{"title":"Invited talk: Promises and challenges in light-emitting diodes for lighting applications","authors":"E. Schubert","doi":"10.1109/WMED.2011.5767269","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767269","url":null,"abstract":"Lighting technologies based on semiconductor light-emitting diodes (LEDs) offer unprecedented promises that include three major benefits: (i) Gigantic energy savings enabled by efficient conversion of electrical energy to optical energy; (ii) Substantial positive contributions to sustainability through reduced emissions of global-warming gases, acid-rain gases, and toxic substances such as mercury; and (iii) The creation of new paradigms in lighting driven by the unique controllability of solid-state lighting sources. Due to the powerful nature of these benefits, the transition from conventional lighting sources to solid-state lighting is virtually assured. This presentation will illustrate the new world of lighting including the pervasive changes to be expected in lighting, displays, communications, and biotechnology. The presentation will also address the formidable challenges that must be addressed to further advance solid-state lighting technology. These challenges offer opportunities for research and innovation. Specific challenges include light management and carrier transport. As an example, we will discuss new optical thin-film materials with a tunable refractive index. We will also discuss the hotly debated efficiency droop, that is, the decreasing LED efficiency at high currents.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126707707","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":"A non-volatile memory array based on nano-ionic Conductive Bridge Memristors","authors":"S. Wald, Jake Baker, M. Mitkova, N. Rafla","doi":"10.1109/WMED.2011.5767279","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767279","url":null,"abstract":"Much excitement has been generated over the potential uses of chalcogenide glasses and other materials in circuits as “memristors” or as non-volatile memories. The memristor is a fourth passive two terminal electronic device, postulated by Leon Chua in 1971 and rediscovered in 2008. Our Conductive Bridge Memristor (CBM) changes its resistance in response to current passing through it by building up or dissolving a conductive molecular bridge in an otherwise insulating chalcogenide film. This paper outlines the design and simulation of a non-volatile memory using an array of CBM devices integrated with CMOS access transistors and read/write access circuitry. We have designed and simulated a large memory array layout using CBM devices accessed by an NMOS transistor and CMOS row/column read and write drivers. The design uses a folded-cascode op-amp configured to integrate current on the column as a strategy for sensing the device resistance. Each CBM device is connected to the array through a single minimum size NMOS transistor. The design has been simulated using a SPICE model for the PMC (Programmable Metallization Cell) [7]. We demonstrate the feasibility of accessing the device for read without exceeding the write threshold, and discuss the tradeoff of speed vs. array size associated with this technique. Plans are being developed to fabricate the design on a MOSIS multi project wafer with BEOL processing for the CBM devices.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117202860","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":"Adjustable supply voltages and refresh cycle for process variations and temperature changing adaptation in DRAM to minimize power consumption","authors":"L. Tran, F. Kurdahi, A. Eltawil","doi":"10.1109/WMED.2011.5767277","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767277","url":null,"abstract":"In this paper, we propose an approach to dynamically adjust supply voltages and refresh cycle in Dynamic Random Access Memory (DRAM). With this approach, we can save the chip power consumption with an awareness of process variations and temperature changing. While DRAM systems are generally designed for the worst case condition, they seldom operate under those scenarios. Thus, we can exploit the design slack when operating under more favorable conditions to save power. Simulations showed that it is possible to save power consumption by as much as 40%.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131128173","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":"All digital duty-cycle correction circuit design and its applications in high-performance DRAM","authors":"Feng Lin","doi":"10.1109/WMED.2011.5767278","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767278","url":null,"abstract":"Duty-cycle distortion (DCD) becomes a pressing concern as the data rate in high-performance DRAM interfaces exceeds multi-gigahertz range. In order to preserve or even improve the clock duty cycle on-die across process, voltage, and temperature (PVT) corners, a duty-cycle correction (DCC) circuit is generally desired. This paper investigates a variety of DCC circuits based on different implementations. Two applications using DCC circuits are presented in detail: 1) a digital DCC for high-speed data capture, and 2) an all-digital DCC for production DDR3 DRAMs. Pros and cons for the different approaches are compared based on the simulated and silicon data.