{"title":"Monitoring of heavy metals in as-implanted SIMOX with surface photovoltage","authors":"L. Jastrzebski, R. Soydan","doi":"10.1109/SOI.1988.95402","DOIUrl":"https://doi.org/10.1109/SOI.1988.95402","url":null,"abstract":"Summary form only given. Surface photovoltage (SPV) was used successfully to measure the iron concentration in as-implanted SIMOX (separation by implanted oxygen) materials. An initial correlation has been established between diffusion lengths measured on the back of SIMOX wafers and Fe concentration measured by SIMS (secondary ion mass spectrometry) and spark source in as-implanted SIMOX films. The SPV measurements are quick, nondestructive, and do not require any additional sample preparation. Therefore, they could be used easily as a quality control method to monitor heavy metals in as-implanted SIMOX layers.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114586191","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":"Low defect, high quality SIMOX material for bipolar device applications","authors":"F. Namavar, E. Cortesi, P. Sioshansi","doi":"10.1109/SOI.1988.95395","DOIUrl":"https://doi.org/10.1109/SOI.1988.95395","url":null,"abstract":"The threading dislocation densities of 10/sup 8//cm/sup 2/ to 10/sup 10//cm/sup 2/ that are typical of SIMOX material are detrimental for bipolar structures and orders-of-magnitude reduction of defect density is still required to permit SIMOX (separation by implanted oxygen) material to be acceptable for high-performance bipolar and analog devices. Two methods have been developed to produce low-defect SIMOX wafers. In the first method, threading dislocation defects are reduced by low-dose Ge implantation and subsequent solid-phase epitaxial (SPE) regrowth. Ge implantation produces a strained and amorphized layer that during the subsequent SPE acts as an artificial interface and deflects or stops the propagation of threading dislocations. In the second method, threading dislocations are prevented by a multiple low-dose implantation and high-temperature annealing process. No defects were observed for implantation with doses up to 8*10/sup 17/ O/sup +//cm/sup 2/, and threading dislocation density has been reduced by three to four orders of magnitude. Continuous and uniform buried layers are formed with about 65% of the dose required by the standard SIMOX process. Preliminary results have shown that by use of these methods low defect, superior quality, SIMOX wafers for submicron CMOS and bipolar device applications can be produced.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116064077","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":"Numerical analysis of island-edge effects in SOS MOSFETs","authors":"Q. Lu, Changtong Huang","doi":"10.1109/SOI.1988.95405","DOIUrl":"https://doi.org/10.1109/SOI.1988.95405","url":null,"abstract":"Degradation of electric characteristics of SOS MOSFETs occurs due to a parasitic transistor in the islands edge. When SOS devices are fabricated with a wet etch process, the island-edge effects are caused by high interface-state densities in the","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"473 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123033072","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 VHSIC compatible CMOS/SOS cell family","authors":"M. J. Fresnadillo Martínez, R. W. Polkinghorn","doi":"10.1109/SOI.1988.95441","DOIUrl":"https://doi.org/10.1109/SOI.1988.95441","url":null,"abstract":"Summary form only given, as follows. The authors report on a family of standard cells and macro/compilers designed into a VHSIC-compatible, radiation-hard CMOS/SOS (silicon-on-sapphire) process. The family currently consists of one hundred standard cells and five macro/compilers. Standard cells include basic gate and flip-flop functions. The macro/compilers are available for RAMs, ROMs, multipliers, register files, and barrel shifters. A front-end design library is available for these functions on Daisy workstations to permit schematic capture, logic simulation, timing analysis, and netlist generation. Automatic placement and route is accomplished using VLSI Technology Inc. software on Apollo workstations. Compiled functions use VLSI technology compiler software. Back annotation to the Daisy permits resimulation using exact routing capacitances.