Chirality Specific Triplet Exciton Dynamics in Highly Enriched (6,5) and (7,5) Carbon Nanotube Networks

Abudulimu, Abasi; Spaeth, Florian; Namal, İmge; Hertel, Tobias; Lüer, Larry

doi:10.1021/acs.jpcc.6b03923

Cited by 9 publications

(15 citation statements)

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“…Charges or triplets, for example, are reported to live for nanoseconds. [ 38 ] Figure 3b,e depicts that the amplitude of the

P A_{normals}

and

P A_{normalc}

in the OPV48:PCBM sample with SWNTs are larger, while the amplitude of PB is lower, and they decay faster (see also Figure S5, Supporting Information). The variation of pump intensity did not result in any significant difference in the

P A_{normals}

amplitude w/o SWNTs (see Figure S6, Supporting Information), but with SWNTs the decay of

P A_{normalc}

slowed down slightly at high pump intensity (see Figure S7, S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…However, we have previously reported that when a sample contains mixed chiralities, substantial photoexcitation transfer occurs from larger bandgap tube to lower bandgap tube within 100 ps in pure SWNTs samples (without a donor or acceptor material). [ 38 ] Nonetheless, since we pumped our sample at 532 nm (relevant to the solar cells), the photoexcited‐state dynamics in our sample is very much dominated by the charge dynamics of the polymer:PCBM blends.…”

Section: Resultsmentioning

confidence: 99%

“…SWNTs: SWNT dispersion was prepared based on chirality-specific SWNT extraction techniques by polyfluorenes, for details refer to the previous study (37). [38] Solar Cells Active Layer Materials: Regioregular poly (3-hexyl thiophene) [RR-P3HT]-the donor material. PBTZT-stat-BDTT-8 (OPV48)-another donor material.…”

Section: Methodsmentioning

confidence: 99%

“…Transient Absorption Spectroscopy: TA spectroscopy measurements were carried out on a probe wavelength scale ranging from 477 nm to1400 nm, from 100 femtoseconds to 10 microseconds with Clark-MXR, CPA-2001 system (driven at 1 kHz by a regenerative amplifier) combined with a 300 picosecond 532 nm pulsed laser and a BNC (Model 575 Pulse/ Delay Generator, to control nano-microsecond pump-probe delays electronically), for details refer to previous studies (37) and (43). [38,44] The pump laser spot size on the sample is about 300 um, while it is about 150 um for the probe, and the pump energy ranges from 4 to 45 nJ.…”

Section: Methodsmentioning

confidence: 99%

“…We also applied global spectral analysis on the congested TA spectra to disentangle the excited-state dynamics of P3HT:PCBM and OPV48: PCBM from SWNTs based on the spectral features from steadystate optical absorption spectroscopy and previous studies ( 35) and ( 37). [36,38] A representative TA spectrum reproduced by the global spectral model is presented in Figure 3c for the OPV48:PCBM sample (see Figure S2, Supporting Information, for the modeled spectrum of the P3HT:PCBM sample).…”

Section: Femtosecond Transient Absorption Spectroscopymentioning

confidence: 99%

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Single‐Walled Carbon Nanotubes as an Additive in Organic Photovoltaics: Effects on Carrier Generation and Recombination Dynamics

et al. 2022

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Employing single‐walled carbon nanotubes (SWNTs) as an additive in the active layer of organic photovoltaics (OPV) to improve charge extraction is gaining weight in the research community. While SWNTs can transport charge carriers orders of magnitudes faster than conventional polymers, they also quench excitons and trap‐free charges, reducing device performance. Such influences of SWNTs on OPV device performance remain inadequately explored and incompletely understood. Herein, the impact of SWNTs, enriched in (6,5) chirality, on the charge generation and extraction properties of two different OPV devices is studied by femtosecond‐microsecond transient absorption spectroscopy and transient photovoltage/photocurrent techniques. It is shown that depending on the donor material properties (e.g., energetics), SWNTs can reduce carrier generation by quenching the excitons and increase carrier recombination through trapping processes. Then, by performing an analytical calculation of the current–voltage characteristics of the devices using the parameters determined via the transient measurements, it is shown that the increased recombination also relates to morphological changes induced by the SWNTs. These results shed light on the performance limiting factors of the SWNTs when incorporated into the active layer of the solar cells. This work thus can accelerate the blend optimization process for high‐performance organic solar cells.

