Flow-enhanced solution printing of all-polymer solar cells

Diao, Ying; Zhou, Yan; Kurosawa, Takao; Shaw, Leo; Wang, Cheng; Park, Steve; Guo, Yangyang; Reinspach, Julia; Gu, Kevin; Gu, Xiaodan; Tee, Benjamin C. K.; Pang, Changhyun; Yan, Hongping; Zhao, Dahui; Toney, Michael F.; Mannsfeld, Stefan C. B.; Bao, Zhenan

doi:10.1038/ncomms8955

Cited by 232 publications

(270 citation statements)

References 65 publications

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“…[1][2][3][4][5][6][7][8][9][10][11][12] The combination of these merits render OSCs suitable as low-cost power sources for portable electronic devices, like displays and other wearable electronic devices. [1][2][3][4][5][6][7][8][9][10][11][12] The combination of these merits render OSCs suitable as low-cost power sources for portable electronic devices, like displays and other wearable electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Flexible all-solution-processed all-plastic multijunction solar cells for powering electronic devices

et al. 2016

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We demonstrate the first all-plastic multijunction solar cells that all layers are solution processed sequentially from organic synthetic inks, including the electrodes, charge-collecting layers, the active layers, and the charge-recombination layers connecting the multiple junctions. Additionally, to our knowledge, this is the first reported organic tandem solar cells can simultaneously have the advantages of vacuum-free, metal-free, highly flexible and high output voltage. The realization of the all-plastic multijunction solar cells is based on fine tuning of the conductivity of the charge-recombination layer (CRL) via modifying the PEDOT:PSS formulation and selecting the processing solvent of the polyethylenimine to avoid the patterning and shorts. These cells with high photovoltage have been shown to meet the requirements to power liquid-crystal displays, full-color light-emitting diodes under low-intensity light conditions. They could become very low-cost solutions for powering various portable and wearable electronic devices, including wireless sensors for the internet of things applications.Flexible all-plastic multijunction solar cells with high photovoltage have been demonstrated via optimizing the charge-recombination layer and shown to power portable electronics. AbstractLow-cost, light-weight and flexible power supply is highly desirable for portable electronic devices. All-plastic solar cells in which all layers are fabricated sequentially from organic synthetic inks could meet these requirements. Here, we report that fully solutionprocessed all-plastic multijunction solar cells can be easily fabricated layer by layer without the need of sophisticated patterning. The key for the high-yield fully solution-processed multijunction cells is the control and tuning of the conductivity of the charge-recombination layer of PEDOT:PSS/PEI. The all-plastic multijunction solar cells achieve PCE of 6.1±0.4%and a high open-circuit voltage of 5.37 V. These all-plastic multijunction solar cells are successfully used to drive liquid-crystal displays, full-color light-emitting diodes and for water splitting under different light illumination conditions.

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Section: Introductionmentioning

confidence: 99%

Flexible all-solution-processed all-plastic multijunction solar cells for powering electronic devices

et al. 2016

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“…12,[14][15][16][17][28][29][30][31][32][33] In BHJ architectures with perylene diimides, care must be taken to find the correct balance for aggregation that leads to efficient charge separation and mobility, but not so much as to lead to complete phase separation. In light of these few examples, there is still much room to address the significant limitations of fullerene acceptors, specifically: they have relatively weak absorption in the visible and often constitute a large fraction of the material in the film; and they have relatively limited tunability of 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 4 their electronic and optical properties.…”

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confidence: 99%

High-Performance Electron Acceptor with Thienyl Side Chains for Organic Photovoltaics

et al. 2016

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We develop an efficient fused-ring electron acceptor (ITIC-Th) based on indacenodithieno[3,2-b]thiophene core and thienyl side-chains for organic solar cells (OSCs). Relative to its counterpart with phenyl side-chains (ITIC), ITIC-Th shows lower energy levels (ITIC-Th: HOMO = -5.66 eV, LUMO = -3.93 eV; ITIC: HOMO = -5.48 eV, LUMO = -3.83 eV) due to the σ-inductive effect of thienyl side-chains, which can match with high-performance narrow-band-gap polymer donors and wide-band-gap polymer donors. ITIC-Th has higher electron mobility (6.1 × 10(-4) cm(2) V(-1) s(-1)) than ITIC (2.6 × 10(-4) cm(2) V(-1) s(-1)) due to enhanced intermolecular interaction induced by sulfur-sulfur interaction. We fabricate OSCs by blending ITIC-Th acceptor with two different low-band-gap and wide-band-gap polymer donors. In one case, a power conversion efficiency of 9.6% was observed, which rivals some of the highest efficiencies for single junction OSCs based on fullerene acceptors.

