Figure 2. Comparison of IRAV modes with corresponding IR and Raman vibrational modes of P3HT.

(a) Electroinduced reflectance (CMS) spectrum acquired in ambient air condition with V_on = −50 V, V_off = 25 V, and V_ds = 0 V, and averaged 100 times. (b) Photoinduced absorption (PIA) and (c) photoinduced reflectance (PIR) spectra measured at 78 K (λ_ex = 532 nm, I = 200 W/cm²). (d) Room temperature IR absorbance and (e) Raman (λ_ex = 532 nm) spectra. The main vibrational modes are indicated by dashed lines; the numbers on top of panel (a) refer to their labelling in Table 1.