仿真和制备[J]. 中国科技论文在线精品论文,2012,5(22):2117-2123.
 
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