Understanding the role of non-fullerene acceptor crystallinity in the charge transport properties and performance of organic solar cells

Mondelli, Pierluigi; Kaienburg, Pascal; Silvestri, Francesco; Scatena, Rebecca; Welton, Claire; Grandjean, Martine; Lemaur, Vincent; Solano, Eduardo; Nyman, Mathias; Horton, Peter N.; Coles, Simon J.; Barrena, Esther; Riede, Moritz; Radaelli, Paolo; Beljonne, David; Reddy, G. N. Manjunatha; Morse, Graham

doi:10.1039/d3ta03284a

Cited by 7 publications

(1 citation statement)

References 99 publications

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“…38 An important feature characterizing m-4TICO and similar NFAs is that, when blended with donor polymers in bulk heterojunctions, the single crystal packing motif of the pure acceptor phase tends to be preserved. 39 As a result, it is justified to apply our computational analysis to the m-4TICO crystal structure, which provides a reasonable representation of the real thin-film morphology. 40 The molecular packing and crystal structure arrangement of m-4TICO molecules in the solid state is represented in Fig.…”

Section: Samuele Gianninimentioning

confidence: 99%

Dissecting the nature and dynamics of electronic excitations in a solid-state aggregate of a representative non-fullerene acceptor

Giannini,

Cerdá,

Prampolini

et al. 2024

J. Mater. Chem. C

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Section: Samuele Gianninimentioning

confidence: 99%

Dissecting the nature and dynamics of electronic excitations in a solid-state aggregate of a representative non-fullerene acceptor

Giannini,

Cerdá,

Prampolini

et al. 2024

J. Mater. Chem. C

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Boosting OECT Performance with PEGylated Gold Nanoparticles in Hydrophobic Channels

Ho,

Ditzer,

Solgi

et al. 2024

Adv Funct Materials

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Organic electrochemical transistors (OECTs) require organic mixed ion‐electron conductors (OMIECs) (i.e., hydrophilic materials supporting electron and ion transportation) as active materials. However, high‐performance OMIECs grafted with hydrophilic side chains are difficult to synthesize and purify, and often suffer from swelling during operation. In contrast, the synthetic pathways toward a broad range of hydrophobic polymeric semiconductors used in classic organic‐field‐effect transistors are well established, and several are even commercially available. Yet, these hydrophobic materials do not intrinsically support ionic transport, limiting their application in OECTs. Here, poly(ethyleneglycol) (PEG)‐coated gold nanoparticles (AuNP) are incorporated into conventional hydrophobic polymeric semiconductors like poly‐3‐hexylthiophene (P3HT), improving not only ionic but also electronic transport. The hydrophilic AuNPs modify P3HT crystallite orientation, shorten lamellar and π–π distances, and create pathways for ion penetration, as evidenced by GIWAXS and AFM studies. With 5 wt% AuNP loading, OECTs achieve µC* of 98 F cm−1 V−1 s−1, comparable to hydrophilic materials. The strategy also works for other polymer systems, offering a facile method to utilize hydrophobic materials in OECTs and boost their performance.

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Local Dipole Modulation Toward High Fill Factor in Organic Solar Cells

Chen,

Xiao,

Yao

et al. 2024

Advanced Materials

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Dipole moment arrangement in organic semiconductors plays a critical role in affecting the intermolecular packing, determining optoelectronic properties and device performance. Here, to get the desired fill factor (FF) values in organic solar cells (OSCs), the local dipole of non‐fullerene acceptors (NFAs) is modulated by changing the molecular asymmetries. Two NFAs, AA‐1 and AA‐2 are designed and synthesized, which have different substitutions of alkyl and alkoxyl groups. The unidirectional asymmetry in AA‐2 creates distinct local dipoles, while the bidirectional asymmetry in AA‐1 mitigates dipole variation. Despite the minimal impact on monomolecular properties, the local dipole moment significantly influences terminal group packing modes in the film state. This, in turn, enhances the relative dielectric constant, prolongs exciton lifetime, and reduces sub‐bandgap defect states. Consequently, PBDB‐TF:AA‐2‐based OSCs achieve an exceptional FF of 0.830 and a power conversion efficiency (PCE) of 18.3%, with a ternary device reaching a PCE of 19.3%. This work highlights the potential of dipole modulation in material design to get ideal FF values for high‐performance OSCs.

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Understanding the role of non-fullerene acceptor crystallinity in the charge transport properties and performance of organic solar cells

Abstract: The acceptor crystallinity has long been associated with favourable organic solar cells (OSCs) properties such as high mobility and Fill Factor. In particular, this applies to acceptor materials such as...

Cited by 7 publications

References 99 publications

Dissecting the nature and dynamics of electronic excitations in a solid-state aggregate of a representative non-fullerene acceptor

Dissecting the nature and dynamics of electronic excitations in a solid-state aggregate of a representative non-fullerene acceptor

Boosting OECT Performance with PEGylated Gold Nanoparticles in Hydrophobic Channels

Local Dipole Modulation Toward High Fill Factor in Organic Solar Cells

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