Orange photoluminescent N-doped graphene quantum dots as an effective co-sensitizer for dye-sensitized solar cells

Jahantigh, Farhad; Ghorashi, Seyed Mohammad Bagher; Mozaffari, Samaneh

doi:10.1007/s10008-020-04515-3

Cited by 28 publications

(9 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…GQD doping can be an intriguing and efficient strategy to further tune their optical and electronic properties when the synthesis is performed. A report from 2020 focused on the synthesis of N-GQDs [ 180 ], which resulted in a homogeneous diameter (ca. 9 nm), good dispersibility, and intense orange luminescence in the visible spectral window, with maximum emission centered at 590 nm.…”

Section: Gqd Applications In Energy-related Applicationsmentioning

confidence: 99%

Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

2021

View full text Add to dashboard Cite

During the last 20 years, the scientific community has shown growing interest towards carbonaceous nanomaterials due to their appealing mechanical, thermal, and optical features, depending on the specific nanoforms. Among these, graphene quantum dots (GQDs) recently emerged as one of the most promising nanomaterials due to their outstanding electrical properties, chemical stability, and intense and tunable photoluminescence, as it is witnessed by a booming number of reported applications, ranging from the biological field to the photovoltaic market. To date, a plethora of synthetic protocols have been investigated to modulate the portfolio of features that GQDs possess and to facilitate the use of these materials for target applications. Considering the number of publications and the rapid evolution of this flourishing field of research, this review aims at providing a broad overview of the most widely established synthetic protocols and offering a detailed review of some specific applications that are attracting researchers’ interest.

show abstract

Section: Gqd Applications In Energy-related Applicationsmentioning

confidence: 99%

Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

2021

View full text Add to dashboard Cite

show abstract

“…The GQD between the TiO2 and N719 restricts the injected electron to recombine back with the redox electrolyte and restricts the electron-hole recombination in the HOMO of N719. Hence, the electron transfers from LUMO of GQD to TiO2 CB is thermodynamically promising [55].…”

Section: Photovoltaic Performancementioning

confidence: 99%

“…Generally, the above factors contribute to the increased in the Jsc and FF of the DSSCs. Recently, Jahantigh et al reported that the presence of amino functional groups on the GQD surface also attracted TiO2 nanocomposite surface structure and therefore leads to better charge injection and improved the DSSCs [55].…”

Section: Photovoltaic Performancementioning

confidence: 99%

New Assembly Method for Cellulose Derived Graphene Quantum Dots-Sensitized Solar Cells

Mahalingam

Lau

Omar

et al. 2021

Preprint

View full text Add to dashboard Cite

Unambiguously layer by layer (LBL) assembly of graphene quantum dots (GQDs) and dye (GQDs/dye) on TiO2 photoanode is the traditional and straightforward approach in the fabrication of graphene quantum dot-sensitized solar cells (QDSSCs). Unfortunately, limited light absorption and low affinity of GQDs to TiO2 surface shadow the advantages of LBL and constrains its practical application. Herein, a new strategy of mixture configuration (GQDs+dye) was investigated. A distinctive nanoporous honeycomb hexagonal carbon network of GQDs was found with fewer defects single crystalline structure, and an average size of 9.87 nm was produced from cellulose. Experimental results demonstrated that LBL exhibited the highest efficiency of 16.76 % under low illumination but a lower efficiency (1.43%) than the mixture method (2.91%) under standard light. The increased Jsc (5.075 mA/cm2) and high charge collection efficiency (0.96) in the mixture sample indicated enhanced electron collection at TiO2. The less -OH groups on TiO2 provides a good surface intact of GQDs and N719. In addition to that, the high surface potential (33.47 mV) of the premixed sample restricted the photogenerated electrons to go into a deep state, reducing back electron transfer. Therefore, mixture assembly of co-sensitization is an effective approach for light-harvesting in QDSSC.

show abstract

“…Majumder and Mondal, 32 also fabricated DSSCs with PCEs of 0.13, 0.25 and 0.29% for the GQD, N-GQD, and sulfur-nitrogen co-doped GQD (SN-GQD) photosensitizers, respectively. This was improved by Jahantigh et al 128 and Yang et al, 129 who respectively incorporated N-GQDs and oxygen functionalized GQDs into the N719 dye, as illustrated in Fig. 8.…”

Section: Photosensitizermentioning

confidence: 99%

“…8. This resulted in an increase in PCE from 5.72% for the devices based on pristine N719 dye, to 7.49% for the N-GQD/N719-based DSSCs, 128 and from 7.6% for the N719 dye devices, to 8.9% for the GQD/N719-based DSSCs. 129 Besides producing a signicant increase in device performance, the GQDs reduced the quantity of the N719 dye used, which reduced the cost and environmental impact, thus, revealing the potential of GQDs as promising metal-free and 'green' alternatives to the ruthenium-based dyes in DSSCs.…”

Section: Photosensitizermentioning

confidence: 99%

Recent advances in graphene-based materials for dye-sensitized solar cell fabrication

2020

View full text Add to dashboard Cite

show abstract

Orange photoluminescent N-doped graphene quantum dots as an effective co-sensitizer for dye-sensitized solar cells

Cited by 28 publications

References 33 publications

Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

Shedding Light on Graphene Quantum Dots: Key Synthetic Strategies, Characterization Tools, and Cutting-Edge Applications

New Assembly Method for Cellulose Derived Graphene Quantum Dots-Sensitized Solar Cells

Recent advances in graphene-based materials for dye-sensitized solar cell fabrication

Contact Info

Product

Resources

About