High-performance all-polymer solar cells enabled by a novel low bandgap non-fully conjugated polymer acceptor

Fan, Qunping; Ma, Ruijie; Liu, Tao; Yu, Jianwei; Xiao, Yiqun; Su, Wenyan; Cai, Guilong; Li, Yuxiang; Peng, Wenhong; Guo, Tao; Luo, Zhenghui; Sun, Huiliang; Hou, Lintao; Zhu, Weiguo; Lu, Xinhui; Gao, Feng; Moons, Ellen; Yu, Daquan; Yan, He; Wang, Ergang

doi:10.1007/s11426-021-1020-7

Cited by 58 publications

(51 citation statements)

References 74 publications

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“…Compared with SMAs‐based PSCs, all‐polymer solar cells (all‐PSCs) will find applications in wearable and portable electronics because of good morphological and mechanical stabilities 3 . However, the PCEs for all‐PSCs are lower than that of SMA‐based PSCs because excellent polymer acceptors are not sufficient 4,5 . Therefore, there is an urgent need to develop novel polymer acceptors with desirable characteristics that can match those of wide‐bandgap polymer donors (PBDB‐T, PM6, D18, and so on) 2,6 …”

Section: Figurementioning

confidence: 99%

“…3 However, the PCEs for all-PSCs are lower than that of SMA-based PSCs because excellent polymer acceptors are not sufficient. 4,5 Therefore, there is an urgent need to develop novel polymer acceptors with desirable characteristics that can match those of wide-bandgap polymer donors (PBDB-T, PM6, D18, and so on). 2,6 During the historical development of polymer acceptors, many electron-deficient building blocks have been developed and implemented into constructing novel n-type polymers, such as perylenediimide (PDI), naphthalenediimide (NDI), isoindigo, B!N bridged bipyridine, and cyanobenzothiadiazole.…”

Section: Introductionmentioning

confidence: 99%

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Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Kong

Yuan

et al. 2022

InfoMat

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All-polymer solar cells (all-PSCs) have received attention due to their morphological stability under thermal and mechanical stresses. Currently, the highest reported power conversion efficiency of all-PSCs is over 17%, achieved by utilizing polymerized small molecular acceptors (PSMAs). However, the need for higher regiospecificity to avoid forming isomers during polymerization of SMAs still challenges the further applications of all-PSCs. From this perspec-

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Section: Figurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Kong

Yuan

et al. 2022

InfoMat

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“…[29,30] More importantly, physicochemical and photovoltaic properties of the PSMAs can be fine-tuned by copolymerizing appropriate SMA building blocks with different aromatic units. [31][32][33][34][35] Afterward, a series of PSMAs were designed and synthesized. Among them, Y6-series SMA-based PSMAs exhibit obviously improved photovoltaic performance, [36][37][38][39] narrowing the efficiency gap with SMA-based PSCs.…”

Section: Introductionmentioning

confidence: 99%

Polymerized Small Molecular Acceptor with Branched Side Chains for All Polymer Solar Cells with Efficiency over 16.7%

Song

Dong

et al. 2022

Advanced Materials

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The power conversion efficiencies (PCEs) of small molecule acceptor (SMA)‐based organic solar cells have already exceeded 18%. However, the development of polymer acceptors still lags far behind their SMA counterparts mainly due to the lack of efficient polymer acceptors. Herein, a series of polymer acceptors named PY‐X (with X being the branched alkyl chain) are designed and synthesized by employing the same central core with the SMA L8‐BO but with different branched alkyl chains on the pyrrole motif. It is found that the molecular packing of SMA‐HD featuring 2‐hexyldecyl side chain used in the synthesis of PY‐HD is similar to L8‐BO, in which the branched alkyl chains lead to condensed and high‐order molecular assembly in SMA‐HD molecules. When combined with PM6, PY‐HD‐based all polymer solar cell (all‐PSC) exhibits a high PCE of 16.41%, representing the highest efficiency for the binary all‐PSCs. Moreover, the side‐chain modification on the pyrrole site position further improves the performance of the all‐PSCs, and the PY‐DT‐based device delivers a new record high efficiency of 16.76% (certified as 16.3%). The work provides new insights for understanding the structure–property relationship of polymer acceptors and paves a feasible avenue to develop efficient conjugated polymer acceptors.

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“…[12][13][14][15][16][17][18][19][20][21][22][23][24][25] These remarkable advances are stemmed from multiple structure modifications of SMAs including side-chains, electron-rich cores and electron-deficient terminal groups, enabling precise control over their optical properties, energy levels and crystallization/aggregation behaviors. [12][13][14][15][26][27][28][29][30][31][32][33][34][35][36][37][38][39] The evolution of material development in OSCs in the past few years has established a huge library of structure-performance relationship for the design of…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Isomer Effects in Benzo[c ][1,2,5]thiadiazole‐Fused Nonacyclic Acceptors: Dielectric Constant and Molecular Crystallinity Control for Significant Photovoltaic Performance Enhancement

Gao

Fan

Feng

et al. 2021

Adv Funct Materials

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Herein, asymmetric isomer effects are systematically explored by designing and synthesizing two benzo[c][1,2,5]thiadiazole (BT)‐fused nonacyclic electron acceptors. By changing from BP6T‐4F to asymmetric ABP6T‐4F, significantly enhanced dielectric constant and inhibited excessive molecular aggregation and unfavorable edge‐on orientation could be achieved. The reduced exciton binding energy also facilitates a more efficient dissociation process in PM6:ABP6T‐4F compared to PM6:BP6T‐4F with the same energy offset. Moreover, the weaker crystallization behavior enables a significantly enhanced miscibility between PM6 and ABP6T‐4F than that between PM6 and BP6T‐4F, which leads to an optimized micromorphology with smooth surface, suitable domain size, and ordered π–π stacking. Organic solar cells (OSCs) based on PM6:ABP6T‐4F achieve a 15.8% power conversion efficiency (PCE), which is remarkably higher than that of PM6:BP6T‐4F‐based OSCs (6.4%). Furthermore, ternary devices are also fabricated considering good compatibility between ABP6T‐4F and CH1007 to deliver a PCE over 17%. This study reveals the effectiveness and great potential of asymmetric isomerization strategy in regulating molecular properties, which will provide guidance for the future design of non‐fullerene acceptors.

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High-performance all-polymer solar cells enabled by a novel low bandgap non-fully conjugated polymer acceptor

Cited by 58 publications

References 74 publications

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Polymerized Small Molecular Acceptor with Branched Side Chains for All Polymer Solar Cells with Efficiency over 16.7%

Asymmetric Isomer Effects in Benzo[c ][1,2,5]thiadiazole‐Fused Nonacyclic Acceptors: Dielectric Constant and Molecular Crystallinity Control for Significant Photovoltaic Performance Enhancement

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