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"775 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132661286","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":"Invited tutorial: Energy efficient multi-Gb/s I/O: Circuit and system design techniques","authors":"B. Casper","doi":"10.1109/WMED.2011.5767268","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767268","url":null,"abstract":"Chip-to-chip I/O data rates continue to scale aggressively to keep up with demands brought on by multi-core CPU-based computer and networking systems. Due to increasing bandwidth needs and declining system power budgets, dramatically improving I/O energy efficiency is crucial and is the major challenge currently facing the computer and networking industry. A multi-pronged approach to I/O power reduction will be presented, employing both circuit and interconnect optimization. The use of system level modeling and optimization to co-design the packaging, board interconnect, channel, transmitter, receiver, and clocking will be advocated with examples that demonstrate minimum-power I/O systems. I/O energy reduction depends on both active power minimization as well as the use of aggressive power management methods. Techniques and corresponding examples will be shown that demonstrate I/O power management including dynamic voltage and frequency scaling, low-power standby, and fast wake-up times. This session will provide insight into the challenges and opportunities associated with each low-power technique, using case studies to illustrate state-of-the-art low-power I/O systems.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"195 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113991051","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":"Invited tutorial: Advanced CMOS transistor technology: Past, present and future","authors":"S. Datta","doi":"10.1109/WMED.2011.5767289","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767289","url":null,"abstract":"Almost half a century later, Gordon Moore's accurate observation that the number of transistors in an integrated circuit doubles every two years continues to be the guiding principle of the semiconductor industry. We have almost taken for granted the apparent corollary; as transistor count increases, each transistor becomes smaller, faster and cheaper. Today, the transistor physical gate length in production is less than 30 nanometer; further brute-force geometric scaling of conventional silicon devices limit faces many fundamental challenges — rising energy consumption, power density and worsening device to device fluctuation being some of the foremost barriers. In this tutorial, I will present the amazing journey of the logic transistor in the last ten years starting with strained channel CMOS transistors, the high-k/metal-gate silicon CMOS transistors and the multiple-gate transistor architecture. Then, I will review the recent breakthroughs in non-silicon (compound semiconductor and germanium) based quantum-well transistor research that are promising transistor architecture for the next decade. I will also describe our research efforts in a new genre of “green” transistors that work on the quantum-mechanical band to band tunneling principle called Tunnel transistors and can operate with the record low energy delay product. Finally, interaction of emerging devices with the circuit and system architecture will also be discussed. This talk will summarize the twenty-first century logic transistor innovations that have and will continue to enhance the energy efficiency and performance of information processing systems through materials, device physics and architectural innovations.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121077224","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}
A. Abdelnaby, G. Potirniche, F. Barlow, A. Elshabini, R. Parker
{"title":"Finite element modeling of a back grinding process for Through Silicon Vias","authors":"A. Abdelnaby, G. Potirniche, F. Barlow, A. Elshabini, R. Parker","doi":"10.1109/WMED.2011.5767273","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767273","url":null,"abstract":"The optimization of grinding parameters for silicon wafers is necessary in order to maximize the reliability of electronic packages. This paper describes the work performed to simulate a back grinding process for Through Silicon Via (TSV) wafers using the commercial finite element code ABAQUS. The grinding of a TSV silicon wafer with a thickness of 120 μm mounted on a backing tape was simulated. The wafer was thinned to a thickness of 115.5 μm, by simulating the grinding with a diamond particle cutting through successive silicon and copper layers. The computed residual stresses induced in the wafer were compared with experimental values, and the plastic deformation in the simulated ground surface was compared with literature data and showed good correlation. The numerical model developed can be used to better understand the local grinding parameters in the TSV wafers and the effect of the of the copper vias on the wafer properties.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"150 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133919534","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}
