A New Function of N719: N719 Based Solution‐Processible Binary Cathode Buffer Layer Enables High‐Efficiency Single‐Junction Polymer Solar Cells

Li, Weiping; Yan, Dong; Liu, Wenxu; Chen, Jie; Xu, Wei; Chen, Zhan; Yao, Jiannian

doi:10.1002/solr.201700014

Cited by 25 publications

(15 citation statements)

References 50 publications

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“…Nonfullerene (NF)‐polymer solar cells (PSCs) have attracted great attention and achieved great success, and the power conversion efficiencies (PCEs) have reached 10–13% in the past few years . Compared to the fullerene acceptors, the n‐type organic semiconductor (n‐OS) acceptors possess distinctively advantages, such as highly adjustable optical absorption, readily tunable frontier energy levels, low production cost, and large material selections .…”

Section: Photovoltaic Parameters Of the Pm6:idic (1:1 W/w)‐based Pscsmentioning

confidence: 99%

“…Although the success of NF‐PSCs, the device fabrication can be quite tricky, which requires systematic optimization by using thermal annealing, solvent vapor annealing, or specific amount of solvent additives . Without extra treatments, the efficiency of the NF‐PSCs can only get to a level in‐between 9–10%, as shown in Figure S1 and Table S1 (Supporting Information) .…”

Section: Photovoltaic Parameters Of the Pm6:idic (1:1 W/w)‐based Pscsmentioning

confidence: 99%

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High‐Performance As‐Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency

et al. 2017

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In this work, a nonfullerene polymer solar cell (PSC) based on a wide bandgap polymer donor PM6 containing fluorinated thienyl benzodithiophene (BDT-2F) unit and a narrow bandgap small molecule acceptor 2,2'-((2Z,2'Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b']dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IDIC) is developed. In addition to matched energy levels and complementary absorption spectrum with IDIC, PM6 possesses high crystallinity and strong π-π stacking alignment, which are favorable to charge carrier transport and hence suppress recombination in devices. As a result, the PM6:IDIC-based PSCs without extra treatments show an outstanding power conversion efficiency (PCE) of 11.9%, which is the record value for the as-cast PSC devices reported in the literature to date. Moreover, the device performances are insensitive to the active layer thickness (≈95-255 nm) and device area (0.20-0.81 cm ) with PCEs of over 11%. Besides, the PM6:IDIC-based flexible PSCs with a large device area of 1.25 cm exhibit a high PCE of 6.54%. These results indicate that the PM6:IDIC blend is a promising candidate for future roll-to-roll mass manufacturing and practical application of highly efficient PSCs.

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Section: Photovoltaic Parameters Of the Pm6:idic (1:1 W/w)‐based Pscsmentioning

confidence: 99%

Section: Photovoltaic Parameters Of the Pm6:idic (1:1 W/w)‐based Pscsmentioning

confidence: 99%

High‐Performance As‐Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency

et al. 2017

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“…The efficiency was increased from 8.12% to 8.52% in PTB7:PC 71 BM devices (Table ). Recently, Yao and co‐workers reported a new SME interlayer based on N719 for use in ternary OSCs with one donor of poly[(2,6‐(4,8‐bis(5‐(2‐ethylhexyl)thiophen‐2‐yl)benzo[1,2‐b:4,5‐b′]dithiophene)‐co‐(1,3‐di(5‐thiophene‐2‐yl)‐5,7‐bis(2‐ethylhexyl)benzo[1,2‐c:4,5‐c′] dithiophene‐4,8‐dione)] (PBDB‐T) and two acceptors of ITIC and PC 71 BM, further increasing the efficiency to 11.46% (Table ) …”

Section: Small Molecule Cathode Interlayermentioning

confidence: 99%

Small Molecule Interlayers in Organic Solar Cells

Zhang

Usman

2018

Advanced Energy Materials

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This review provides an up‐to‐date review about the small molecule interlayers (SMIs) in organic solar cells (OSCs). Compared to polymer interlayers, SMIs exhibit intrinsic advantages such as easy synthesis and purification, monodispersity, well‐defined chemical structure, and high batch‐to‐batch reproducibility. Recently, various SMIs have been reported with landmark efficiencies of over 10% in both conventional and inverted OSCs, exhibiting promising potential in commercial application. In this review, the authors summarize the progress of SMIs from a device fabrication point of view, paying particular attention to the material categories, molecular design, preparation process, and applicable device structure. In addition, the working mechanisms of different SMIs are also discussed, including the structure–property relationships and the corresponding impact on device performance. Finally, a brief outlook is provided that includes opportunities and challenges in this emerging area.

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“…To achieve foldable solar cells, polymer solar cells with the advantages of low cost, lightweight, compatibility of roll‐to‐roll process, and high flexibility, are chosen as prototype solar cells. Polymer solar cell was fabricated on cellophane/OMO with the architecture of cellophane/OMO/ZnO/PTB7‐Th:PC 71 BM/MoO 3 /Al (Figure a).…”

Section: Resultsmentioning

confidence: 93%

Realization of Foldable Polymer Solar Cells Using Ultrathin Cellophane Substrates and ZnO/Ag/ZnO Transparent Electrodes

Liu

Wang

et al. 2018

Solar RRL

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Foldable solar cells have attracted increasing attention for portable and wearable applications. The challenge to achieve foldability is free from the formation of cracks under large strain. Our mechanical simulations suggests that a reduction in substrate thickness from 150 to 25 μm is a means to mitigate the strain in polymer solar cells under folding with extremely small curvature radius of sub‐millimeter. The polymer solar cells are experimentally prepared on ultrathin 25 μm cellophane substrates with ZnO/ultrathin Ag/ZnO (OMO) transparent electrodes, instead of conventional ITO, composing a typical device structure, cellophane/OMO/ZnO/PTB7‐Th:PC71BM/MoO3/Al. The solar cells exhibit a power conversion efficiency of 5.94% and a power weight ratio of 2.11 W g−1. After folding the solar cells for 35 cycles, the conversion efficiency still maintained 92% of the initial value, which is mainly ascribed to the synergistic effects of ultrathin substrates and the OMO electrodes, as inferred from the stable resistance of the cellophane/ZnO/ultrathin Ag/ZnO even after 50 folding cycles. This work paves the way toward realizing superior foldability not only in solar cells, but also in other optoelectronic devices.

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A New Function of N719: N719 Based Solution‐Processible Binary Cathode Buffer Layer Enables High‐Efficiency Single‐Junction Polymer Solar Cells

Cited by 25 publications

References 50 publications

High‐Performance As‐Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency

High‐Performance As‐Cast Nonfullerene Polymer Solar Cells with Thicker Active Layer and Large Area Exceeding 11% Power Conversion Efficiency

Small Molecule Interlayers in Organic Solar Cells

Realization of Foldable Polymer Solar Cells Using Ultrathin Cellophane Substrates and ZnO/Ag/ZnO Transparent Electrodes

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