Combined theoretical and experimental studies of P3HT and PTB7 polymers for organic photodiodes

The polymer PTB7 is used in a fluorescence detection system for fabricating a bulk heterojunction (BHJ) organic photodiode as a photodetector. It is chosen and studied theoretically because of its suitable absorption bandwidth and electron donor efficiency when associated with PCBM in BHJ. However, in order to be sure of our theoretical prediction, we validated our method on the well-known P3HT. This is done by investigating experimentally and theoretically the UV-vis, Raman and photoluminescence (PL) spectra. As our experimental and theoretical results are in perfect agreement, we are confident on the photophysical properties of PTB7 predicted by our method.