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We clarify the role of metal gates (e.g., TiN) on the degradation of the state-of-the-art buried-channel-array transistor (B-CAT) in dynamic random access memory (DRAM) chips. Unless the thermal budget during the processing step for integration is well controlled, residual stress caused by grain growth of the metal gate can result in a dynamic refresh failure of B-CAT through the negative shift in...
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