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"160 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132825201","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":"Enhanced elimination of extended defects associated with P/sup +/ and Ga/sup +/ implantation of SIMOX","authors":"K. Jones, D. Venables, C. R. Horne, G. Davis","doi":"10.1109/SOI.1988.95422","DOIUrl":"https://doi.org/10.1109/SOI.1988.95422","url":null,"abstract":"Summary form only given. Ion implantation doping of annealed SIMOX (separation by implantation of oxygen) wafers has been investigated. The dose of the phosphorus and gallium implants, 1*10/sup 16//cm/sup 2/ and 5*10/sup 14//cm/sup 2/, respectively, was such that the peak concentration exceeded the impurity solid solubility at the subsequent annealing temperature of 900 degrees C. The energy was adjusted so that the top 700 AA of the 1300 AA superficial silicon layer was amorphized. Both plan-view and cross-sectional TEM were used to investigate the subsequent defect annealing kinetics. No category III (regrowth related) defects were observed upon low-temperature (550 degrees C) solid phase epitaxy. Diffuse dark field TEM results indicate that a fine dispersion of oxide particles exists in the superficial silicon layer. Upon 900 degrees C annealing, enhanced elimination of the category II (end of range) dislocation loops was observed in both the SIMOX and silicon control wafers. This indicates that the high oxygen concentration in the superficial silicon layer does not retard the enhanced defect dissolution process. However, Hall effect and sheet resistivity results indicate that there is a significant decrease in the free carrier mobility as well as the electrical activation of these dopants in SIMOX.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134562323","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 performance comparison of advanced SOI technologies","authors":"D. Adams, M. Austin, R. Rai-Choudhury, J. Hwang","doi":"10.1109/SOI.1988.95448","DOIUrl":"https://doi.org/10.1109/SOI.1988.95448","url":null,"abstract":"Summary form only given. Devices have been fabricated using conventional SOS, rapid thermal anneal (RTA) SOS, solid-phase epitaxy and regrowth (SPEAR) SOS, RTA-SPEAR SOS, separation by implantation of oxygen (SIMOX), RTA-SIMOX, and zone-melt recrystallization (ZMR) wafers. The process sequence used was a double-level-metal 1.25- mu m CMOS/SOS process. A comprehensive test vehicle featuring 16 K and 64 K SRAMs was used to allow both parametric and functional characterization. For 0.3- mu m silicon film thickness on SOS, SPEAR processing resulted in a 30% improvement in carrier mobilities and a 10-20% improvement in device saturation currents over conventional SOS. No significant leakage improvement was observed. RTA processing at 1390 degrees C has shown potential for performance enhancement on SOS. Mobility improvements of 10-20% have been demonstrated, while drain leakage was unchanged. Preliminary SIMOX results have indicated improvements of 50% for electron mobilities, with hole mobilities unchanged over conventional SOS. Drain leakage was two orders of magnitude lower. Characterization results have also been obtained for ZMR, RTA-SPEAR SOS, improved SPEAR-SOS, and improved SIMOX wafers.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126031531","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}
L. Chung, L. Tocci, P. Liu, J. Fraser, J. White, R. Colesworthy, J. Brandewie, R. Kjar
{"title":"Radiation hardened VHSIC CMOS/SOS process","authors":"L. Chung, L. Tocci, P. Liu, J. Fraser, J. White, R. Colesworthy, J. Brandewie, R. Kjar","doi":"10.1109/SOI.1988.95451","DOIUrl":"https://doi.org/10.1109/SOI.1988.95451","url":null,"abstract":"Summary form only given, as follows. A vertical wall mesa process has been used to fabricate radiation-hard CMOS/SOS circuits for military applications. However, scaling of this process to smaller geometry has to include not only lateral dimensions but also vertical dimensions. For 1.6- mu m design rules, a radiation-hard process has been developed with 1.25- mu m effective channel lengths and 250-AA gate oxide. Two asynchronous 16 K SRAMs with 2.0- mu m and 1.6- mu m design rules, respectively, were used as test vehicles along with an extensive design rules verification module and a radiation test module. A defect monitor structure was also incorporated for process monitoring, failure analysis, and yield prediction. Gate oxide reliability was greatly improved by treating the edges of vertical islands using a modified isolation oxidation technique. Threshold voltage shifts as low as -0.3 V and -0.5 V at 1 Mrad (SiO/sub 2/) total dose for nFETs and pFETs, respectively, were achieved. A low radiation-induced edge leakage of 15 nA/edge, primarily due to thin gate oxide, was also achieved. 16 K SRAM functionality beyond 1 Mrad total dose was demonstrated.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133880919","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. Elewa, F. Balestra, S. Cristoloveanu, A. Auberton-Herve, J. Davis
