Excimer-laser crystallized poly-Si TFTs with mobility of more than 600 cm/sup 2//Vs

Choi, Du Young; Sadayuki, Eiichi; Sugiura, Osamu; Matsumura, Masakiyo

doi:10.1109/16.239809

Cited by 4 publications

(2 citation statements)

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“…Besides being a high-quality gate insulator, high field-effect mobility also significantly influences device performance. The excimer laser annealing (ELA) method has been widely used to obtained high field effect mobility of low temperature polycrystalline TFTs [11]. However, large off-state leakage current, poor poly-Si uniformity, and poor electrical stability of ELA poly-Si TFTs due to trap states in poly-Si grain boundaries and at the SiO /poly-Si interface are still serious problems.…”

Section: Introductionmentioning

confidence: 99%

High-Performance RSD Poly-Si TFTs With a New ONO Gate Dielectric

Chang

Yang

Hung

2004

IEEE Trans. Electron Devices

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This paper developed a novel polycrystalline silicon (poly-Si) thin-film transistor (TFT) structure with the following special features: 1) a new oxide-nitride-oxynitride (ONO) multilayer gate dielectric to reduce leakage current, improved breakdown characteristics, and enhanced reliability; and 2) raised source/drain (RSD) structure to reduce series resistance. These features were used to fabricate high-performance RSD-TFTs with ONO gate dielectric. The ONO gate dielectric on poly-Si films shows a very high breakdown field of 9.4 MV/cm, a longer time dependent dielectric breakdown, larger BD , and a lower charge-trapping rate than single-layer plasma-enhanced chemical vapor deposition tetraethooxysilane oxide or nitride. The fabricated RSD-TFTs with ONO gate dielectric exhibited excellent transfer characteristics, high field-effect mobility of 320 cm 2 V s, and an on/off current ratio exceeding 10 8 . Index Terms-Gate dielectric, N 2 O-plasma oxynitride, oxide-nitride-oxide (ONO), raised source/drain (RSD), thin-film transistors (TFTs).

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Section: Introductionmentioning

confidence: 99%

High-Performance RSD Poly-Si TFTs With a New ONO Gate Dielectric

Chang

Yang

Hung

2004

IEEE Trans. Electron Devices

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“…1 It has been reported that high field-effect mobility LTPS TFTs were obtained by excimer laser annealing ͑ELA͒. 2 However, traditional LTPS TFTs use single-layer plasmaenhanced chemical vapor deposition ͑PECVD͒ SiO 2 or Si 3 N 4 as the gate insulator and so suffer from high interface trap density, low breakdown strength, and high gate leakage current. 3,4 In 1984, Watanabe et al first reported silicon oxide-nitride-oxide ͑ONO͒ films as alternative dielectrics for dynamic random access memory ͑DRAM͒ cell capacitors.…”

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confidence: 99%

Low-Temperature Poly-Si Thin-Film Transistor with a N[sub 2]O-Plasma ONO Multilayer Gate Dielectric

Chang

Yang

Hung

2004

Electrochem. Solid-State Lett.

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High-performance polycrystalline silicon ͑poly-Si͒ thin-film transistors ͑TFTs͒ with oxide/nitride/oxynitride ͑ONO͒ multilayer gate dielectrics were fabricated. The low-temperature ͑Ϲ300°C͒ ONO multilayer dielectric uses three stacked layers: the bottom layer is a very thin N 2 O-plasma oxynitride deposited by plasma-enhanced chemical vapor deposition ͑PECVD͒, the middle layer is PECVD Si 3 N 4 , and the top layer is tetraethoxysilane ͑TEOS͒ oxide. The ONO gate dielectric on poly-Si films shows a very high breakdown field of 9.4 MV/cm, a longer time-dependent dielectric breakdown lifetime and a lower charge trapping rate than single-layer PECVD TEOS oxide or nitride. The fabricated poly-Si TFTs with ONO gate dielectric exhibited excellent transfer characteristics, high field-effect mobility of 213 cm 2 /V s, and an ON/OFF current ratio of over 10 8 .In the realization of large-area active matrix liquid crystal displays ͑AMLCDs͒ with embedded peripheral poly-Si thin-film transistor ͑TFT͒ drive circuits on the panel, field-effect mobility and gate insulator quality are two of the most important determinants of the performance and reliability of low-temperature polycrystalline silicon ͑LTPS͒ TFTs. 1 It has been reported that high field-effect mobility LTPS TFTs were obtained by excimer laser annealing ͑ELA͒. 2 However, traditional LTPS TFTs use single-layer plasmaenhanced chemical vapor deposition ͑PECVD͒ SiO 2 or Si 3 N 4 as the gate insulator and so suffer from high interface trap density, low breakdown strength, and high gate leakage current. 3,4 In 1984, Watanabe et al. first reported silicon oxide-nitride-oxide ͑ONO͒ films as alternative dielectrics for dynamic random access memory ͑DRAM͒ cell capacitors. 5 In 1995, Yang et al. used ONO film as a gate insulator in high temperature TFTs. 6 In ONO multilayer structures, the bottom oxide provides a device-quality electrical SiO 2 /Si interface. The nitride layer increases the effective dielectric constant of the ONO sandwich in such a way that a film twice as thick as SiO 2 -based dielectric shows equal capacitance, and therefore decreased threshold voltage, decreased subthreshold swing, and increased drive current of the poly-Si TFTs. Finally, the top oxide provides the electrical contact to the poly-Si gate electrode. 7 Although ONO structures exploit the advantages of oxide and nitride films concomitantly, ONO films are prepared by thermal growth in a low-pressure ͑LP͒CVD reactor at high temperature ͑Ͼ750°C͒; this method is not appropriate for fabricating LTPS TFTs at a temperature much higher than a strain point of the glass substrate.This paper presents a low temperature ͑Ϲ300°C͒ PECVD oxide/ nitride/N 2 O-plasma oxynitride ͑ONO͒ multilayer gate dielectric. PECVD SiO 2 /Si 3 N 4 stack dielectric has lower leakage current and much longer ͑by two to three orders of magnitude͒ time-dependent dielectric breakdown ͑TDDB͒ lifetime than single-layer PECVD tetraethoxysilane ͑TEOS͒ oxide or Si 3 N 4 dielectrics. 8 Furthermore, N 2 O-plasma oxide has been reported to h...

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Optimization of crystallization energy density for excimer laser annealed polycrystalline silicon thin film transistors

Zhang

Wang

et al. 2016

2016 13th IEEE International Conference on Solid-State and Integrated Circuit Technology (ICSICT)

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Excimer-laser crystallized poly-Si TFTs with mobility of more than 600 cm/sup 2//Vs

Cited by 4 publications

References 0 publications

High-Performance RSD Poly-Si TFTs With a New ONO Gate Dielectric

High-Performance RSD Poly-Si TFTs With a New ONO Gate Dielectric

Low-Temperature Poly-Si Thin-Film Transistor with a N[sub 2]O-Plasma ONO Multilayer Gate Dielectric

Optimization of crystallization energy density for excimer laser annealed polycrystalline silicon thin film transistors

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