H. Fujiwara, Yuta Sato, N. Saito, Tomomasa Ueda, K. Ikeda
{"title":"Surrounding Gate Vertical-Channel FET with Gate Length of 40 nm Using BEOL Compatible High-Thermal-Tolerance In-Al-Zn Oxide Channel","authors":"H. Fujiwara, Yuta Sato, N. Saito, Tomomasa Ueda, K. Ikeda","doi":"10.1109/VLSITechnology18217.2020.9265109","DOIUrl":"https://doi.org/10.1109/VLSITechnology18217.2020.9265109","url":null,"abstract":"We have demonstrated, for the first time, a surrounding gate vertical-channel FET with gate length of 40 nm by introducing back-end-of-line (BEOL) process compatible novel oxide semiconductor (OS) In-Al-Zn-O as a channel material. Fabricated FETs exhibited high scalability by excellent thermal stability (~ 420°C) compared to conventional In-Ga-Zn-O-channel FETs, with high mobility (12.7 cm2/Vs) characteristics. Furthermore, the vertical-channel FET also exhibited excellent reliability and stable operation without floating body effect. Endurance of over 1011 cycles was also demonstrated. Our work opens a pathway to realization of high-performance BEOL transistor for 3D-LSI applications.","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"14 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78914230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Arimura, E. Capogreco, K. Wostyn, G. Eneman, L. Ragnarsson, S. Brus, S. Baudot, A. Peter, T. Schram, P. Favia, O. Richard, H. Bender, J. Mitard, N. Horiguchi
{"title":"Addressing Key Challenges for SiGe-pFin Technologies: Fin Integrity, Low-DIT Si-cap-free Gate Stack and Optimizing the Channel Strain","authors":"H. Arimura, E. Capogreco, K. Wostyn, G. Eneman, L. Ragnarsson, S. Brus, S. Baudot, A. Peter, T. Schram, P. Favia, O. Richard, H. Bender, J. Mitard, N. Horiguchi","doi":"10.1109/VLSITechnology18217.2020.9265035","DOIUrl":"https://doi.org/10.1109/VLSITechnology18217.2020.9265035","url":null,"abstract":"This paper shows the importance of oxygen control at the SiGe fin surface and within the gate stack. Optimized SiN liners are required to protect SiGe fins from oxidation during a flowable CVD (FCVD) densification anneal. Suppression of oxygen diffusion or scavenging from GeO via metal electrode is essential to achieve a low-D<inf>IT</inf> SiGe gate stack. By replacing HfO<inf>2</inf> with other dielectrics offering lower oxygen diffusivity, impact of metal electrode deposition process as well as the HfO<inf>2</inf> nitridation is corroborated to be related to the oxygen diffusivity. Finally, when using an embedded B-doped Si<inf>0.4</inf>Ge<inf>0.6</inf>S/D, higher channel strain in Si<inf>0.</inf><inf>7</inf>Ge<inf>0.3</inf> than in Si p-fins is obtained as predicted by TCAD.","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"2 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80277861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pierre-Yves Martinez, Y. Beilliard, M. Godard, D. Danovitch, D. Drouin, J. Charbonnier, P. Coudrain, A. Garnier, D. Lattard, P. Vivet, S. Chéramy, E. Guthmuller, C. F. Tortolero, V. Mengue, J. Durupt, A. Philippe, D. Dutoit
{"title":"ExaNoDe: combined integration of chiplets on active interposer with bare dice in a multi-chip-module for heterogeneous and scalable high performance compute nodes","authors":"Pierre-Yves Martinez, Y. Beilliard, M. Godard, D. Danovitch, D. Drouin, J. Charbonnier, P. Coudrain, A. Garnier, D. Lattard, P. Vivet, S. Chéramy, E. Guthmuller, C. F. Tortolero, V. Mengue, J. Durupt, A. Philippe, D. Dutoit","doi":"10.1109/VLSITechnology18217.2020.9265100","DOIUrl":"https://doi.org/10.1109/VLSITechnology18217.2020.9265100","url":null,"abstract":"In the context of high performance computing (HPC), energy efficiency and computing density are key for targeting exascale architectures. Close integration of chiplets, active interposer and field programmable gate arrays (FPGA) paves the way for dense, efficient and modular compute nodes. In this paper, we detail the ExaNoDe multi-chip-module (MCM) combining