Large Storage Window in a-SiNx/nc-Si/a-SiNx Sandwiched Structure for Nanocrystalline Silicon Floating Gate Memory Application |
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Authors: | WANG Xiang HUANG Jian DING Hong-Lin ZHANG Xian-Gao YU Lin-Wei HUANG Xin-Fan LI Wei CHEN Kun-Ji |
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Institution: | National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093 |
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Abstract: | An a-SiNx/nanocrystalline silicon (nc-Si)/a-SiNx] sandwiched structure is fabricated in a plasma enhanced chemical vapour deposition (PECVD) system at low temperature (250°C). The nc-Si layer is fabricated from a hydrogen-diluted silane mixture gas by using a layer-by-layer deposition technique. Atom force microscopy measurement shows that the density of nc-Si is about 2×1011cm-2. By the pretreatment of plasma nitridation, low density of interface states and high-quality interface between the Si substrate and a-SiNx insulator layer are obtained. The density of interface state at the midgap is calculated to be 1×1010cm-2eV-1 from the quasistatic and high frequency C-V data. The charging and discharging property of nc-Si quantum dots is studied by capacitance-voltage (C-V) measurement at room temperature. Anultra-large hysteresis is observed in the C-V characteristics, which is attributed to storage of the electrons and holes into the nc-Si dots. The long-term charge-loss process is studied and ascribed to low density of interface states at SiNx/Si substrate. |
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Keywords: | 85 35 Be 73 20 Hb 73 63 Kv |
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