Add time:08/24/2019         Source:sciencedirect.com

Two-dimensional Raman spectroscopy has been applied to provide the information on charge carriers and thermal stability of a doped poly(3-chlorothiophene) (PCTh) film. The strong spectral intensity at 1420 cm−1 shows that positive polarons are the major charge carriers in doped PCTh. On the other hand, peaks in the 2D contour maps separate the overlapped bands around 1386 cm−1, confirming the existence of positive bipolarons in PCTh. The positive asynchronous cross peak located at 1420/1386 cm−1 further indicates that bipolarons have a higher thermal stability compared with polarons in the doped PCTh. The increase of the spectral intensity at 1454 cm−1 and the decrease of the spectral intensity at 1420 cm−1 indicate that during the heating process, a structural change occurs in the PCTh film.

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