{"title":"Performance of SIMOX transistors at very low temperatures","authors":"T. Elewa, F. Balestra, S. Cristoloveanu, A. Auberton-Herve, J. Davis","doi":"10.1109/SOI.1988.95446","DOIUrl":"https://doi.org/10.1109/SOI.1988.95446","url":null,"abstract":"Summary form only given. The authors describe a systematic investigation of SIMOX (separation by implantation of oxygen) MOSFET properties from ambient down to liquid helium temperature. Comparisons are made between n- and p-channel enhancement and depletion-mode MOSFETs fabricated on SIMOX annealed at high (HTA: 1300 degrees C) and low (LTA: 1200 degrees C) temperatures. The behavior of front and back channels in both edgeless and conventional structures is also pointed out.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132720316","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":"Comparison of fabrication methods for bonded wafer SOI","authors":"J. Delgado, G. Rouse, C. McLachlan, S. Gaul","doi":"10.1109/SOI.1988.95430","DOIUrl":"https://doi.org/10.1109/SOI.1988.95430","url":null,"abstract":"Summary form only given. The reduction of collector series resistance in bipolar devices and the prevention of back-gate effects in MOS devices is commonly realized through the use of highly doped buried layers and retrograde implanted wells, respectively. For device applications requiring a thick SOI layer (approximately 10 mu m), this can be achieved by using back-side processing in a wafer-bounding technique. While bipolar devices have been successfully fabricated using this method, the resulting back-side nonuniformities can reduce bounding yield. This shows up as microdebonding after the trench etch used for lateral isolation. Other drawbacks to back-side bonding are difficult front-to-back alignment and a relatively large variation in layer thickness (+1.5 mu m across a 4-in. slice) due to the grind/polish step used for planarization. An improved method of manufacturing thick bonded SOI material using an epitaxial layer on a thin bonded substrate eliminates many of the drawbacks to the back-side bonding approach. This epi-on-bonded method results in an all-frontside material process suitable for use in a complementary bipolar or BICMOS technology.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"9 14","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132846760","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":"Selected area channeling pattern, defect etch and lifetime study of silicon implanted with oxygen","authors":"P. Roitman, G. Davis, P. Nelson, O. Stafsudd","doi":"10.1109/SOI.1988.95434","DOIUrl":"https://doi.org/10.1109/SOI.1988.95434","url":null,"abstract":"Electron channeling pattern analysis and etch pit counting have been used to study defects in SIMOX (separation by implantation of oxygen) materials. Data have also been obtained on photoconductive lifetime, which is an indirect measure of defect density. The samples were implanted with oxygen at 150 keV to a dose of 1.7*10/sup 18/ cm/sup -2/ at temperatures of 505 to 535 degrees C. They were all annealed at 1250 degrees C in N/sub 2/+1%O/sub 2/ and etched using the Wright etch formulation. The diameters of the etch pits ranged from 50 to 100 nm. The lifetimes in the microsecond range were measured using pulsed 20-ns excitation at 308 nm from an Xe-Cl excimer laser. A linear relation is observed between with width of the lines in the electron channeling pattern and the log of the dislocation density, as expected from diffraction density, as expected from diffraction theory.<<ETX>>","PeriodicalId":391934,"journal":{"name":"Proceedings. SOS/SOI Technology Workshop","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131834568","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}