Multiple polymer memristors with homeostatic plasticity through ionic global gating

Organic neuromorphic hardware has attracted significant interest because it readily offers excellent biocompatibility and supports biomimetic ionic signaling. However, emulating a combination of Hebbian plasticity with positive feedback and homeostatic plasticity for brain-like ensemble stabilization remains challenging at the multi-device level. To address this, we developed an ionic gating strategy employing a lateral global gate. The global gating triggers ion redistribution, enabling synchronous adjustment of the memristive strength across multiple polymer memristors. A small network of these memristors exhibits homeostatic global regulation while preserving functional differences among individual synaptic weights. Moreover, the simulations of an L1-constrained neural network with mapping of the device data demonstrate that an appropriate global weight budget is essential for optimal learning performance, indicating the superiority of incorporating a homeostatic stabilization mechanism in neuromorphic circuits.