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Fabrication of Group IV Semiconductors on Insulator for Monolithic 3D Integration

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Fabrication of Group IV Semiconductors on Insulator for Monolithic 3D Integration Fabrication of Group IV Semiconductors on Insulator for Monolithic 3D Integration Ali Asadollahi Doctoral Thesis in Information and Communication Technology School of Electrical Engineering and Computer Science KTH Royal Institute of Technology Stockholm, Sweden 2017 KTH School of Electrical Engineering and Computer TRITA-EECS-AVL-2018:1 Science ISBN: 978-91-7729-658-4 SE-164 40 Stockholm SWEDEN Akademisk avhandling som med tillstånd av Kungliga Tekniska högskolan framlägges till offentlig granskning för avläggande av teknologie doktorsexamen fredagen den 16 februari 2018 klockan 10:00 i Ka-Sal C (Sal Sven-Olof Öhrvik), Electrum, Kungliga Tekniska högskolan, Kistagången 16, Kista. ©Ali Asadollahi, December 2017 Tryck: Universitetsservice US-AB, Stockholm, 2017 ii To My Parents “All the different nations in the world, despite their differences of appearance and language and the way of life, still have one thing in common, and that is what's inside in all of us. If we X-rayed the insides of different human beings, we wouldn't be able to tell from those X-rays what the person's language or background or race is.” Abbas Kiarostami iv Abstract The conventional 2D geometrical scaling of transistors is now facing many challenges in order to continue the performance enhancement while decreasing power consumption. The decrease in the device power consumption is related to the scaling of the power supply voltage (Vdd) and interconnects wiring length. In addition, monolithic three dimensional (M3D) integration in the form of vertically stacked devices, is a possible solution to increase the device density and reduce interconnect wiring length. Integrating strained germanium on insulator (sGeOI) pMOSFETs monolithically with strained silicon/silicon-germanium on insulator (sSOI/sSiGeOI) nMOSFETs can increase the device performance and packing density. Low temperature processing (<550 ºC) is essential as interconnects and strained layers limit the thermal budget in M3D. This thesis presents an experimental investigation of the low temperature (<450 ºC) fabrication of group IV semiconductor-on-insulator substrates with the focus on sGeOI and sSiGeOI fabrication processes compatible with M3D. To this aim, direct bonding was used to transfer the relaxed and strained semiconductor layers. The void formation dependencies of the oxide thickness, the surface treatment of the oxide and the post annealing time were fully examined. Low temperature SiGe epitaxy was investigated with the emphasis on the fabrication of Si0.5Ge0.5 strain-relaxed buffers (SRBs), etch-stop layer, and the device layer in the SiGeOI and GeOI process schemes. Ge epitaxial growth on Si as thick SRBs and thin device layers was investigated. Thick (500 nm-3 µm) and thin (<30 nm) relaxed GeOI substrates were fabricated. The latter was fabricated by continuous epitaxial growth of a 3-µm Ge (SRB)/Si0.5Ge0.5 (etch stop)/Ge (device layer) stack on Si. The fabricated long channel Ge pFETs from these GeOI substrates exhibit well-behaved IV characteristics with an effective mobility of 160 cm2/Vs. The planarization of SiO2 and SiGe SRBs for the fabrication of the strained GeOI and SiGeOI were accomplished by chemical mechanical polishing (CMP). Low temperature processes (<450 ºC) were developed for compressively strained GeOI layers (ɛ ~ -1.75 %, < 20 nm), which are used for high mobility and low power devices. For the first time, tensile strained Si0.5Ge0.5 (ɛ ~ 2.5 %, < 20 nm) films were successfully fabricated and transferred onto patterned substrates for 3D integration. Key Words: monolithic three dimensional (M3D) integration, strained germanium on insulator (sGeOI) pMOSFETs, silicon/silicon-germanium on insulator (sSOI/sSiGeOI) nMOSFETs, Si0.5Ge0.5 strain-relaxed buffer (SRB), direct bonding, chemical mechanical polishing (CMP), compressively strained GeOI, tensile strained Si0.5Ge0.5OI v Sammanfattning Den historiska skalningen av transistorer i två dimensioner står nu inför många utmaningar för att fortsättningsvis kunna förbättra prestandan och minska effektförbrukningen i integrerade kretsar. Effektförbrukningen beror på transistorstorlek, matningsspänning samt längden på metall ledningarna som förbinder transistorerna. Monolitisk 3-dimensionell (M3D) integration, där transitorer byggs vertikalt ovanpå varandra, är en möjlig lösning för att öka packningsdensiteten av transitorer och samtidigt reducera ledningslängden. Integration av töjt germanium på isolator (sGeOI) pMOSFET och med töjt kisel/kisel-germanium på isolator (sSOI/sSiGeOI) nMOSFET kan öka transistorernas prestanda och packningstätheten. Låg tillverknings temperatur (<550 ºC) är nödvändig på