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“…In order to take full advantage of the enhanced solubility, all polymer solar cells were fabricated via solution shearing, a technology able to coat large area substrates. [28] For all-polymer solar cells the molecular structure of both donor and acceptor polymers, as well as the solubility and the aggregation in solution of the polymers are of paramount importance in order to achieve high performing photovoltaic devices. A perylene tetracarboxylic diimide based polymer, namely P(TP), was chosen as electron accepting polymer because it was previously used in conjunction with isoindigo based polymers and the corresponding devices showed excellent power conversion efficiencies.…”

Section: Introductionmentioning

confidence: 99%

Non‐Conjugated Flexible Linkers in Semiconducting Polymers: A Pathway to Improved Processability without Compromising Device Performance

Schroeder

Chiu

et al. 2016

Adv Elect Materials

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Keywords: semiconducting polymer, glass transition temperature, all-polymer solar cell, organic field effect transistor, isoindigo Semiconducting polymers, in contrast to inorganic silicon, are solution processable and can potentially be printed cost efficiently on flexible large-area substrates. However to do so it is of paramount importance to formulate the polymeric semiconductors into inks with specific viscosities. Herein we present the synthesis of a new highly soluble isoindigo monomer and its incorporation into low bandgap semiconducting polymers. Non-conjugated flexible linkers are introduced into the conjugated backbone in order to modulate the materials processability.The viscoelastic properties of the new polymers are studied in detail by means of rheometry and dynamical mechanical analysis (DMA). The solution viscosity is directly proportional to the content of non-conjugated linkers in the polymer backbone. In organic field-effect transistors (OFETs) maximum hole mobilities of 1. oligomer side chains to enhance the solubility. [1,2] Even though these approaches have proven to be extremely successful, the introduction of a large number of long electrically insulating side chains may reduce the inter-chain charge transport as well as hinder the charge transfer from donor to acceptor in organic photovoltaic devices. [3] Choosing the right combination between side chain structure, length and density along the conjugated backbone is non-trivial and can quickly lead to adverse effects, making the screening process very time consuming.An alternative approach to solubilising side chains is to increase the disorder along the conjugated backbone and to disturb the molecular aggregation, thus facilitating the solution processability. Increasing the energetic disorder within a conjugated polymer chain can be achieved by introducing large rotational angles along the backbone by homo-coupling six-membered aromatic rings (i.e. biphenyl, bipyridine, etc.). Or alternatively by introducing sterically hindered head-to-head couplings into the backbone. In both cases the steric hindrance will lead to an increase in rotational 3 disorder along the polymer chain and reduced molecular aggregation in solution. [4] Unfortunately, the increase in rotational disorder with these approaches is not limited to the solution phase, but also translates into the solid state. Because the steric hindrance is 'locked' into the molecular structure of the polymer backbone, it is irreversible and leads to poor solid state order and inferior electronic properties. A less explored approach to increase energetic disorder along the polymer chain is to introduce non-conjugated, more flexible segments into the backbone. Introducing flexible linkers increases the polymer's solubility, but crucially should also allow the polymer chain to pack densely in solid state because the backbone rigidity is not perturbed by sterically induced disorder.In this paper we investigate how the introduction of flexible linkers into the conjugated backbone influ...

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Flow-enhanced solution printing of all-polymer solar cells

Cited by 232 publications

References 65 publications

Flexible all-solution-processed all-plastic multijunction solar cells for powering electronic devices

Flexible all-solution-processed all-plastic multijunction solar cells for powering electronic devices

High-Performance Electron Acceptor with Thienyl Side Chains for Organic Photovoltaics

Non‐Conjugated Flexible Linkers in Semiconducting Polymers: A Pathway to Improved Processability without Compromising Device Performance

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