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Low-temperature titanium-based wafer...
~
Rensselaer Polytechnic Institute.
Low-temperature titanium-based wafer bonding.
紀錄類型:
書目-電子資源 : 單行本
正題名/作者:
Low-temperature titanium-based wafer bonding./
作者:
Yu, Jian.
面頁冊數:
164 p.
附註:
Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2767.
Contained By:
Dissertation Abstracts International67-05B.
標題:
Engineering, Electronics and Electrical. -
電子資源:
Download PDF (下載PDF全文)
ISBN:
9780542709579
Low-temperature titanium-based wafer bonding.
Yu, Jian.
Low-temperature titanium-based wafer bonding.
- 164 p.
Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2767.
Thesis (Ph.D.)--Rensselaer Polytechnic Institute, 2006.
This thesis presents novel methods of metal-based wafer bonding at back-end-of-the-line (BEOL) compatible conditions (≤450°C). For the first time to our knowledge, 200 mm diameter oxidized Si wafers are bonded with prime Si wafers using 10-300 nm thick Ti as bonding intermediate at 300-450°C. Nearly void-free bonding with strong mechanical integrity has been confirmed. Moreover, microcavity formation has been demonstrated by bonding of patterned wafers. Both Rutherford backscattering spectroscopy (RBS) and Auger electron spectroscopy (AES) show clear evidence of Si and Ti interdiffusion, whereas high-resolution transmission electron microscopy (HRTEM) reveals an approximately 8 nm thick amorphous layer at the bonding interface. Those results indicate that the strong adhesion at the Ti/Si bonding interface is attributed to a solid-state amorphization (SSA) assisted by interdiffusion.
ISBN: 9780542709579Subjects--Topical Terms:
170927
Engineering, Electronics and Electrical.
Low-temperature titanium-based wafer bonding.
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Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2767.
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Advisers: Ronald J. Gutmann; Jian-Qiang (James) Lu.
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This thesis presents novel methods of metal-based wafer bonding at back-end-of-the-line (BEOL) compatible conditions (≤450°C). For the first time to our knowledge, 200 mm diameter oxidized Si wafers are bonded with prime Si wafers using 10-300 nm thick Ti as bonding intermediate at 300-450°C. Nearly void-free bonding with strong mechanical integrity has been confirmed. Moreover, microcavity formation has been demonstrated by bonding of patterned wafers. Both Rutherford backscattering spectroscopy (RBS) and Auger electron spectroscopy (AES) show clear evidence of Si and Ti interdiffusion, whereas high-resolution transmission electron microscopy (HRTEM) reveals an approximately 8 nm thick amorphous layer at the bonding interface. Those results indicate that the strong adhesion at the Ti/Si bonding interface is attributed to a solid-state amorphization (SSA) assisted by interdiffusion.
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A key effort is devoted to fundamental investigation of low-temperature transition metal(TM)/Si-based wafer bonding. With the extensive work on Ti/Si system, additional experiments are performed with six other TM/Si systems, namely Ni/Si, Co/Si, Pd/Si, Hf/Si, Au/Si and Ta/Si. The results indicate there are two principal requirements for TM/Si-based wafer bonding: (1) intimate contact (able to break through kinetic barriers), and (2) adequate chemical bonding. Three kinetic barriers addressed in this thesis are: (1) enclosed microvoids due to surface roughness, (2) gas molecules at the bonding interface, and (3) interfacial oxides. Presence of these barriers can prevent formation of intimate contact, consequently retarding or even blocking interfacial interactions for chemical bonding. The unique properties of Group IVA metals (e.g., Ti and Hf) to reduce native SiO2 on Si surfaces and their exceptionally large solid solubility for O2 and N2, help overcome those issues.
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Once kinetic barriers are surmounted, the key for strong metal/Si-based wafer bonding is formation of chemical bonds, aided primarily by interdiffusion. According to their principal bonding mechanisms, the examined seven TM/Si-based wafer bonding can be divided into three groups: (1) silicidation bonding (Ni/Si, Co/Si and Pd/Si), (2) solid-state amorphization bonding (Ti/Si and Hf/Si), and (3) eutectic bonding (Au/Si). One of the major thesis contributions is the development and identification of a new type of metal-based wafer bonding, i.e. SSA bonding.
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Download PDF (下載PDF全文)
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