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“…Charges or triplets, for example, are reported to live for nanoseconds. [ 38 ] Figure 3b,e depicts that the amplitude of the

P A_{normals}

and

P A_{normalc}

P A_{normals}

amplitude w/o SWNTs (see Figure S6, Supporting Information), but with SWNTs the decay of

P A_{normalc}

slowed down slightly at high pump intensity (see Figure S7, S8, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Femtosecond Transient Absorption Spectroscopymentioning

confidence: 99%

See 3 more Smart Citations

Single‐Walled Carbon Nanotubes as an Additive in Organic Photovoltaics: Effects on Carrier Generation and Recombination Dynamics

et al. 2022

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Synthesis of Wafer‐Scale Graphene with Chemical Vapor Deposition for Electronic Device Applications

Sun

Pang

Cheng

et al. 2021

Adv Materials Technologies

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The first isolation of graphene opens the avenue for new platforms for physics, electronic engineering, and materials sciences. Among several kinds of synthesis approaches, chemical vapor deposition is most promising for the growth at wafer‐scale, which is compatible with the Si‐based electronic device integration protocols. In this review, the types, properties, and synthesis methods of graphene are first introduced. Many details of wafer‐scale graphene synthesis by chemical vapor deposition strategies are given, including the wafer‐scale single crystal metal and alloy preparation, roll to roll synthesis over Cu, roll to roll electrochemical transfer technique. Besides, the batch‐to‐batch synthesis are highlighted for direct graphene over dielectric substrates such as sapphire and Si/SiO2. The electronic transport and transparent conductance of the wafer‐scale graphene are compared with high‐quality single crystal. The progress and proof‐of‐the‐concept are briefly recalled in graphene‐based electronics such as transistors, sensors, integrated circuits, and spin transport valves. Eventually, the readers are provoked with the current challenges as well as the future opportunities.

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WSe₂ 2D p‐type semiconductor‐based electronic devices for information technology: Design, preparation, and applications

Cheng

Pang

et al. 2020

InfoMat

159

100

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The pioneering exfoliation of monolayer tungsten diselenide has greatly inspired researchers toward semiconducting applications. WSe2 belongs to a family of transition‐metal dichalcogenides. Similar to graphene, WSe2 and analogous dichalcogenides have layered structures with weak van der Waals interactions between two adjacent layers. First, the readers are presented with the fundamentals of WSe2, such as types, morphologies, and properties. Here, we report the characterization principles and practices such as microscopy, spectroscopy, and diffraction. Second, the methods for obtaining high‐quality WSe2, such as exfoliation, hydrothermal and chemical vapor deposition, are briefly listed. With advantages of light weight, flexibility, and high quantum efficiency, 2D materials may have a niche in optoelectronics as building blocks in p‐n junctions. Therefore, we introduce a state‐of‐the‐art demonstration of heterostructure devices employing the p‐type WSe2 semiconductor. The device architectures include field‐effect transistors, photodetectors, gas sensors, and photovoltaic solar cells. Due to its unique electronic, optical, and energy band properties, WSe2 has been increasingly investigated due to the conductivity of the p‐type charge carrier upon palladium contact. Eventually, the dynamic research on WSe2 and van der Waals heterostructures is summarized to arouse the passion of the 2D research community.image

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Chirality Specific Triplet Exciton Dynamics in Highly Enriched (6,5) and (7,5) Carbon Nanotube Networks

Cited by 9 publications

References 50 publications

Single‐Walled Carbon Nanotubes as an Additive in Organic Photovoltaics: Effects on Carrier Generation and Recombination Dynamics

Single‐Walled Carbon Nanotubes as an Additive in Organic Photovoltaics: Effects on Carrier Generation and Recombination Dynamics

Synthesis of Wafer‐Scale Graphene with Chemical Vapor Deposition for Electronic Device Applications

WSe₂ 2D p‐type semiconductor‐based electronic devices for information technology: Design, preparation, and applications

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Chirality Specific Triplet Exciton Dynamics in Highly Enriched (6,5) and (7,5) Carbon Nanotube Networks

Cited by 9 publications

References 50 publications

Single‐Walled Carbon Nanotubes as an Additive in Organic Photovoltaics: Effects on Carrier Generation and Recombination Dynamics

Single‐Walled Carbon Nanotubes as an Additive in Organic Photovoltaics: Effects on Carrier Generation and Recombination Dynamics

Synthesis of Wafer‐Scale Graphene with Chemical Vapor Deposition for Electronic Device Applications

WSe2 2D p‐type semiconductor‐based electronic devices for information technology: Design, preparation, and applications

Contact Info

Product

Resources

About

WSe₂ 2D p‐type semiconductor‐based electronic devices for information technology: Design, preparation, and applications