Two nonlinear π-conjugated polymerized small molecular acceptors containing thiophene or 3,4-Difluorothiophene linkage unit for all-polymer solar cells

Zhang, Zhe; Chen, Hongbin; Xiao, Zheng; Zhu, Yu; Wang, Peiran; Zhang, Yunxin; Kan, Bin; Li, Chenxi; Chen, Yongsheng

doi:10.1016/j.orgel.2022.106735

Cited by 7 publications

(4 citation statements)

References 35 publications

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“…By selecting different linkers, two novel nonlinear polymerized acceptors (TZ1 and TZ2) were successfully established (Figure 9c), providing a quite rare case of nonlinear π-conjugated polymerized acceptors. 61 Finally, TZ2-based all-PSC only achieved an unsatisfied PCE of 7.41% mainly due to its inferior nanoscale film morphology (Figure 9d), especially compared to the bundlelike nanofiber networks widely observed in high-performance OSCs currently. In spite of unsatisfied PCEs, this work indeed paved a new pathway to construct nonlinear polymerized acceptors and also excavated the possibility to get highly efficient all-PSCs when considering the diverse structures of both linkers and central units.…”

Section: Reducing Energy Losses By Multiple Conjugation Extension Of ...mentioning

confidence: 95%

“…In view of the sufficient reaction active sites on the central unit of CH-series NFAs, we proposed a new strategy to construct nonlinear polymerized acceptors by use of both central and end units as connection sites. By selecting different linkers, two novel nonlinear polymerized acceptors (TZ1 and TZ2) were successfully established (Figure c), providing a quite rare case of nonlinear π-conjugated polymerized acceptors . Finally, TZ2-based all-PSC only achieved an unsatisfied PCE of 7.41% mainly due to its inferior nanoscale film morphology (Figure d), especially compared to the bundlelike nanofiber networks widely observed in high-performance OSCs currently.…”

Section: D Conjugation Extended A–d–a Type Ch-series Acceptorsmentioning

confidence: 99%

Section: D Conjugation Extended A–d–a Type Ch-series Acceptorsmentioning

confidence: 99%

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Two-Dimensional Conjugation Extended CH-Series Acceptors with a Distinctive A–D–A Character

2023

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Conspectus As one of the most important indicators for evaluating photovoltaic devices, the power conversion efficiencies (PCEs) for the first-class organic solar cells (OSCs) have reached the level of ∼20%, but they still lag far behind that of over 25% for their inorganic counterparts. With the similar if not better fill factor and short-circuit current, this wide gap of PCEs should be fundamentally attributed to the greatly larger nonradiative energy losses in OSCs, which are usually above 0.2 eV for OSCs but only 0.03–0.04 eV for high-performance inorganic solar cells. Note that the stubbornly severe nonradiative recombination in OSCs is associated with multiple characteristics of organic light-harvesting molecules, such as intrinsically large exciton binding energies and small relative dielectric constants, defective intermolecular packing networks, or more crystal defects caused by the flexibility of large organic molecular skeletons, nonideal nanoscale film morphologies, and so on. All the factors above require that rational design of light-harvesting molecules should be carried out not only at single molecule but also at aggregation levels if further dramatic improvement of PCE is to be achieved for OSCs. In this Account, we will first expound the unique merits of acceptor–donor–acceptor (A–D–A) type light-harvesting materials in frontier orbital distribution, energy level tuning, and intermolecular packings, meanwhile revealing the dominant role of A–D–A type molecules in facilitating charge transfer/transport, suppressing energy loss, and improving photovoltaic performance of OSCs eventually. In light of the conspicuous superiority of A–D–A type molecules, a convincing conclusion can be made that further exploration of novel A–D–A type light-harvesting materials is crucially important to shrink the PCE gap between OSCs and inorganic solar cells. Second, our recent studies for a really exciting A–D–A type molecular platform (CH-series) will be discussed comprehensively, involving various high-performance nonfullerene acceptors (NFAs) with small molecular, dimer-like, and polymerized architectures. Note that the most distinctive feature of CH-series NFAs is two-dimensional (2D) conjugation extension, especially for central units. Therefore, the favorable effects of 2D conjugation extension of these molecules on their fundamental physicochemical properties, intermolecular packing modes, blended film morphologies, photovoltaic parameters, and energy losses of resulting OSCs will be fully discussed. Abiding by the unveiled design rules of high-performance A–D–A type NFAs, the highest PCE of approaching 20% has been achieved for OSCs based on CH-series molecules. The evolution path of previous OSCs is based on traditional materials such as that of PCBM, ITIC, Y6, etc. could be one lesson; CH-series molecules are very likely to offer a great platform capable of achieving record-breaking OSCs along with much decreased energy losses, especially considering their wide and various structural modification possibili...

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Section: Reducing Energy Losses By Multiple Conjugation Extension Of ...mentioning

confidence: 95%

Section: D Conjugation Extended A–d–a Type Ch-series Acceptorsmentioning

confidence: 99%

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Two-Dimensional Conjugation Extended CH-Series Acceptors with a Distinctive A–D–A Character

2023

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“…5). 106–108 Compared with TZ1 without fluorine substituents, the fluorinated TZ2 showed downshifted energy levels and better aggregation behavior. 106 When blended with PM6, the TZ2-based OSC presents more efficient exciton dissociation and charge transport, leading to a higher PCE of 7.41% with an improved J SC of 14.94 mA cm −2 , higher than the TZ1-based OSC (4.06%).…”

Section: Recent Developments In Qx-type Acceptorsmentioning

confidence: 99%

Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization

Liu,

Jiang,

Liu

et al. 2024

Energy Environ. Sci.

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The Development of Quinoxaline‐Based Electron Acceptors for High Performance Organic Solar Cells

Liu,

Geng,

Xiao

et al. 2024

Advanced Materials

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In the recent advances of organic solar cells (OSCs), quinoxaline (Qx)‐based nonfullerene acceptors (QxNFAs) have attracted lots of attention and enabled the recorded power conversion efficiency approaching 20%. As an excellent electron‐withdrawing unit, Qx possesses advantages of many modifiable sites, wide absorption range, low reorganization energy, and so on. To develop promising QxNFAs to further enhance the photovoltaic performance of OSCs, it is necessary to systematically summarize the QxNFAs reported so far. In this review, all the focused QxNFAs are classified into five categories as following: SM‐Qx, YQx, fused‐YQx, giant‐YQx, and polymer‐Qx according to the molecular skeletons. The molecular design concepts, relationships between the molecular structure and optoelectronic properties, intrinsic mechanisms of device performance are discussed in detail. At the end, the advantages of this kind of materials are summed up, the molecular develop direction is prospected, the challenges faced by QxNFAs are given, and constructive solutions to the existing problems are advised. Overall, this review presents unique viewpoints to conquer the challenge of QxNFAs and thus boost OSCs development further toward commercial applications.

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Two nonlinear π-conjugated polymerized small molecular acceptors containing thiophene or 3,4-Difluorothiophene linkage unit for all-polymer solar cells

Cited by 7 publications

References 35 publications

Two-Dimensional Conjugation Extended CH-Series Acceptors with a Distinctive A–D–A Character

Two-Dimensional Conjugation Extended CH-Series Acceptors with a Distinctive A–D–A Character

Quinoxaline-based nonfullerene acceptors with powerful core-functionalization ability enabling efficient solar energy utilization

The Development of Quinoxaline‐Based Electron Acceptors for High Performance Organic Solar Cells

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