On the packing and the orientation of P(NDI2OD-T2) at low molecular weight

Porzio, William; Scavia, Guido; Barba, Luisa; Arrighetti, Gianmichele; McNeill, Christopher R.

doi:10.1016/j.eurpolymj.2014.10.005

Cited by 15 publications

(14 citation statements)

References 56 publications

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“…S is calculated for the first‐order alkyl stacking peak (Figure h). From Figure h there is a systematic increase in S from S = −0.43 for the highest (41 kDa) MW sample to S = −0.25 for the lowest (10 kDa) MW sample, consistent with previous observations of a preference for lower molecular weight samples to orient more edge‐on …”

Section: Resultssupporting

confidence: 90%

Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n‐type Semiconducting Polymer P(NDI2OD‐T2)

Nahid

Matsidik

Welford

et al. 2017

Adv Funct Materials

110

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The charge transport and microstructural properties of five different molecular weight (MW) batches of the naphthalenediimide-thiophene copolymer P(NDI2OD-T2) are investigated. In particular, the field-effect transistor (FET) performance and thin-film microstructure of samples with MW varying from M n = 10 to 41 kDa are studied. Unlike conventional semiconducting polymers such as poly(3-hexylthiophene) where FET mobility dramatically drops with decreasing molecular weight, the FET mobility of P(NDI2OD-T2)-based transistors processed from 1,2-dichlorobenzene is found to increase with decreasing MW. Using a combination of grazing-incidence wide-angle X-ray scattering, near-edge X-ray absorption fine-structure spectroscopy, atomic force microscopy, and resonant soft X-ray scattering, the increase in FET mobility with decreasing MW is attributed to the pronounced increase in the orientational correlation length (OCL) with decreasing MW. In particular, the OCL is observed to systematically increase from <100 nm for the highest MW samples to ≈1 µm for the lowest MW samples. The improvement in OCL and hence mobility for low MW samples is attributed to the lack of aggregation of low MW chains in solution promoting backbone ordering, with the pre-aggregation of chains in 1,2-dichlorobenzene found to suppress longer-range liquid crystalline order.

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Section: Resultssupporting

confidence: 90%

Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n‐type Semiconducting Polymer P(NDI2OD‐T2)

Nahid

Matsidik

Welford

et al. 2017

Adv Funct Materials

110

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“…The P(NDI2OD‐T2) is semicrystalline and multiple peaks are found in the GIWAXS images. In the unstrained films, there are in‐plane (200) peaks associated P(NDI2OD‐T2) that suggest that crystallites of this polymer pack primarily face‐on . When strain oriented, GIWAXS measurements were made with the X‐ray beam parallel and perpendicular to the strain direction.…”

Section: Resultsmentioning

confidence: 99%

Panchromatic All‐Polymer Photodetector with Tunable Polarization Sensitivity

Sen

Yang

Rech

et al. 2018

Advanced Optical Materials

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In this report, a high‐performance all‐polymer organic photodetector that is sensitive to linearly polarized light throughout the visible spectrum is demonstrated. The active layer is a bulk heterojunction composed of an electron donor polymer PBnDT‐FTAZ and acceptor polymer P(NDI2OD‐T2) that have complementary spectral absorption resulting in efficient detection from 350 to 800 nm. The blend film exhibits good ductility with the ability to accommodate large strains of over 60% without fracture. This allows the film to undergo large uniaxial strain resulting in in‐plane alignment of both polymers making the film optically anisotropic and intrinsically polarization sensitive. The films are characterized by UV–vis spectroscopy and grazing incidence wide‐angle X‐ray scattering showing that both polymers have similar in‐plane backbone alignment and maintain packing order after being strained. The films are integrated into devices and characterized under linear polarized light. The strain‐oriented detectors have maximum photocurrent anisotropies of 1.4 under transverse polarized light while maintaining peak responsivities of 0.21 A W−1 and a 3 dB cutoff frequency of ≈1 kHz. The demonstrated performance is comparable to the current state of the art all‐polymer photodetectors with the added capability of polarization sensitivity enabling new application opportunities.

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“…Detailed measurement conditions and data treatment can be found in a previously published work. [34]…”

Section: Methodsmentioning

confidence: 99%

Transfer-printing of active layers to achieve high quality interfaces in sequentially deposited multilayer inverted polymer solar cells fabricated in air

Vohra

Anzai

Inaba

et al. 2016

Science and Technology of Advanced Materials

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Polymer solar cells (PSCs) are greatly influenced by both the vertical concentration gradient in the active layer and the quality of the various interfaces. To achieve vertical concentration gradients in inverted PSCs, a sequential deposition approach is necessary. However, a direct approach to sequential deposition by spin-coating results in partial dissolution of the underlying layers which decreases the control over the process and results in not well-defined interfaces. Here, we demonstrate that by using a transfer-printing process based on polydimethylsiloxane (PDMS) stamps we can obtain increased control over the thickness of the various layers while at the same time increasing the quality of the interfaces and the overall concentration gradient within the active layer of PSCs prepared in air. To optimize the process and understand the influence of various interlayers, our approach is based on surface free energy, spreading parameters and work of adhesion calculations. The key parameter presented here is the insertion of high quality hole transporting and electron transporting layers, respectively above and underneath the active layer of the inverted structure PSC which not only facilitates the transfer process but also induces the adequate vertical concentration gradient in the device to facilitate charge extraction. The resulting non-encapsulated devices (active layer prepared in air) demonstrate over 40% increase in power conversion efficiency with respect to the reference spin-coated inverted PSCs.

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On the packing and the orientation of P(NDI2OD-T2) at low molecular weight

Cited by 15 publications

References 56 publications

Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n‐type Semiconducting Polymer P(NDI2OD‐T2)

Unconventional Molecular Weight Dependence of Charge Transport in the High Mobility n‐type Semiconducting Polymer P(NDI2OD‐T2)

Panchromatic All‐Polymer Photodetector with Tunable Polarization Sensitivity

Transfer-printing of active layers to achieve high quality interfaces in sequentially deposited multilayer inverted polymer solar cells fabricated in air

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