標題: | Characterization and modeling of the metal diffusion from deep ultraviolet photoresist and silicon-based substrate |
作者: | Wang, TK Wang, MY Ko, FH Tseng, CL 奈米中心 Nano Facility Center |
關鍵字: | DUV photoresist;impurity diffusion;radioactive tracer technique;out-diffusion cleaning model;cleaning coefficient |
公開日期: | 1-May-2001 |
摘要: | The radioactive tracer technique was applied to investigate the out-diffusion of the transition metals (Cu, Fe and Co) from deep ultraviolet (DUV) photoresist into underlying substrate. Two important process parameters, viz., baking temperatures and substrate types (i.e., bare silicon, polysilicon, silicon oxide and silicon nitride), were evaluated. Results indicate that the out-diffusion of Co is insignificant, irrespective of the substrate type and baking temperature. The Out diffusion of Cu is significant for substrates of bare silicon and polysilicon but not for silicon oxide and nitride; for Fe, the story is reversed. The substrate type appears to strongly affect the diffusion, while the baking temperature does not. Also, the effect of solvent evaporation was found to play an important role in impurity diffusion. Using the method of numerical analysis, a diffusion profile was depicted in this work to describe the out-diffusion of metallic impurities from photoresist layer under Various baking conditions. In addition, the effectiveness of various wet-cleaning recipes in removing metallic impurities such as Cu, Fe and Co was also studied using the radioactive tracer technique. Among the six cleaning solutions studied, SC2 and SPM are the most effective in impurity removal. An out-diffusion cleaning model was first proposed to describe the cleaning process. A new cleaning coefficient, h(T), was suggested to explain the cleaning effect. The cleaning model could explain the tracer results. (C) 2001 Elsevier Science Ltd. All rights reserved. |
URI: | http://dx.doi.org/10.1016/S0969-8043(00)00334-1 http://hdl.handle.net/11536/29657 |
ISSN: | 0969-8043 |
DOI: | 10.1016/S0969-8043(00)00334-1 |
期刊: | APPLIED RADIATION AND ISOTOPES |
Volume: | 54 |
Issue: | 5 |
起始頁: | 811 |
結束頁: | 820 |
Appears in Collections: | Articles |
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