the integration of a substrate, an active interposer, some chiplets and bare dice. The reported MCM demonstrates that the multi-level integration flow enables tight integration of hardware accelerators in a heterogeneous HPC compute node.","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"44 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73887027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Ultra-low $p_{c}$ Extraction for Recessed and Non-Recessed Contacts: Generalized Transmission Line Model","authors":"Ying Wu, Haiwen Xu, Jishen Zhang, Chengkuan Wang, Zuopu Zhou, Haibo Wang, X. Gong, Y. Yeo","doi":"10.1109/vlsitechnology18217.2020.9265077","DOIUrl":"https://doi.org/10.1109/vlsitechnology18217.2020.9265077","url":null,"abstract":"A universal transmission line model (TLM) is developed to provide an accurate extraction of specific contact resistivity <tex>$rho_{c}$</tex> for both recessed and non-recessed contacts. This new model eliminates the need for the assumption that semiconductor sheet resistance under the contact <tex>$R_{shc}$</tex> is equal to that <tex>$mathrm{in}$</tex> the contact gap region <tex>$R_{sh}$</tex> which has been used for decades and expands the application of TLM-based methods for alloyed contacts for the first time. The model was verified experimentally by applying it to directly extract <tex>$rho_{c}, R_{shc}$</tex>, and metal sheet resistance <tex>$R_{m}$</tex> of alloyed p+-GeSn contact. The change of <tex>$R_{shc}$</tex> due to alloying or recess-etching is well captured and ultra-low <tex>$rho_{c}$</tex> values of <tex>$1.0times 10^{-9}Omega-mathrm{cm}^{2}$</tex> are extracted. In contrast, conventional TLM-based methods lead to a large variation <tex>$mathrm{in}rho_{c}$</tex> extraction and miscalculate <tex>$rho_{c}$</tex> by neglecting the deviation of <tex>$R_{shc}$</tex> from <tex>$R_{sh}$</tex>.","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"49 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85076863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
H. Oka, T. Matsukawa, K. Kato, S. Iizuka, W. Mizubayashi, K. Endo, T. Yasuda, T. Mori
{"title":"Toward Long-coherence-time Si Spin Qubit: The Origin of Low-frequency Noise in Cryo-CMOS","authors":"H. Oka, T. Matsukawa, K. Kato, S. Iizuka, W. Mizubayashi, K. Endo, T. Yasuda, T. Mori","doi":"10.1109/vlsitechnology18217.2020.9265013","DOIUrl":"https://doi.org/10.1109/vlsitechnology18217.2020.9265013","url":null,"abstract":"We have experimentally clarified the origin of low-frequency noise, which limits the coherence-time in Si quantum bit (qubit), utilizing cryo-CMOS. At cryogenic temperature (2.5 K), significantly enhanced $1/f$ noise is observed in Si MOSFETs, while it is not seen at room temperature. Interface trap density dependence of noise in Si MOSFETs, changing the surface orientation, revealed that the cryogenic $1/f$ noise is governed by carrier number fluctuation and we identified that the origin of the $1/fmathrm{noise}$ is interface trap at cryogenic temperature, for the first time. The present study demonstrates that the experiments using well-investigated MOSFETs can provide new knowledge on Si qubits, which it is hardly possible to investigate using Si qubit as itself.","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"55 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85084578","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Moroz, X. Lin, P. Asenov, D. Sherlekar, M. Choi, B. Cheng, S. Parikh, Po-Wen Chan, J. Lee
