Figure 3.

P3HT Photoexcitation Reduces CytC

(A) Absorbance spectra of oxidized and reduced CytC (light and dark green lines, respectively) and of P3HT solid film (red line). Polymer excitation is also represented by the blue-shaded rectangle.

(B) Absorbance variation of CytC before and after polymer CW photoexcitation for 3, 10, and 20 min. An external bias of −200 mV with respect to V_OC value is applied (see also Figure S6 for the sketch of the setup).

(C) Absorption variation of CytC before (time 0) and after P3HT CW photostimulation (20 min), as a function of the external bias. V_OC, ± 100 mV and ±200 mV potential values are applied during polymer excitation (see also Figure S5). The control measurement on a bare ITO electrode at −200 mV respect to V_OC is also reported, as a reference for direct photoreduction of CytC (dashed trace).

(D) Time variation of 550 nm absorption peak of CytC upon P3HT photoexcitation at V_OC (black solid line), V_OC– 100 mV (blue solid line), and V_OC– 200 mV (cyan solid line). See also Figure S7 for positive applied biases.