Fast P3HT Exciton Dissociation and Absorption Enhancement of Organic Solar Cells by PEG-Functionalized Graphene Quantum Dots

Novak, Travis G.; Kim, Jung Mo; Song, Suhee; Jun, Gwang Hoon; Kim, Hyojung; Jeong, Mun Seok; Jeon, Seungwon

doi:10.1002/smll.201503108

Cited by 59 publications

(29 citation statements)

References 35 publications

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“…The maximum values of PCE (0.40%) and J sc (1.33 mA cm −2 ) were obtained from the binary solar cells with GQDs‐green. Although there is a significant improvement for device efficiency by using GQDs as a sole electron acceptor, it is still lower than the efficiency of classical organic solar cells based on P3HT:PCBM (≈3%) …”

Section: Resultsmentioning

confidence: 94%

“…It could be clearly observed that the HOMO energy levels of all three GQDs match well with those of P3HT (−5.2 eV) and PCBM (−6.1 eV), which can enhance the process of hole transport from PCBM to P3HT. The position of the LUMO energy level of GQDs‐blue is exceed that of P3HT (−3.0 eV), which would inhibit the electron transport from P3HT to GQDs‐blue and also has no benefit to the process of electron transport from P3HT to PCBM . The position of the LUMO energy level of GQDs‐green is between those of P3HT and PCBM, which is benefited to the process of electron transport from P3HT to PCBM.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the optoelectronic properties of GQDs can be tuned by various methods, such as chemical functionalization, chemical/physical reduction, and lateral size variation . In contrast with the complex chemical functionalization and reduction procedures, to regulate the size of GQDs seems more controllable.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Kim et al optimized the performance of ternary solar cell (PTB7:PC 71 BM:GQDs) by regulating the reduction degree of GQDs via hydrothermal reduction method and a PCE improved from 6.70% to 7.60% can be achieved . Novak et al introduced GQDs which have been functionalized with different molecular weights of polyethylene glycol into the active layer of the solar cells (P3HT:PCBM) and gained a PCE improvement of 36% . These works show undoubtedly that the GQDs can influence the performance of the organic solar cells, but how the electron energy states of GQDs, dominated by the lateral dimensions, affect is barely studied.…”

Section: Introductionmentioning

confidence: 99%

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Graphene Quantum Dots Band Structure Tuned by Size for Efficient Organic Solar Cells

Zhang

Shen

et al. 2019

Physica Status Solidi (a)

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The electronic states of graphene quantum dots (GQDs) can be tuned by varying the lateral size and edge structure, which further influence their optoelectronic properties and the applications. Herein, three kinds of GQDs with different lateral size are prepared by photon-Fenton reaction and separated through gel column chromatography, and their effects on the photovoltaic performances of inverted organic solar cells based on the poly(3-hexylthiophene) (P3HT) and poly(3-hexylthiophene)/(6,6)-phenyl-C61 butyric acid methylester (PCBM) blend films are studied systematically. In comparison with P3HT:PCBM cells, the power conversion efficiency of the P3HT:PCBM solar cells containing 0.8% of GQDs-blue, GQDs-green, and GQDs-orange can be increased from 3.06% to 3.54%, 4.43%, and 3.73% with a short-circuit current density of 10.3, 13.34, and 11.19 mA cm À2 . It is illustrated also that the band structures (electronic energy states) tuned mainly by their lateral size of GQDs are the crucial factor to dominate their photovoltaic preferences as additives in conventional P3HT:PCBM solar cells.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Graphene Quantum Dots Band Structure Tuned by Size for Efficient Organic Solar Cells

Zhang

Shen

et al. 2019

Physica Status Solidi (a)

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show abstract

“…In this regard, post-modification is an alternative approach, in which GQDs can be modified by post-processing. 58,[60][61][62][63][64][65][66][67][68] Post-modification allows one to design GQDs with rationally improved properties. Polymer passivation is an often-adopted method to improve the quantum yield of GQDs.…”

Section: Post-modification Of Gqdsmentioning

confidence: 99%

Properties and Synthesis Strategies of Graphene Quantum Dots

Zhang¹,

Lu²

2017

Frontiers in Nanobiomedical Research

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Quantum dots (QDs) are usually referred to as semiconductor nanoparticles with their sizes in the quantum-confined regime, in which the excitons are confined in all the three spatial dimensions. Typical QDs are inorganic semiconductor nanocrystals from the group II-VI elements in the periodic table. However, the applications of these QDs are limited by their internal disadvantages, including intrinsic toxicity (e.g. in the case of widely studied CdSe QDs) and problems caused by the colloidal stability. Therefore, developing new QDs and relevant nanomaterials is necessary. Consequently, graphene quantum dots (GQDs), a class of zero-dimensional (0D) graphitic nanomaterials, have attracted increasing attention recently. Compared with semiconductor QDs, GQDs are superior in terms of low cytotoxicity, high dispersity in water and some polarity organic solvents, resistance to photobleaching and biocompatibility. In addition, the properties of GQDs are easier to be tuned through surface chemistry, indicating that researchers can design GQDs with various functionalities for different applications.

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Complementary n‐Type and p‐Type Graphene Films for High Power Factor Thermoelectric Generators

Novak

Kim

et al. 2020

Adv Funct Materials

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Solution-phase exfoliated graphene has always been an attractive material for flexible thermoelectric applications, but traditional oxidative routes suffer from poor flake quality and a lack of quality doping techniques to make complementary n-type and p-type films. Here, it is demonstrated that by changing the adsorbed surfactant during the intercalation-exfoliation process (polyvinylpyrrolidone for n-type, pyrenebutyric acid for p-type), both extremely high electrical conductivity (3010 and 2330 S cm −1 ) and high Seebeck coefficients (53.1 and −45.5 µV K −1 ) can be achieved. The result is that both of these films show remarkable power factors, over 600 µW m −1 K −2 at room temperature, which is over an order of magnitude better than that in previous works demonstrating complementary n-type and p-type graphene thermoelectric films. Based on these films, a full all-graphene thermoelectric device is constructed as a proof of concept, where a peak power of 5.0 nW is recorded at a temperature difference of 50 K.

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Fast P3HT Exciton Dissociation and Absorption Enhancement of Organic Solar Cells by PEG-Functionalized Graphene Quantum Dots

Cited by 59 publications

References 35 publications

Graphene Quantum Dots Band Structure Tuned by Size for Efficient Organic Solar Cells

Graphene Quantum Dots Band Structure Tuned by Size for Efficient Organic Solar Cells

Properties and Synthesis Strategies of Graphene Quantum Dots

Complementary n‐Type and p‐Type Graphene Films for High Power Factor Thermoelectric Generators

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