{"title":"Can We Ever Get to a 100 nm Tall Library? Power Rail Design for 1nm Technology Node","authors":"V. Moroz, X. Lin, P. Asenov, D. Sherlekar, M. Choi, B. Cheng, S. Parikh, Po-Wen Chan, J. Lee","doi":"10.1109/VLSITechnology18217.2020.9265022","DOIUrl":"https://doi.org/10.1109/VLSITechnology18217.2020.9265022","url":null,"abstract":"We explore six different PR (Power Rail) design options in the range of library cell heights from 100 nm to 130 nm for the 1nm design rules (i.e. CPP (Contacted Poly Pitch) of 40 nm and minimum MP (Metal Pitch) of 20 nm). All these design options include 4 tracks for signal routing but different width of the power rails, ranging from conventional power rail design to the power rails having larger thickness than the signal wires on the same metal layer; BPR (Buried Power Rails); and a combination of the conventional and buried power rails. Ru (ruthenium) and Mo (molybdenum) metals with subtractive process (i.e. deposit and etch instead of the damascene process) are considered for both the power rail and the signal routing. The six technology/design options are benchmarked based on PPA (Power-Performance-Area) analysis of a routed GPU (Graphics Processing Unit) logic block operated at HP (High Performance).","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"53 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85162164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiao Sun, Hesheng Lin, D. Velenis, J. Slabbekoorn, G. Talmelli, P. Bex, T. Sterken, R. Lauwereins, C. Adelmann, Andy Miller, G. van der Plas, E. Beyne
{"title":"3D Heterogeneous Package Integration of Air/Magnetic Core Inductor: 89%-Effi- ciency Buck Converter with Backside Power Delivery Network","authors":"Xiao Sun, Hesheng Lin, D. Velenis, J. Slabbekoorn, G. Talmelli, P. Bex, T. Sterken, R. Lauwereins, C. Adelmann, Andy Miller, G. van der Plas, E. Beyne","doi":"10.1109/VLSITechnology18217.2020.9265045","DOIUrl":"https://doi.org/10.1109/VLSITechnology18217.2020.9265045","url":null,"abstract":"We demonstrate a novel concept of integrating $110-mu mathrm{m}$. thick low-resistance high-Q magnetic core inductors in fan-out wafer level packaging (FOWLP). Unlike thin-film magnetic core inductors [1], this solution offers the possibility to embed thick cores to meet power density requirements, allowing for 89% efficiency at 1.2 W /mm2 power density for 2: 1 power conversion with a backside power delivery network (BSPDN) using circular-shaped magnetic inductors.","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"6 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87532589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Ali, K. Seidel, K. Kühnel, M. Rudolph, M. Czernohorsky, K. Mertens, R. Hoffmann, K. Zimmermann, U. Mühle, Johannes Müller, J. van Houdt, L. Eng
{"title":"A Novel Dual Ferroelectric Layer Based MFMFIS FeFET with Optimal Stack Tuning Toward Low Power and High-Speed NVM for Neuromorphic Applications","authors":"T. Ali, K. Seidel, K. Kühnel, M. Rudolph, M. Czernohorsky, K. Mertens, R. Hoffmann, K. Zimmermann, U. Mühle, Johannes Müller, J. van Houdt, L. Eng","doi":"10.1109/VLSITechnology18217.2020.9265111","DOIUrl":"https://doi.org/10.1109/VLSITechnology18217.2020.9265111","url":null,"abstract":"A Novel MFMFIS FeFET based on dual MFM/MFIS integration in a single gate stack is reported. The external top and bottom contacts, dual ferroelectric (FE) layers, and tailored MFM/MFIS area ratio $(mathrm{A}_{mathrm{FI}})$ shows flexible stack tuning for improved FeFET performance. A tradeoff between maximized MFM voltage and weaker FET channel inversion is notable in the ID(sat) as AFI decreases. A dual FE layer enables maximized MW and fine control of its size when MFM/MFIS switching contribution is tuned through AFI change. The merits of $mathrm{A}_{mathrm{FI}}$ tuning extends to low voltage switching with maximized MW size and extremely linear current change over a wide dynamic range at high symmetry of synaptic potentiation/depression. Reliability in terms of variability, temperature effects, endurance, and retention is reported. The MFMFIS concept is thoroughly discussed with insight on optimal stack tuning for improved FeFET characteristics.","PeriodicalId":6850,"journal":{"name":"2020 IEEE Symposium on VLSI Technology","volume":"13 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85450625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}