Synergistic effect of fluorination on both donor and acceptor materials for high performance non-fullerene polymer solar cells with 13.5% efficiency

Fan, Qunping; Su, Wenyan; Wang, Yan; Guo, Bing; Jiang, Yufeng; Guo, Xia; Liu, Feng; Russell, Thomas P.; Zhang, Maojie; Li, Yongfang

doi:10.1007/s11426-017-9199-1

Cited by 356 publications

(233 citation statements)

References 59 publications

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“…Based on the detailed balance theory, voltage losses in OSCs can be attributed to radiative recombination and nonradiative recombination, and the latter one is relative to the intrinsic feature of the materials. [27][28][29][30][31]32] Molecular design has played a critical role in advancing photovoltaic properties of the NF acceptors. [27][28][29][30][31]32] Molecular design has played a critical role in advancing photovoltaic properties of the NF acceptors.…”

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“…DOI: 10.1002/adma.201707170 potential in realizing low voltage loss (ΔV), [21][22][23][24][25] a value that can be calculated by the equation of qΔV = E gap − qV OC , where E gap is optical bandgap of the donor or the acceptor (which has a smaller one) and V OC is open-circuit voltage (V OC ) of device. [27][28][29][30][31]32] Molecular design has played a critical role in advancing photovoltaic properties of the NF acceptors. [26] In recent years, benefiting from the accumulative progress in molecular design of materials and device fabrication methods, PCEs of the OSCs based on NF acceptors have significantly enhanced and surpassed the state-of-art PCE of fullerene-based OSCs.…”

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A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

et al. 2018

Advanced Materials

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Besides broadening of the absorption spectrum, modulating molecular energy levels, and other well-studied properties, a stronger intramolecular electron push-pull effect also affords other advantages in nonfullerene acceptors. A strong push-pull effect improves the dipole moment of the wings in IT-4F over IT-M and results in a lower miscibility than IT-M when blended with PBDB-TF. This feature leads to higher domain purity in the PBDB-TF:IT-4F blend and makes a contribution to the better photovoltaic performance. Moreover, the strong push-pull effect also decreases the vibrational relaxation, which makes IT-4F more promising than IT-M in reducing the energetic loss of organic solar cells. Above all, a power conversion efficiency of 13.7% is recorded in PBDB-TF:IT-4F-based devices.

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A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

et al. 2018

Advanced Materials

372

287

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“…[1][2][3][4] Most of the investigations in the past decade have focused on the design and synthesis of highly efficient polymer donors, [3][4][5][6][7][8][9] which leads to the fullerene-based devices with power conversion efficiencies (PCEs) over 10%. Recently, benefitting from the rapid development of n-type organic semiconductor (n-OS) small molecule acceptors with the advantages of tunable absorption, energy level, and spatial structure, the performance of PSCs has made a breakthrough over 13%, [13][14][15] which provides a great potential for the preparation of high-performance low-cost solar cells in the future. Recently, benefitting from the rapid development of n-type organic semiconductor (n-OS) small molecule acceptors with the advantages of tunable absorption, energy level, and spatial structure, the performance of PSCs has made a breakthrough over 13%, [13][14][15] which provides a great potential for the preparation of high-performance low-cost solar cells in the future.…”

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Improvement of Photovoltaic Performance of Polymer Solar Cells by Rational Molecular Optimization of Organic Molecule Acceptors

Jia

Angunawela

et al. 2018

Advanced Energy Materials

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The studies of polymer solar cells (PSCs) are always associated with the keywords of solution processing, flexibility, low cost, and low energy budget. [1][2][3][4] Most of the investigations in the past decade have focused on the design and synthesis of highly efficient polymer donors, [3][4][5][6][7][8][9] which leads to the fullerene-based devices with power conversion efficiencies (PCEs) over 10%. [10][11][12] However, further improving the PCE of the fullerene-based PSCs is limited by the difficulty to tune the absorption and electronic energy levels of the fullerene acceptors. Recently, benefitting from the rapid development of n-type organic semiconductor (n-OS) small molecule acceptors with the advantages of tunable absorption, energy level, and spatial structure, the performance of PSCs has made a breakthrough over 13%, [13][14][15] which provides a great potential for the preparation of high-performance low-cost solar cells in the future.For the design of n-OS small mole cule acceptors, it should be noted that currently the most successful acceptors possess Two n-type organic semiconductor (n-OS) small molecules m-ITIC-2F and m-ITIC-4F with fluorinated 2-(2,3-dihydro-3-oxo-1H-inden-1-ylidene)propanedinitrile (IC) terminal moieties are prepared, for the application as an acceptor in polymer solar cells (PSCs), to further improve the photovoltaic performance of the n-OS acceptor 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene) indanone) -5,5,11,11-tetrakis(3-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-sindaceno[1,2-b:5,6-b′]dithiophene (m-ITIC). Compared to m-ITIC, these two new acceptors show redshifted absorption, higher molecular packing order, and improved electron mobilities. The power conversion efficiencies (PCE) of the as-cast PSCs with m-ITIC-2F or m-ITIC-4F as an acceptor and a low-cost donor-acceptor (D-A)copolymer PTQ10 as a donor reach 11.57% and 11.64%, respectively, which are among the highest efficiency for the as-cast PSCs so far. Furthermore, after thermal annealing treatment, improved molecular packing and enhanced phase separation are observed, and the higher PCE of 12.53% is achieved for both PSCs based on the two acceptors. The respective and unique advantage with the intrinsic high degree of order, molecular packing, and electron mobilities of these two acceptors will be suitable to match with different p-type organic semiconductor donors for higher PCE values, which provide a great potential for the PSCs commercialization in the near future. These results indicate that rational molecular structure optimization is of great importance to further improve photovoltaic properties of the photovoltaic materials.

