Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy

Niklas, Jens; Poluektov, Oleg G.

doi:10.1002/aenm.201602226

Cited by 82 publications

(97 citation statements)

References 216 publications

(413 reference statements)

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“…Examples include identification of paramagnetic defect contents in semiconductors, [5][6][7] investigations of structures and conformational dynamics of biological molecules, [8][9][10] and characterizations of photochemical reactions. [11][12][13] The nitrogen-vacancy (NV) center is of significant interest in quantum sensing due to its unique properties. [14][15][16][17] The NV center is an S = 1 spin system consisting of a single vacancy site located adjacent to a nitrogen atom in the diamond lattice.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Linewidth of the ESR Spectrum Detected by a Single NV Center in Diamond

Fortman

Takahashi

2019

J. Phys. Chem. A

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Spectral analysis of electron spin resonance (ESR) is a powerful technique for various investigations including characterization of spin systems, measurements of spin concentration, and probing spin dynamics. The nitrogen-vacancy (NV) center in diamond is a promising magnetic sensor enabling improvement of ESR sensitivity to the level of a single spin. Therefore, understanding the nature of NV-detected ESR (NV-ESR) spectrum is critical for applications to nanoscale ESR. Within this work we investigate the linewidth of NV-ESR from single substitutional nitrogen centers (called P1 centers). NV-ESR is detected by a double electron-electron resonance (DEER) technique. By studying the dependence of the DEER excitation bandwidth on NV-ESR linewidth, we find that the spectral resolution is improved significantly and eventually limited by inhomogeneous broadening of the detected P1 ESR. Moreover, we show that the NV-ESR linewidth can be as narrow as 0.3 MHz.

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Section: Introductionmentioning

confidence: 99%

Understanding the Linewidth of the ESR Spectrum Detected by a Single NV Center in Diamond

Fortman

Takahashi

2019

J. Phys. Chem. A

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“…To further investigate the increased crystallinity of the P3HT 150 in the blend with PNPs, we applied electron paramagnetic 151 resonance (EPR) spectroscopy, which can provide structural 152 and dynamical information about charge carriers (polarons) in 153 P3HT blends. 45…”

mentioning

confidence: 99%

Hybrid Organic/Inorganic Perovskite–Polymer Nanocomposites: Toward the Enhancement of Structural and Electrical Properties

Privitera

Righetto

Bastiani

et al. 2017

J. Phys. Chem. Lett.

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Hybrid organic/inorganic perovskite nanoparticles (NPs) have garnered remarkable research attention because of their promising photophysical properties. New and interesting properties emerge after combining perovskite NPs with semiconducting materials. Here, we report the synthesis and investigation of a composite material obtained by mixing CHNHPbBr nanocrystals with the semiconducting polymer poly(3-hexylthiophene) (P3HT). By the combination of structural techniques and optical and magnetic spectroscopies we observed multiple effects of the perovskite NPs on the P3HT: (i) an enlargement of P3HT crystalline domains, (ii) a strong p-doping of the P3HT, and (iii) an enhancement of interchain order typical of H-aggregates. These observations open a new avenue toward innovative perovskite NP-based applications.

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“…Whereas the focus of the author's research is on applying TREPR spectroscopy to short-lived excited states, predominantly triplet excitons, EPR spectroscopy can contribute even further to a more thorough understanding of organic electronic materials (Niklas and Poluektov, 2017). Hence, after a primer on EPR spectroscopy, this article first gives an overview of paramagnetic states in OPV devices and organic semiconductors, followed by a more detailed description of the available EPR-spectroscopic experiments to characterize each of these paramagnetic species.…”

Section: Introductionmentioning

confidence: 99%

Structure–Function Relationship of Organic Semiconductors: Detailed Insights From Time-Resolved EPR Spectroscopy

Biskup

2019

Front. Chem.

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Organic photovoltaics (OPV) is a promising technology to account for the increasing demand for energy in form of electricity. Whereas the last decades have seen tremendous progress in the field witnessed by the steady increase in efficiency of OPV devices, we still lack proper understanding of fundamental aspects of light-energy conversion, demanding for systematic investigation on a fundamental level. A detailed understanding of the electronic structure of semiconducting polymers and their building blocks is essential to develop efficient materials for organic electronics. Illuminating conjugated polymers not only leads to excited states, but sheds light on some of the most important aspects of device efficiency in organic electronics as well. The interplay between electronic structure, morphology, flexibility, and local ordering, while at the heart of structure—function relationship of organic electronic materials, is still barely understood. (Time-resolved) electron paramagnetic resonance (EPR) spectroscopy is particularly suited to address these questions, allowing one to directly detect paramagnetic states and to reveal their spin-multiplicity, besides its clearly superior spectral resolution compared to optical methods. This article aims at giving a non-specialist audience an overview of what EPR spectroscopy and particularly its time-resolved variant (TREPR) can contribute to unraveling aspects of structure–function relationship in organic semiconductors.

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Charge Transfer Processes in OPV Materials as Revealed by EPR Spectroscopy

Cited by 82 publications

References 216 publications

Understanding the Linewidth of the ESR Spectrum Detected by a Single NV Center in Diamond

Understanding the Linewidth of the ESR Spectrum Detected by a Single NV Center in Diamond

Hybrid Organic/Inorganic Perovskite–Polymer Nanocomposites: Toward the Enhancement of Structural and Electrical Properties

Structure–Function Relationship of Organic Semiconductors: Detailed Insights From Time-Resolved EPR Spectroscopy

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