2018
DOI: 10.1021/acsaem.8b00012
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Effect of Replacing Alkyl Side Chains with Triethylene Glycols on Photovoltaic Properties of Easily Accessible Fluorene-Based Non-Fullerene Molecular Acceptors: Improve or Deteriorate?

Abstract: Hydrophilic oligo(ethylene glycol) (OEG) side chains are more flexible than alkyl chains and can facilitate the π−π stacking of conjugated polymer backbones, which has been proven to be a key structural feature leading to better device performance in polymer:fullerene blend polymer solar cells (PSCs). So far, little has been known about the influence of OEG side chains on the performance of non-fullerene acceptors in polymer:non-fullerene acceptor blends. Based on an easily accessible conjugated backbone of di… Show more

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Cited by 18 publications
(10 citation statements)
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“…Due to the strong positive mesomeric effect of the oxygen atom attached directly to the thiophene, an increase in the push‐pull effect can be expected, resulting in a higher rigidity of the conjugated backbone. Furthermore, in comparison with commonly used alkyl chains, glycol chains are more flexible and possess constant dipole; both factors can result in a shortening of the π‐π stacking distance between the polymer backbones . Another essential property is that the glycol chains have a high affinity for polar solvents and ions, allowing their penetration from the aqueous electrolyte into the polymer thin film, resulting in the possibility of mixed conduction of both electrical charges and ions in the solid state .…”
Section: Introductionmentioning
confidence: 99%
See 1 more Smart Citation
“…Due to the strong positive mesomeric effect of the oxygen atom attached directly to the thiophene, an increase in the push‐pull effect can be expected, resulting in a higher rigidity of the conjugated backbone. Furthermore, in comparison with commonly used alkyl chains, glycol chains are more flexible and possess constant dipole; both factors can result in a shortening of the π‐π stacking distance between the polymer backbones . Another essential property is that the glycol chains have a high affinity for polar solvents and ions, allowing their penetration from the aqueous electrolyte into the polymer thin film, resulting in the possibility of mixed conduction of both electrical charges and ions in the solid state .…”
Section: Introductionmentioning
confidence: 99%
“…Furthermore, in comparison with commonly used alkyl chains, glycol chains are more flexible and possess constant dipole; [37] both factors can result in a shortening of the π-π stacking distance between the polymer backbones. [38,39] Another essential property is that the glycol chains have a high affinity for polar solvents and ions, allowing their penetration from the aqueous electrolyte into the polymer thin film, resulting in the possibility of mixed conduction of both electrical charges and ions in the solid state. [40] Ion conduction is a crucial prerequisite for creating a functioning organic electrochemical transistor (OECT).…”
Section: Introductionmentioning
confidence: 99%
“…According to the present findings, we speculate that PTEG-1 is predicted to decrease the open-circuit voltage (V OC ), given the same blend, due to increased electrostatic-induced disorder of the interfacial energy levels. [57] Such a decrease in V OC was previously reported upon EG-functionalization of polymers [7] and nonfullerene acceptors, [58] and upon cyano-functionalization [59] of polymers, the latter being another way of introducing permanent dipole moments in organic semiconductors. [14] Broadening of charge carrier energy levels can also lead to lower mobilities.…”
Section: (6 Of 11)mentioning
confidence: 54%
“…[1][2][3] Electron-deficient groups, such as rhodanine (RH), 4,5 1,3-indandione (IN), 6,7 and 1,1-dicyanomethylene-3-indanone (CNIN) 8,9 have been widely used as acceptor units, together with fused-ring-based electron-rich groups, such as carbazole (Cz), 10,11 fluorene (Flu), 12,13 indacenodithiophene (IDT), 14,15 and indacenodithienothiophene (IDTT). Non-fullerene acceptors (NFAs) composed of donor (D) and acceptor (A) units have been widely reported due to their high power conversion efficiencies (PCEs) exceeding 14%.…”
Section: Introductionmentioning
confidence: 99%
“…They have several advantages, including their simple synthesis, strong and broad absorption in the UV–Vis region, and easily tunable energy levels . Electron‐deficient groups, such as rhodanine (RH), 1,3‐indandione (IN), and 1,1‐dicyanomethylene‐3‐indanone (CNIN) have been widely used as acceptor units, together with fused‐ring‐based electron‐rich groups, such as carbazole (Cz), fluorene (Flu), indacenodithiophene (IDT), and indacenodithienothiophene (IDTT) …”
Section: Introductionmentioning
confidence: 99%