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“…[1][2][3] Thep ower conversion efficiency (PCE) of single-junction fullerene-based PSCs has been attained over 11 %. [5][6][7] Regarding fullerene-based and fused-ring electron acceptor-based devices,a ll-polymer solar cells (all-PSCs) composed of ac onjugated polymer donor and an n-type conjugated polymer offer unique attractions due to their special advantages of morphological stability and flexibility. [5][6][7] Regarding fullerene-based and fused-ring electron acceptor-based devices,a ll-polymer solar cells (all-PSCs) composed of ac onjugated polymer donor and an n-type conjugated polymer offer unique attractions due to their special advantages of morphological stability and flexibility.…”

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Dye‐Incorporated Polynaphthalenediimide Acceptor for Additive‐Free High‐Performance All‐Polymer Solar Cells

et al. 2018

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All-polymer solar cells (all-PSCs) can offer unique advantages for applications in flexible devices,a nd naphthalene diimide (NDI)-based polymer acceptors are the widely used polymer acceptors.H owever,t heir power conversion efficiency (PCE) still lags behind that of state-of-the-art polymer solar cells,d ue to lowl ight absorption, suboptimal energy levels and the strong aggregation of the NDI-based polymer acceptor.H erein, ar hodanine-based dye molecule was introduced into the NDI-based polymer acceptor by simple random copolymerization and showed an improved light absorption coefficient, an up-shifted lowest unoccupied molecular orbital level and reduced crystallization. Consequently,a dditive-free all-PSCs demonstrated ah igh PCE of 8.13 %, which is one of the highest performance characteristics reported for all-PSCs to date.T hese results indicate that incorporating ad ye into the n-type polymer gives insight into the precise design of high-performance polymer acceptors for all-PSCs.Polymer solar cells (PSCs) have made considerable progress during the past two decades. [1][2][3] Thep ower conversion efficiency (PCE) of single-junction fullerene-based PSCs has been attained over 11 %. [4] Recently,P CEs exceeding 13 % have been achieved with proper molecular designs of wideband-gap polymer donors and fused-ring electron acceptors. [5][6][7] Regarding fullerene-based and fused-ring electron acceptor-based devices,a ll-polymer solar cells (all-PSCs) composed of ac onjugated polymer donor and an n-type conjugated polymer offer unique attractions due to their special advantages of morphological stability and flexibility. [8][9][10][11][12][13][14][15][16] Forp ractical applications,t he morphological stability of the all-PSCs against the mechanical and thermal stresses is beneficial for applications in flexible large-scale and stable devices.Although the PCE of all-PSCs has reached 10 %, [15] the performance of all-PSCs still lag behind that of state-of-theart small-molecule-based devices,o wing to the lack of suitable n-type polymer acceptors.T od ate,t he number of polymer acceptors developed for all-PSCs are limited, and only five studies have reported all-PSCs with ap hotovoltaic efficiency over 8% for ab inary system.

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Synergistic effect of fluorination on both donor and acceptor materials for high performance non-fullerene polymer solar cells with 13.5% efficiency

Cited by 356 publications

References 59 publications

A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

A High‐Efficiency Organic Solar Cell Enabled by the Strong Intramolecular Electron Push–Pull Effect of the Nonfullerene Acceptor

Improvement of Photovoltaic Performance of Polymer Solar Cells by Rational Molecular Optimization of Organic Molecule Acceptors

Dye‐Incorporated Polynaphthalenediimide Acceptor for Additive‐Free High‐Performance All‐Polymer Solar Cells

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