Correlating photovoltaic properties of a PTB7-Th:PC<sub>71</sub>BM blend to photophysics and microstructure as a function of thermal annealing

Jagadamma, Lethy Krishnan; Sajjad, Muhammad T.; Savikhin, Victoria; Toney, Michael F.; Samuel, Ifor D. W.

doi:10.1039/c7ta03144k

Cited by 63 publications

(29 citation statements)

References 44 publications

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“…The OPV is of the inverted type, where the device consists of the CF unit comprising a Ag-TiO x -Ag cavity, MoO 3 hole transporting layer (HTL), PTB7-Th:PC 71 BM blend active layer, ZnO electron transporting layer, and indium tin oxide (ITO) electrode supported on a glass substrate. The photo voltaic and optical characteristics of the blend have been previously reported, [18][19][20][21] featuring broadband and uniform absorption across the visible range. The photo voltaic and optical characteristics of the blend have been previously reported, [18][19][20][21] featuring broadband and uniform absorption across the visible range.…”

mentioning

confidence: 99%

“…The OPV is of the inverted type, where the device consists of the CF unit comprising a Ag-TiO x -Ag cavity, MoO 3 [3,4-b]thiophenediyl]](PTB7-Th) was used as the donor, and [6,6]-Phenyl C71 butyric acid methyl ester (PC 71 BM) as the acceptor. The photo voltaic and optical characteristics of the blend have been previously reported, [18][19][20][21] featuring broadband and uniform absorption across the visible range. For our studies, we used a 100(±10) nm thick blend in both CF-integrated OPVs and transparent OPV.…”

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confidence: 99%

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Semitransparent Blue, Green, and Red Organic Solar Cells Using Color Filtering Electrodes

Kim

Son

Shafian

et al. 2018

Advanced Optical Materials

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protocols that tailor the absorption spectrum of the active material. [1][2][3][4][5][6] While such efforts have resulted in a library of active materials, they have also presented challenges for commercial viability due to the different processes and costs associated with employing distinct active materials to display different colors. Their use has also resulted in varied performances among devices of different colors, adding to the difficulty for practical implementation. Furthermore, challenges in organic synthesis have limited the achievable types of color and their spectral purity. In this work, we introduce a strategy that enables a single active material that absorbs uniformly across the visible range to display different colors with high spectral purity and consistent device performances through the implementation of a color filtering (CF) electrode. The electrode consists of a Ag-TiO x -Ag Fabry-Perot (FP) resonant cavity, where the thickness of the TiO x layer determines the spectral position of the transmission peak and the inner Ag layer functions as an electrical contact. The electrode also functions as a mirror for all wavelengths of light except that within the resonant band (i.e., the spectral transparency window) of the CF. Therefore, light that has not been selectively transmitted may reflect back into the active material, contributing to additional charge generation. This implies that the short-circuit current density, which is largely a function of the optical absorption, must be higher for a CF-integrated OPV compared to a transparent OPV, under the condition that the two devices show similar peak transmission efficiencies.The use of photonic structures as optical filters in OPVs or inorganic solar cells has been previously reported in the form of distributed Bragg reflectors, [7][8][9] photonic arrays, [10][11][12] and plasmonic resonators. [13][14][15] While such filters enable various colors to be transmitted or reflected through tuning of the characteristic dimension of the filter components, in many cases they suffer from increased fabrication costs and duration because of the structural complexity. Moreover, photonic structures employing low-loss dielectrics exhibit poor electrical conductivity, precluding their use as an electrode. Finally, the structural anisotropy intrinsic to 1D or 3D photonic structures can result in asymmetric responses for light incident from above and below the device. Such behavior can complicate design schemes for creating bidirectional colored windows.Colorful, semitransparent organic photovoltaic cells (OPVs) are increasing in demand due to their applicability in aesthetically fashioned powergenerating windows. The traditional method of generating different colors in OPVs has been through employing different active materials exhibiting distinct absorption spectra. This can complicate fabrication processes for production and cause deviations in device performance among differently colored OPVs. Herein, semitransparent and colorful OPVs with a single broadban...

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confidence: 99%

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confidence: 99%

Semitransparent Blue, Green, and Red Organic Solar Cells Using Color Filtering Electrodes

Kim

Son

Shafian

et al. 2018

Advanced Optical Materials

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“…We obtained a lamellar reflection (100) peak for the in‐plane direction ( d = 24.1 Å). These results indicated a favorable face‐on orientation of PTB7‐Th polymer chains . Both NDI‐dimer films sharp ( q = 0.6 Å −1 ) and weak peaks (1.4–1.5 Å −1 ) in the in‐plane direction.…”

Section: Resultsmentioning

confidence: 81%

Twisted Linker Effect on Naphthalene Diimide‐Based Dimer Electron Acceptors for Non‐fullerene Organic Solar Cells

Kwon

et al. 2018

Macromol. Rapid Commun.

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Naphthalene diimide (NDI) dimers, NDI-Ph-NDI with a phenyl linker and NDI-Xy-NDI with a xylene linker, are designed and synthesized. The influence of the xylene and phenyl linkers on optical properties, electrochemical properties, morphology, and device performance is systematically investigated. Non-fullerene organic solar cells (OSCs) with NDI-Ph-NDI show poor device efficiency due to aggregation of polymer chains and/or NDI dimers caused by the highly planar structure of NDI-Ph-NDI. Although NDI-Xy-NDI is a non-planar structure, uniform surface morphology and weak bimolecular recombination lead to high power conversion efficiencies of 3.11%, which is the highest value in non-fullerene OSCs with NDI small molecules.

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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%

“…[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][30][31][32][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][37][38] Although various ICLs have been developed for tandem OSCs achieving high efficiency, their reliability, reproducibility, and generic applicability were rarely analyzed and reported, which strongly restricts the progress and widespread adoption of tandem OSCs.…”

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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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Correlating photovoltaic properties of a PTB7-Th:PC₇₁BM blend to photophysics and microstructure as a function of thermal annealing

Abstract: The effect of thermal annealing on a polymer solar cell is investigated and related to changes in the photophysics and structure.

Cited by 63 publications

References 44 publications

Semitransparent Blue, Green, and Red Organic Solar Cells Using Color Filtering Electrodes

Semitransparent Blue, Green, and Red Organic Solar Cells Using Color Filtering Electrodes

Twisted Linker Effect on Naphthalene Diimide‐Based Dimer Electron Acceptors for Non‐fullerene Organic Solar Cells

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

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Correlating photovoltaic properties of a PTB7-Th:PC71BM blend to photophysics and microstructure as a function of thermal annealing

Abstract: The effect of thermal annealing on a polymer solar cell is investigated and related to changes in the photophysics and structure.

Cited by 63 publications

References 44 publications

Semitransparent Blue, Green, and Red Organic Solar Cells Using Color Filtering Electrodes

Semitransparent Blue, Green, and Red Organic Solar Cells Using Color Filtering Electrodes

Twisted Linker Effect on Naphthalene Diimide‐Based Dimer Electron Acceptors for Non‐fullerene Organic Solar Cells

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

Contact Info

Product

Resources

About

Correlating photovoltaic properties of a PTB7-Th:PC₇₁BM blend to photophysics and microstructure as a function of thermal annealing