Fig. 3: Experimental validation.
From: Bistable organic electrochemical transistors: enthalpy vs. entropy
a, b Bistability decreases with a rising entropy and b falling enthalpy (\({H}_{{{{{\rm{tr}}}}}}\) high: untreated device, \({H}_{{{{{\rm{tr}}}}}}\) low: device with added KCl), in line with the expectations from Fig. 2a (VDS = −0.1 V). c Chemical potential profiles are normalized with symmetry around (ψ, μ(ψ)) = (0.5, 0 eV) and partial integrals of equal size. The analytic continuation was performed to account for the asymmetry of the on- and off-state (light blue data points). The fit corresponds to the chemical potential derived from the fitted Gibbs free energy. d, e Reconstructing and fitting G(ψ) reveals decreasing local maxima for both experiments of a and b, with the extracted interaction parameters summarized in f. g Thermal imaging reveals the in- and outflow of heat during device operation, affirming the conclusion from Fig. 2b. h The non-monotonic progression of the subthreshold swing with temperature confirms the hypothesis of Fig. 2c. Further, the subthreshold swing decreases for reduced enthalpy as suspected.
