PffBT4T-2OD Based Solar Cells with Aryl-Substituted N-Methyl-Fulleropyrrolidine Acceptors
authors Gaspar, H; Figueira, F; Strutynski, K; Melle-Franco, M; Ivanou, D; Tome, JPC; Pereira, CM; Pereira, L; Mendes, A; Viana, JC; Bernardo, G
nationality International
journal MATERIALS
author keywords organic photovoltaics; fullerene derivatives; electron acceptors; fulleropyrrolidine acceptors; regioisomers of C-70 mono-adducts
keywords OPEN-CIRCUIT VOLTAGE; FULLERENE DERIVATIVES; ELECTRON-ACCEPTORS; PHOTOVOLTAIC CELLS; BIS-ADDUCTS; PERFORMANCE; MORPHOLOGY; PCBM; EFFICIENT; ENERGY
abstract Novel C-60 and C70N-methyl-fulleropyrrolidine derivatives, containing both electron withdrawing and electron donating substituent groups, were synthesized by the well-known Prato reaction. The corresponding highest occupied molecular orbital (HOMO)/lowest unoccupied molecular orbital (LUMO) energy levels were determined by cyclic voltammetry, from the onset oxidation and reduction potentials, respectively. Some of the novel fullerenes have higher LUMO levels than the standards PC61BM and PC71BM. When tested in PffBT4T-2OD based polymer solar cells, with the standard architecture ITO/PEDOT:PSS/Active-Layer/Ca/Al, these fullerenes do not bring about any efficiency improvements compared to the standard PC71BM system, however they show how the electronic nature of the different substituents strongly affects the efficiency of the corresponding organic photovoltaic (OPV) devices. The functionalization of C-70 yields a mixture of regioisomers and density functional theory (DFT) calculations show that these have systematically different electronic properties. This electronic inhomogeneity is likely responsible for the lower performance observed in devices containing C-70 derivatives. These results help to understand how new fullerene acceptors can affect the performance of OPV devices.
publisher MDPI
isbn 1996-1944
year published 2019
volume 12
issue 24
digital object identifier (doi) 10.3390/ma12244100
web of science category Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000507308200078
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journal analysis (jcr 2019):
journal impact factor 3.057
5 year journal impact factor 3.424
category normalized journal impact factor percentile 58.121
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