grund av att metalledare och töjda materialskikt finns på skivornas då transitorer tillverkas i M3D. Avhandlingen presenterar en experimentell undersökning av tekniker, med låg tillverkningstemperatur (<450 ºC), som är kompatibla med M3D för att erhålla halvledarmaterial i grupp IV på isolationssubstrat med fokus på sGeOI och sSiGeOI. För detta syfte användes direkt bondning för att överföra relaxerade och töjda halvledarskikt. Formering av håldefekters beroende av olika ytbehandlingar av oxiden, oxidtjockleken samt värmebehandlingen efter bondning undersöktes fullständigt. Låg temperatur SiGe epitaxi undersöktes med fokus på tillverkningen av relaxerade Si0.5Ge0.5 buffertar (SRB), ets-stopplager och komponentskiktet i processflödena för SiGeOI och GeOI. Epitaxiell tillväxt av Ge på Si med tjocka Ge SRB och tunna komponentlager undersöktes. Tjocka (500 nm - 3 µm) och tunna (<30 nm) relaxerade GeOI substrat tillverkades. Den senare tillverkades genom kontinuerlig epitaxiell tillväxt av 3 μm Ge (SRB)/Si0.5Ge 0.5 (etchstopp) /Ge (komponentskikt) på Si substrat. De tillverkade långkanals Ge pFETs från dessa GeOI-substrat uppvisar typiska IV egenskaper med en uppmätt mobilitet på 160 cm2/Vs. Planarisering av SiO2 och SiGe SRB för tillverkningen av töjt GeOI och SiGeOI undersöktes genom kemisk mekanisk polering (CMP). Lågtemperaturprocesser (<450 ºC) utvecklades för kompressivt töjda GeOI lager (ɛ ~ -1.75%, <20 nm), som kan användas för transistorer med hög mobilitet och låg effektförbrukning. För första gången tillverkades draguttöjda Si0.5Ge0.5 (ɛ ~ 2%, <20 nm) filmer framgångsrikt och överfördes på mönstrade substrat för 3D integration. vi Acknowledgements This PhD thesis is a summary of my research work during the past few years as a PhD student at KTH. During this period, I have received guidance, support and help from several people. I would first like to thank my main supervisor Prof. Mikael Östling for his great supervision, invaluable advice and inspiration as well as great support and help. I have learnt a lot from his amazing insight, attitude and managing approach in scientific research. Besides, I have learnt how to lead my way and to support my colleagues during the work. I will always remember how he trusted me in the first place and how encouraged me in the most difficult times. I would like to express my gratitude to my excellent co-supervisor Docent Per-Erik Hellström who was always ready to help me in my reserach and in my concerns. He has been a source of knowledge, inspiration and encouragement over these years. He is a wonderful teacher who is always ready to share his great knowledge in the best possible way, not just with his students, but with everyone. Special mention should be made of my colleagues during the past year. Ahmad Abedin, a great friend and colleague of mine with whom I have had a close and fruitful collaboration during all these years. I really enjoyed the hours we spent together in the cleanroom at KTH and out of work as a nice friend. We had many great discussions in order to tackle the problems and discovering new practical ways. I would like to thank Konstantinus (Kostas) Garidis, Ganesh Jayakumaar and Laura Zurauskaite other colleagues of mine, who were always ready to help me in my research and we had a great time together. Ganesh was a great office-mate, and I had a great time working with him in cleanroom and talking to him at the office. Kostas has always been a nice and cool friend, and I loved our scientific and artistic discussions. I am grateful to Prof. Mattias Hammar, Dr. Masoumeh (Azin) Ebrahimi, Mattias Ekström, Konstantinus Garidis, Hossein Elahipanah and Laura Zurauskaite for their constructive comments and careful proof reading of this thesis. I received great support and kind help from many people in the cleanroom, including: Dr. Gabriel Roupillard, Yong-Bin Wang, Dr, Christoph Hnekel, Dr. Thomas Zabel, Arman Sikiric, Dr. Mohammad Noroozi, Dr. Arash Salemi, Dr. Sam Vaziri, Christian Ridder, Cecilia Aronsson, Henry Radamson, Magnus Lindberg, AleksandarRadojocic, Per Wehlin, Stephan, Valentin Dubois and Stephan Schröder. Special thanks goes to Reza Nikpars my great friend, for his technical support as well as wonderful chats we had in cleanroom during the running time of the tools. He always made me happy with his amazing attitude and his talent in story-telling. vii Many thanks also goes to Dr. Mohsen Yakhshi Tafti, Dr. Mohammad (Adrin) Noroozi, Assoc. Prof. Masoud Daneshtalab, Dr. Sohrab Redjai Sani, BabakTaghavi, MiladGhadami, Dr. ShabnamMardani, Mehdi Moeen, Dr. Fatemeh (Mahtab) Sangghaleh, Dr. Roodabeh Afrasiabi, KeyRokh Moaatar, Ali Sobhravan and Farhad Shams for pleasant time, professional discussions, wonderful mingling with coffee chats, playing pingpong, doing climbing, having lunch, and many other sweet memories that we have had during past years. I also
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