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Thin Films of Thiophene Copolymer / Phenylated Fullerene: Fluorescence Dynamics, Surface Topography and Chemical Composition
Author(s) -
Slusna Lenka Pribusova,
Szocs Vojtech,
Bondarev Dmitrij,
Haizer Ludovit,
Jerigova Monika,
Drzik Milan,
Repovsky Daniel,
Lorenc Dusan,
Velic Dusan
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.202002771
Subject(s) - thiophene , fullerene , materials science , fluorescence , acceptor , organic solar cell , polymer , thin film , absorption (acoustics) , relaxation (psychology) , photochemistry , analytical chemistry (journal) , chemical physics , nanotechnology , chemistry , optics , composite material , organic chemistry , psychology , social psychology , physics , condensed matter physics
System 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 τ 1 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.