Vertical AND-Type Flash TFT Array Capable of Accurate Vector-Matrix Multiplication Operations for Hardware Neural Networks

We propose a high-density vertical AND-type (V-AND) flash thin-film transistor (TFT) array enabling accurate vector-matrix multiplication (VMM) operations. Compared to the planar AND-type (P-AND) flash TFT array, the V-AND flash TFT array minimizes the parasitic line resistance (
$\times 1$
/87) due to its unique structure and reduced cell-to-cell distance. The trade-off between the voltage drop and the cell density depending on the number of floors of the V-AND flash TFT array is investigated. The V-AND flash TFT array exhibits superior VMM capability compared to the P-AND flash TFT array and improves classification accuracy (~30% higher) in hardware neural networks.