Triplet Tellurophene‐Based Acceptors for Organic Solar Cells

Yang, Lei; Gu, Wenxing; Lv, Lei; Chen, Yu‐Sheng; Yang, Yufei; Ye, Pan; Wu, Jianfei; Lei, Hong; Peng, Aidong; Huang, Hui

doi:10.1002/ange.201712011

Cited by 41 publications

(30 citation statements)

References 59 publications

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“…To tackle this issue, non‐fullerene acceptors (NFAs) with tunable energy and various structure have emerged and achieved rapid progress . Figure summarized the obtained PCE under varied V OC values (Figure a) and the relationship between V OC and E loss (Figure b), where over fifty reported OSCs are involved, related references have been listed in Supporting Information.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

et al. 2019

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Summary of main observation and conclusion One of the most important challenges that hinders the power conversion efficiencies (PCEs) of organic solar cells (OSCs) is the modest open‐circuit voltages (VOC) due to large energy losses. The large driving force during for charge generation and the non‐radiative recombination are the main causes of energy losses. To maximize the VOC of OSCs, herein, we modulate the end‐groups and design a non‐fullerene acceptor ITCCM‐O, which shows a bandgap of 2.0 eV. By blending a polymer donor named J52, the device demonstrates a PCE of 5.5% with an outstanding VOC of 1.34 V, which is the highest value for single‐junction OSCs over 5% PCEs. The high VOC is benefited from 1) the negligible driving force for charge transfer, and 2) the suppressed non‐radiative recombination loss, as low as 0.22 V.

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Section: Background and Originality Contentmentioning

confidence: 99%

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

et al. 2019

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“…[9][10][11] Therefore, nonfullerene acceptor (NFA) materials (asymmetric or symmetric) are emerging as promising candidates to replace the traditional fullerene derivatives thereby leading to the significantly boosted PCE from around 6% in 2015 to over 18% currently. [12][13][14][15][16][17][18][19][20] The synthetic procedures for M14, M17, M18, and M19 are depicted in Scheme 1, and the details are provided in the Supporting Information. M14 was synthesized by using 4,8-dihydrobenzo[1,2-b:4,5-b']dithiophen-4,8dione as the starting material.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Intermolecular Interactions of Ladder-Type Heteroheptacene-Based Nonfullerene Acceptors for Efficient Polymer Solar Cells by Incorporating Asymmetric Side Chains

Tu¹,

Zheng²,

Ma³

et al. 2023

CCS Chem

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Asymmetric nonfullerene acceptors (NFAs) possess larger dipole moments and stronger intermolecular bonding energy than the symmetric counterparts thereby making themselves promising candidates for highperformance polymer solar cells (PSCs). Here, we report two efficient acceptor-donor-acceptor (A-D-A) type NFAs (M14 and M18) with asymmetric side-chains which show enhanced intermolecular interactions compared to their corresponding counterparts (M17 and M19) based on the symmetric side-chains.Furthermore, M14 and M18 exhibit elevated lowest unoccupied molecular orbitals and smaller π-π stacking distances in comparison with M17 and M19, respectively. In combination with the benchmark polymer donor of PM6, the PM6:M14 blend affords superior charge transport property, and more importantly, an increased

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“…11 At this stage, it is important to convey a message that the efficient synthetic strategies to achieve high-performance PDI-based electron acceptors include not only the fusion of several PDI units 12−17 but also the introduction of heteroatoms into the PDI conjugated skeleton. 18,19 The well-known and critical role of heteroatom modification is in enhancing molecular π−π stacking by modulation of molecular geometries. 20−25 For instance, among the fused PDI analogues FPDI-F, FPDI-T, and FPDI-Se, the FPDI-T molecule exhibits the highest ordered packing and strongest π−π stacking due to the modest twist angle between the two PDI units induced by the modest size of sulfur atom.…”

Section: ■ Introductionmentioning

confidence: 99%

Tuning Charge Generation Process of Rylene Imide-Based Solar Cells via Chalcogen-Atom-Annulation

et al. 2019

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A series of high-performance organic semiconductors, which are modulated by introducing heteroatoms to rationally control molecular packing and charge carrier transport, have been successfully reported. However, a fundamental physical understanding of the impact of chalcogen atoms on intermolecular interactions between donors and acceptors as well as photophysical process in photovoltaic cells is still lagging. Herein, a detailed investigation on rylene imide-based solar cells is carried out to reveal the role of chalcogen atoms in controlling intermolecular interactions, molecular orientation in bulk and at the donor− acceptor interface, and polaron-pair dissociation. Compared to their Se-atom-free assisted counterparts, poly{ [4,8-bis[5-(2-ethylhexyl)-4-fluoro-2-thienyl]benzo[1,2-b:4,5-b′]dithiophene2,6diyl]-alt-[2,5-thiophenediyl[5,7-bis(2-ethylhexyl)-4,8-dioxo-4H,8H-benzo[1,2-c:4,5-c′]dithiophene-1,3-diyl]]} (PBDB-TF): selenium-annulated triperylene hexaimide (TPH-Se) bulk heterojunctions preserve face-on orientation and possess smaller domain size, which are partially attributed to the Se•••O van der Waals contacts between the acceptor and polymer chain. This feature enables PBDB-TF:TPH-Se interfaces with enhanced π-orbital overlap, improved charge transfer, a narrowed chargetransfer band, and suppressed polaron-pair binding energy. Consequently, all of the Se-containing solar cells investigated in this manuscript exhibit higher short-circuit current densities and conversion efficiencies than those in Se-atom-free devices. Our results reveal an important molecular design strategy for high-performance rylene imide-based acceptors: efficiently improving the electronic interactions at the D−A interface to increase polaron-pair dissociation and suppress geminate recombination.

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Triplet Tellurophene‐Based Acceptors for Organic Solar Cells

Abstract: Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Cited by 41 publications

References 59 publications

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

Efficient Organic Solar Cells with a High Open‐Circuit Voltage of 1.34 V

Enhancing the Intermolecular Interactions of Ladder-Type Heteroheptacene-Based Nonfullerene Acceptors for Efficient Polymer Solar Cells by Incorporating Asymmetric Side Chains

Tuning Charge Generation Process of Rylene Imide-Based Solar Cells via Chalcogen-Atom-Annulation

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