Extended Data Fig. 3: High temperature stability of index-free hardware.

a, transfer curves of sparsity and weight- FeFETs under 25 °C, 85 °C and 125 °C. b–c, 1000s retention of sparsity (b) and weight- FeFETs (c) can projected to 10 years. d-f, 128 states with sparsity- FeFETs on or off under 25 °C (d), 85 °C (e) and 125 °C (f). g-i, output curves of potentiation process with sparsity- FeFETs on under 25 °C (g), 85 °C (h) and 125 °C (i).