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30 July 2002 Complementary double-exposure technique (CODE): a way to print 80-nm gate level using a double-exposure binary mask approach
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To follow the accelerating ITRS roadmap, microprocessor and DRAM manufacturers have introduced the Alternating Phase shift mask (Alt.PSM) resolution enhancement technique (RET) in order to be able to print the gate level on sub 130nm devices. This is done at very high mask costs, a long cycle time and poor guarantee to get defect free masks. S. Nakao has proposed a new RET. He showed that sub 0.1um features could be printed with good process latitudes using a double binary mask printing technique. This solution is very interesting, but is applicable to isolated structures only. To overcome this limitation, we have developed an extension to this technique called CODE. This combines Nakao's technique and the use of assist features removed in a second subsequent exposure. This new solution enables us to print isolated as well as dense features on advanced devices using two binary masks. This paper will describe all the steps required to develop the CODE application. (1) Determination of the optimal optical settings, (2) Determination of optimal assist feature size and placement, (3) Layout rules generation, (4)Application of the layout rules to a complex layout, using the Mentor Graphics Calibre environment, (5) Experimental verification using a 193nm 0.63NA scanner.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Serdar Manakli, Yorick Trouiller, Olivier Toublan, Patrick Schiavone, Corinne Miramond, Yves Fabien Rody, Frank Sundermann, J. D. Chapon, and Pierre-Jerome Goirand "Complementary double-exposure technique (CODE): a way to print 80-nm gate level using a double-exposure binary mask approach", Proc. SPIE 4691, Optical Microlithography XV, (30 July 2002);

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