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1-T Capacitorless DRAM Using Laterally Bandgap Engineered Si-Si:C Heterostructure Bipolar I-MOS for Improved Sensing Margin and Retention Time

Author:
Lahgere, Avinash  Kumar, Mamidala Jagadesh  


Journal:
IEEE TRANSACTIONS ON NANOTECHNOLOGY


Issue Date:
2018


Abstract(summary):

In this paper, a single transistor (1-T) capacitorless DRAMusing laterally bandgap engineered Si-Si:C heterostructure bipolar I-MOS is investigated using 2-D calibrated simulations. The proposed device features a high-K gate dielectric, a metal gate, and an epitaxially grown Si0.99C0.01 source/drain regions. Due to lattice mismatch between the Si: C source/drain and the Si channel and resultant strain effect, the proposed 1-T capacitorless DRAM memory cell exhibits enhanced memory characteristics, particularly the sensing margin and the retention time. The proposed 1-T capacitorless DRAM exhibits a sensing margin of the order of similar to 1.5 mu A/mu m and similar to 2.0 mu A/mu m for the temperatures T =3D 300 K and T =3D 358 K, respectively. Also, the proposed 1-T capacitorless DRAM memory cell shows a retention time of similar to 1.68 s and similar to 845 ms for T =3D 300 K and T =3D 358 K, respectively. Therefore, the proposed 1-T capacitorless memory has a greater potential to replace existing 1-T capacitorless DRAM memory.


Page:
543---551


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