fig2

Figure 2. All light used was 2 s 15.17 mW·cm^–2. (A) ΔPSC responses and (B) the decay of the pristine device and that after the treatment of H₂S and subsequent H₂O₂; (C) Mechanism of diversified memory dynamics from the perspective of electron transfer. ΔPSC responses after the treatment of (D₁) H₂S and (D₂) H₂O₂ with different concentrations; Variations of τ and ΔPSC with the increased (E₁) H₂S and (E₂) H₂O₂ concentrations; Recyclability of (F) ΔPSC and (G) τ upon alternating H₂S and H₂O₂ treatments. ΔPSC: Postsynaptic current response; H₂S: hydrogen sulfide; H₂O₂: hydrogen peroxide; ITO: indium tin oxide; CB: conduction band; VB: valence band.