Hacker News Reader

Paper on biological diodes https://arxiv.org/pdf/1706.00383.pdf but it doesn't use semiconductors, but ion transport (calls it iontronics instead of solid state electronics)

Indeed the ion channels used by nerves and muscles to send electrical signals are, like, one-way valves for ions

Do cable bacteria[0] count?

[0] https://en.m.wikipedia.org/wiki/Cable_bacteria

The cell membrane potential and voltage gated ion channels sound exactly like semiconductor to me…