Thermally stable, highly efficient, ultraflexible organic photovoltaics

Xu, Xiaomin; Fukuda, Kenjiro; Karki, Akchheta; Park, SungJun; Kimura, Hiroki; Jinno, Hiroaki; Watanabe, Nobuhiro; Yamamoto, Shûhei; Shimomura, Satoru; Kitazawa, Daisuke; Yokota, Tomoyuki; Umezu, Shinjiro; Nguyen, Thuc Quyen

doi:10.1073/pnas.1801187115

Cited by 119 publications

(117 citation statements)

References 40 publications

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“…In other words, patterning onto the ultrathin substrate did not adversely affect the air stability and storage stability of OPVs. The OPVs retained 81% of the initial PCE after 4 months of storage (Figure S8c, Supporting Information), which is almost same as the storage stability of the OPVs without any nanograting structure . These results confirm that ultrathin nanograting polymer substrates can offer excellent solar cell performances.…”

Section: Resultssupporting

confidence: 64%

“…Organic photovoltaics (OPVs) are one of the most promising flexible energy harvesters owing to their light weight and thinness achieved using flexible polymer substrates. Particularly, OPVs fabricated onto ultrathin polymer substrates (less than 5 µm thickness) are extremely flexible and exhibit a high power per weight, which are necessary for wearable electronic devices . In addition to their high power output per unit area, the reduction of device thickness improves the flexibility and adhesion properties to target 3D shaped surfaces, which allow good conformability to textiles or human bodies .…”

Section: Introductionmentioning

confidence: 99%

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Nanograting Structured Ultrathin Substrate for Ultraflexible Organic Photovoltaics

et al. 2020

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The nanopatterning of the surfaces of polymer substrates enhances the performances of photovoltaics. Ultraflexible organic photovoltaics (OPVs) are one of the promising energy harvesters for wearable electronics. A reduction in incident light angle dependence while maintaining the power conversion efficiency (PCE) is desirable for wearable electronics devices in which the angle of incident light continuously changes due to the deformation of the device. However, the nanopatterning of the ultrathin polymer substrates of ultraflexible OPVs using the reported methods is challenging because they fatally damage the substrates. Here, the fabrication of ultraflexible OPVs having a low incident light angle dependence while maintaining a PCE of 10.5% by developing ultrathin nanograting polymer substrates is reported. The nanograting‐patterned fluorinated polymer enables the formation of periodic nanograting structures onto the back surface of a 1 µm thick polymer substrate having a pitch of 760 nm and a height of 100 nm, while the opposite surface remains flat after the formation of the planarization layer. Furthermore, with the nanopatterning of the ultrathin substrate, electron‐transporting layer, and active layer, the ultraflexible OPVs exhibit a PCE of 10.8%. The combination of new materials with the developed patterning method is expected to afford even greater performances.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Nanograting Structured Ultrathin Substrate for Ultraflexible Organic Photovoltaics

et al. 2020

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“…The robustness of PEDOT:PSS‐based ICLs could be enhanced through various modifications and/or treatments on PEDOT:PSS, such as tuning the viscosity of its solution,17 vacuum‐drying13 or thermal annealing at elevated temperatures, e.g., at 120–150 °C 14,24,28. However, these methods still have some limitations, for instance, the vacuum‐drying processing could interrupt the sequential solution‐processing; many of highly efficient photoactive layers are subject to high temperature annealing, due to the morphological sensitivity upon thermal stress 29–33. Moreover, the use of fast‐drying solvents, such as chloroform (CF), can partially circumvent the problem for processing the top cell,34–35 which unavoidably limits the choice of photoactive materials used in the tandem architecture, because many highly efficient photoactive materials require the use of high boiling point solvents or additives to tune the optimized microstructural morphology 36–38.…”

Section: Photovoltaic Performances Of Inverted Single Junction and Homentioning

confidence: 99%

A Cross‐Linked Interconnecting Layer Enabling Reliable and Reproducible Solution‐Processing of Organic Tandem Solar Cells

Liu

Gao

et al. 2020

Advanced Energy Materials

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The performance of tandem organic solar cells (OSCs) is directly related to the functionality and reliability of the interconnecting layer (ICL). However, it is a challenge to develop a fully functional ICL for reliable and reproducible fabrication of solution‐processed tandem OSCs with minimized optical and electrical losses, in particular for being compatible with various state‐of‐the‐art photoactive materials. Although various ICLs have been developed to realize tandem OSCs with impressively high performance, their reliability, reproducibility, and generic applicability are rarely analyzed and reported so far, which restricts the progress and widespread adoption of tandem OSCs. In this work, a robust and fully functional ICL is developed by incorporating a hydrolyzed silane crosslinker, (3‐glycidyloxypropyl)trimethoxysilane (GOPS), into poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), and its functionality for reliable and reproducible fabrication of tandem OSCs based on various photoactive materials is validated. The cross‐linked ICL can successfully protect the bottom active layer against penetration of high boiling point solvents during device fabrication, which widely broadens the solvent selection for processing photoactive materials with high quality and reliability, providing a great opportunity to continuously develop the tandem OSCs towards future large‐scale production and commercialization.

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“…Organic semiconductor material is the foundation of flexible devices, such as flexible displays [7], flexible solar cells [8], and human-friendly wearable electronics [9]. Unlike inorganic semiconductors such as silicon, an organic semi-conductor consists of small molecules or polymers which form solids with weak van der Waals interaction.…”

Section: Organic Materialsmentioning

confidence: 99%

Numerical aspect of large-scale electronic state calculation for flexible device material

Hoshi

Imachi

Kuwata

et al. 2019

Japan J. Indust. Appl. Math.

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Numerical aspects of large-scale electronic state calculation are explored on flexible organic device materials. Physical theory, numerical method and real application studies are discussed in the context of application-algorithmarchitecture co-design. An application study was carried out for disordered organic thin film. Participation ratio, a measure for the spatial extension of electronic wavefunction is focused on, since it is crucial for device property. A data scientific research is reported for a classification problem of disordered The present research was partially supported by JST-CREST project of 'Development of an Eigen-Supercomputing Engine using a Post-Petascale Hierarchical Model', Priority Issue 7 of the post-K project and KAKENHI funds (16KT0016,17H02828). Oakforest-PACS was used through the JHPCN Project (jh170058-NAHI) and through Interdisciplinary Computational Science Program in Center for Computational Sciences, University of Tsukuba. The K computer was used in the HPCI System Research Projects (hp180079, hp180219). Several computations were carried out also on the facilities of the Supercomputer Center,

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Thermally stable, highly efficient, ultraflexible organic photovoltaics

Cited by 119 publications

References 40 publications

Nanograting Structured Ultrathin Substrate for Ultraflexible Organic Photovoltaics

Nanograting Structured Ultrathin Substrate for Ultraflexible Organic Photovoltaics

A Cross‐Linked Interconnecting Layer Enabling Reliable and Reproducible Solution‐Processing of Organic Tandem Solar Cells

Numerical aspect of large-scale electronic state calculation for flexible device material

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