Abstract
AbstractSystem of thiophene‐based polymer (P33) donor and fullerene acceptor is studied for prospective applications in organic photovoltaics. The films of P33 and P33/PCBM are characterized by absorption, steady‐state and time‐resolved fluorescence, AFM, CV and SIMS. PCBM quenches fluorescence of the blend and results in blue shift from 524 nm to 505 nm, indicating the charge transfer. The global ultrafast fluorescence decay times τ1 for P33 and P33/PCBM are 8.9 ps and 3.8 ps, respectively, describing self‐trapped exciton relaxation. The topography of P33 and P33/PCBM was studied by AFM and fluorescence dynamics is correlated with surface topography. Scans of P33/PCBM with average roughness of 5.3 nm reveal flatter surface than P33. These results suggest that the flatter surface and also proposed flatter internal structure in more organized nano‐domains promote the faster fluorescence dynamics. The study of P33/PCBM blend film provides correlation between the dynamics and the structure.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
