Y6 and its derivatives: molecular design and physical mechanism

Wei, Qiuping; Yuan, Jun; Yi, Yuanping; Zhang, Chunfeng; Zou, Yingping

doi:10.1093/nsr/nwab121

Cited by 65 publications

(61 citation statements)

References 17 publications

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“…[55] Recently, the arc-shaped non-fullerene acceptor Y6 (Figure 3) and its derivatives attracted considerable attention, due to their outstanding photovoltaic performance. [56] More importantly, Y6 and its derivatives can achieve a high EQE and photocurrent with low E loss , compared with classical fullerene and IDT-type acceptors. [57] According to theoretical calculation, Brédas et al pointed out that the molecular packing and charge delocalization of active layer materials had significant impact on non-radiative recombination in OSCs.…”

Section: Materials Designmentioning

confidence: 99%

“…[ 43,55 ] In addition, the formation of triplet exciton in PTB7‐Th:IEICO‐0F based OSCs was suppressed, which contributed to large χ and thus low Δ E 3 (0.22 eV) [55] . Recently, the arc‐shaped non‐fullerene acceptor Y6 ( Figure ) and its derivatives attracted considerable attention, due to their outstanding photovoltaic performance [56] . More importantly, Y6 and its derivatives can achieve a high EQE and photocurrent with low E loss , compared with classical fullerene and IDT‐type acceptors [57] .…”

Section: Investigation Of δE3 In Non‐fullerene Oscsmentioning

confidence: 99%

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Non‐Radiative Recombination Energy Losses in Non‐Fullerene Organic Solar Cells

Zhao

Wang

et al. 2022

Adv Funct Materials

104

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Impressive short-circuit current density and fill factor have been achieved simultaneously in single-junction organic solar cells (OSCs) with the emergence of high-performance non-fullerene acceptors. However, the power conversion efficiencies (PCEs) of OSCs still lag behind those of inorganic and perovskite solar cells, mainly due to the modest open-circuit voltage (V OC ) imposed by relatively large energy loss (E loss ). Generally, E loss in solar cells can be divided into three parts. Among them, ΔE 1 is inevitable for all photovoltaic cells and depends on the optical bandgap of solar cells, while radiative recombination energy loss, ΔE 2 , in OSCs can approach the negligible value via finely matching donor with acceptor material in the blend. The relatively large non-radiative recombination energy loss, ΔE 3 , becomes the main barrier to further reduce E loss and thus enhance PCE in non-fullerene acceptor-based OSCs. In this review, the recent studies and achievements about ΔE 3 in non-fullerene acceptor-based OSCs have been summarized from the aspects of material design, morphology manipulation, ternary strategy, mechanism, and theoretical study. It is hoped that this review helps to get a deep understanding and boost the advance of ΔE 3 study in OSCs.

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Section: Materials Designmentioning

confidence: 99%

Section: Investigation Of δE3 In Non‐fullerene Oscsmentioning

confidence: 99%

Non‐Radiative Recombination Energy Losses in Non‐Fullerene Organic Solar Cells

Zhao

Wang

et al. 2022

Adv Funct Materials

104

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“…The most prominent examples are the Y-series acceptors, which currently also hold the record PCEs. 98 Another strategy is to include π-spacers, whereby compounds with the general structure A−π−D−π−A (Figure 3, right) are obtained. 99 By selecting the appropriate type of π-spacers, the quinoid character of the conjugated backbone can be increased.…”

Section: Non-fullerene Acceptor Designmentioning

confidence: 99%

“…An important modification of the A–D–A structural motif was the introduction of an electron-poor ring into the central donor unit leading to the A–DA′D–A structure type. The most prominent examples are the Y-series acceptors, which currently also hold the record PCEs . Another strategy is to include π-spacers, whereby compounds with the general structure A−π–D−π–A (Figure , right) are obtained .…”

Section: Non-fullerene Acceptor Designmentioning

confidence: 99%

Recent Progress in the Design of Fused-Ring Non-Fullerene Acceptors─Relations between Molecular Structure and Optical, Electronic, and Photovoltaic Properties

Schweda

Reinfelds

Hofstadler

et al. 2021

ACS Appl. Energy Mater.

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Organic solar cells are on the dawn of the next era. The change of focus toward non-fullerene acceptors has introduced an enormous amount of organic n-type materials and has drastically increased the power conversion efficiencies of organic photovoltaics, now exceeding 18%, a value that was believed to be unreachable some years ago. In this Review, we summarize the recent progress in the design of ladder-type fused-ring non-fullerene acceptors in the years 2018–2020. We thereby concentrate on single layer heterojunction solar cells and omit tandem architectures as well as ternary solar cells. By analyzing more than 700 structures, we highlight the basic design principles and their influence on the optical and electrical structure of the acceptor molecules and review their photovoltaic performance obtained so far. This Review should give an extensive overview of the plenitude of acceptor motifs but will also help to understand which structures and strategies are beneficial for designing materials for highly efficient non-fullerene organic solar cells.

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“…The emergence of acceptor-donor-acceptor 0 -donor-acceptor (ADA 0 DA) small molecule acceptors, represented by Y6, has accelerated the development of organic solar cells. [1][2][3][4][5] Different from traditional ADA acceptors with an electron-rich core unit and a linear molecular configuration, 6,7 Y6-type acceptors possess a less electron-rich fused-ring DA 0 D core unit and a banana-shaped configuration. These features significantly influence the molecular orbitals, optoelectronic properties, packing behaviour and charge transport properties of ADA 0 DA acceptors, resulting in high performance in solar cells.…”

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confidence: 99%