PS‐<i>b</i>‐P3HT Copolymers as P3HT/PCBM Interfacial Compatibilizers for High Efficiency Photovoltaics

Sun, Zheng; Xiao, Kai; Keum, Jong K.; Yu, Xiang; Hong, Kunlun; Browning, James F.; Ivanov, Ilia N.; Chen, Jihua; Alonzo, José; Li, Dawen; Sumpter, Bobby G.; Payzant, E. Andrew; Rouleau, Christopher M.; Geohegan, David B.

doi:10.1002/adma.201103361

Cited by 112 publications

(105 citation statements)

References 33 publications

(16 reference statements)

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“…Midblock conformational fractions and copolymer morphologies are provided as functions of copolymer composition and temperature. Block copolymers remain one of the most extensively studied genres of macromolecules to date due to their intrinsic ability to (i) self-organize spontaneously into a wide variety of periodic nanostructures 1, 2 and (ii) compatibilize immiscible polymers, 3,4 as well as stabilize polymer nanolaminates, 5,6 by locating at polymer/polymer interfaces. These intriguing soft materials can likewise form molecular and supramolecular networks upon microphase separation.…”

mentioning

confidence: 99%

Communication: Molecular-level insights into asymmetric triblock copolymers: Network and phase development

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Mineart

Woloszczuk

et al. 2014

The Journal of Chemical Physics

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Molecularly asymmetric triblock copolymers progressively grown from a parent diblock copolymer can be used to elucidate the phase and property transformation from diblock to network-forming triblock copolymer. In this study, we use several theoretical formalisms and simulation methods to examine the molecular-level characteristics accompanying this transformation, and show that reported macroscopic-level transitions correspond to the onset of an equilibrium network. Midblock conformational fractions and copolymer morphologies are provided as functions of copolymer composition and temperature.

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mentioning

confidence: 99%

Communication: Molecular-level insights into asymmetric triblock copolymers: Network and phase development

Tallury

Mineart

Woloszczuk

et al. 2014

The Journal of Chemical Physics

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“…This is due to an increasing interest in taking advantage of the nanometer scale resolution provided by neutron reflectometry (NR)/scattering to probe the structure, interface and morphology of bulk heterojunctions (BHJ) in organic photovoltaics (OPV) [9][10][11][12][13][14][15] to determine not only the nanoscopic heterogeneity of donor/acceptor components, but their degree of mixing and the vertical composition. The nanoscopic morphological information provided by isotopic substitution is highly relevant to understand exciton diffusion and charge transport in these devices [9][10][11][12][13][14][15] ; however, deuteration is commonly believed to have little effect on morphology. Only recently, small-angle neutron scattering revealed that deuterium substitution can significantly influence the phase separation kinetics and morphology in some polymer blend systems 16,17 .…”

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confidence: 99%

The isotopic effects of deuteration on optoelectronic properties of conducting polymers

et al. 2014

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The attractive optoelectronic properties of conducting polymers depend sensitively upon intra-and inter-polymer chain interactions, and therefore new methods to manipulate these interactions are continually being pursued. Here, we report a study of the isotopic effects of deuterium substitution on the structure, morphology and optoelectronic properties of regioregular poly(3-hexylthiophene)s with an approach that combines the synthesis of deuterated materials, optoelectronic properties measurements, theoretical simulation and neutron scattering. Selective substitutions of deuterium on the backbone or side-chains of poly(3-hexylthiophene)s result in distinct optoelectronic responses in poly(3-hexylthiophene)/[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) photovoltaics. Specifically, the weak non-covalent intermolecular interactions induced by the main-chain deuteration are shown to change the film crystallinity and morphology of the active layer, consequently reducing the short-circuit current. However, side-chain deuteration does not significantly modify the film morphology but causes a decreased electronic coupling, the formation of a charge transfer state, and increased electron-phonon coupling, leading to a remarkable reduction in the open circuit voltage.

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“…Subsequently, Sun et al utilized 5 wt% copolymer additive polystyrene-block-poly(3-hexylthiophene) (PS-b-P3HT) to obtain favorable BHJ morphology with increased PCEs from 3.3% to 4.1% [49]. The authors elucidated that the additive-induced morphology was resulted from the interaction of PS segment with PC61BM phase and P3HT block with P3HT phase as shown in Figure 3b.…”

Section: Copolymermentioning

confidence: 99%

Morphological Control Agent in Ternary Blend Bulk Heterojunction Solar Cells

et al. 2014

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Bulk heterojunction (BHJ) organic photovoltaic (OPV) promise low cost solar energy and have caused an explosive increase in investigations during the last decade. Control over the 3D morphology of BHJ blend films in various length scales is one of the pillars accounting for the significant advance of OPV performance recently. In this contribution, we focus on the strategy of incorporating an additive into BHJ blend films as a morphological control agent, i.e., ternary blend system. This strategy has shown to be effective in tailoring the morphology of BHJ through different inter-and intra-molecular interactions. We systematically review the morphological observations and associated mechanisms with respect to various kinds of additives, i.e., polymers, small molecules and inorganic nanoparticles. We organize the effects of morphological control (compatibilization, stabilization, etc.) and provide general guidelines for rational molecular design for additives toward high efficiency and high stability organic solar cells.

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PS‐b‐P3HT Copolymers as P3HT/PCBM Interfacial Compatibilizers for High Efficiency Photovoltaics

Abstract: A conducting diblock copolymer of PS-b-P3HT was added to serve as a compatibilizer in a P3HT/PCBM blend, which improved the power-conversion efficiency from 3.3% to 4.1% due to the enhanced crystallinity, morphology, interface interaction, and depth profile of PCBM.

Cited by 112 publications

References 33 publications

Communication: Molecular-level insights into asymmetric triblock copolymers: Network and phase development

Communication: Molecular-level insights into asymmetric triblock copolymers: Network and phase development

The isotopic effects of deuteration on optoelectronic properties of conducting polymers

Morphological Control Agent in Ternary Blend Bulk Heterojunction Solar Cells

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