Abstract
Novel acceptor enhances the industrial readiness of solution based organic solar cells for low-cost electricity production.
Highlights
We present two approaches for simplifying O-IDTBR to improve the obtained i-FOM value
The planarity of the prepared molecules was investigated through density functional theory (DFT) as seen in Fig. 1B, A1 was calculated to be essentially planar whereas both A2 and A3 appears less planar due to their non-fused core, e.g., for A2, the non-fused half of the molecule has a steric twist disrupting planarity and conjugation
We present four novel small molecule non-fullerene acceptors with four different core-molecules (4,9-dihydro-4,4,9,9tetraoctyl-s-indaceno[1,2-b:5,6-b0]-dithiophene-dicarbaldehyde, 6-(5-formylthiophen-2-yl)-4,4-dioctyl-4H-indeno[1,2-b]thiophene2-carbaldehyde, 5,5,10,10-tetraoctyl-5,10-dihydrothieno[20,30:3,4]cyclopenta[1,2-g]thieno[3,2-c]isochromene-2,8-dicarbaldehyde and 5,50-(2,5-bis((2-ethylhexyl)oxy)-1,4-phenylene)bis(thiophene-2carbaldehyde)) flanked by 3-ethylrhodanine
Summary
We present two approaches for simplifying O-IDTBR to improve the obtained i-FOM value. Was omitted to a avoid large number of synthetic steps, thereby reducing the synthetic complexity, the electron donating core was substituted with less fused moieties to either adopt costeffective starting materials or reduce their synthetic complexity[24] even further and to evaluate the effect of a core degree of fusing. The molecules presented are 4,9-dihydro-4,4,9,9tetraoctyl-s-indaceno[1,2-b:5,6-b0]-dithiophene-dicarbaldehyde, 6-(5-formylthiophen-2-yl)-4,4-dioctyl-4H-indeno[1,2-b]thiophene2-carbaldehyde, 5,5,10,10-tetraoctyl-5,10-dihydrothieno[20,30:3,4]cyclopenta[1,2-g]thieno[3,2-c]isochromene-2,8-dicarbaldehyde and 5,50-(2,5-bis((2-ethylhexyl)oxy)-1,4-phenylene)bis(thiophene-2-carbaldehyde) flanked by 3-ethylrhodanine. The novel acceptors were initially characterized through NMR, MALDI-TOF, UV-Vis absorption and cyclic voltammetry. Their photovoltaic properties were firstly tested and optimized on small area spin-coated OSCs with P3HT as the donor polymer, after which the most promising material was transferred to large-area ITO-free slot-die coated OSCs
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