Hajime Furusawa, S. Nogami, Takahisa Ogawa, Masanobu Kumazaki, Naoki Okada, H. Yamamoto
{"title":"High-performance transistor evaluation for low-cost embedded DRAM","authors":"Hajime Furusawa, S. Nogami, Takahisa Ogawa, Masanobu Kumazaki, Naoki Okada, H. Yamamoto","doi":"10.1109/WMED.2011.5767275","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767275","url":null,"abstract":"High-speed and low-power logic compatible performance is in high demanded for embedded DRAM (eDRAM) and/or custom DRAM applications. However, it is a challenge to make it cost-effectively using the commercial DRAM process. In this paper, the feasibility of high-performance transistors is demonstrated using the commercial Micron Technology 95nm DRAM process and design targeted for low-cost eDRAM. Multiple process conditions were optimized in the commercial DRAM process to simultaneously achieve the target performance and minimize DRAM retention time degradation. A dual-EPI process-thin selective EPI growth in the peripheral source/drain and thick selective EPI growth in the DRAM cell array-was experimentally developed to improve DRAM retention time. Parametrically, the dual-EPI process was successful, but further optimization is required for good yield.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"180 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116502236","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":"VT statistics on nanoscale NAND Flash arrays","authors":"A. Spessot, A. Calderoni, P. Fantini","doi":"10.1109/WMED.2011.5767274","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767274","url":null,"abstract":"This paper presents a compact model allowing the investigation of the variability effects in nanoscale NAND Flash arrays. The proposed model describes the NAND string current in the readout conditions, including parasitic capacitive couplings among neighboring cells, and also the cell programming and erase operations. Changing the model parameters to account for their physical fluctuation in a Monte Carlo fashion, the impact of each variability source on the statistical dispersion of the cell threshold-voltage is obtained for state-of-the-art and next generation technology nodes. Good agreement between simulations and experimental results and the low computational load make the proposed methodology a valid solution for the assessment of variability constraints on NAND technology design.","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124620016","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}
E. Stern, Aleksander Vacic, Nitin K. Rajan, D. Routenberg, J. Criscione, Jason Park, Monika Weber, T. Fahmy, M. Reed
{"title":"Invited talk: Label-free biosensing with silicon nanowires","authors":"E. Stern, Aleksander Vacic, Nitin K. Rajan, D. Routenberg, J. Criscione, Jason Park, Monika Weber, T. Fahmy, M. Reed","doi":"10.1109/WMED.2011.5767270","DOIUrl":"https://doi.org/10.1109/WMED.2011.5767270","url":null,"abstract":"Nanoscale electronic devices have the potential to achieve exquisite sensitivity as sensors for the direct detection of molecular interactions, thereby decreasing diagnostics costs and enabling previously impossible sensing in disparate field environments. Semiconducting nanowire-field effect transistors (NW-FETs) hold particular promise, though contemporary NW approaches are inadequate for realistic applications. We present here a number of top-down fabricated nanowire approaches [1] that are compatible with complementary metal-oxide-semiconductor (CMOS) technology that has not only achieved unprecedented sensitivity, but simultaneously facilitates system-scale integration of nanosensors. These approaches enable a wide range of label-free biochemical and macromolecule sensing applications, such as specific protein and complementary DNA recognition assays, and specific macromolecule interactions at <femtomolar concentrations. We will also discuss the physics of FET sensing, and device-related limits of potential detection [2]. A critical limitation of nanowire sensors is the Debye screening issue [3] which has to date prevented their use in clinical applications and physiologically relevant solutions. We will present an approach that solves this longstanding problem, and demonstrate the detection at clinically important concentrations of biomarkers from whole blood samples [4]. [1] Nature, 445, 519 (2007) [2] Elect. Dev. Lett. 31, 615 (2010) [3] Nano Lett. 7, 3405 (2007) [4] Nature Nanotech. 5, 138 (2010)","PeriodicalId":443024,"journal":{"name":"2011 IEEE Workshop on Microelectronics and Electron Devices","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121768915","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}