Solvent-engineered performance improvement of graphene quantum dot sensitized solar cells with nitrogen functionalized GQD photosensitizers

Dey, Tamal; Ghorai, Arup; Das, Soumen; Ray, S. K.

doi:10.1016/j.solener.2022.02.048

Cited by 26 publications

(15 citation statements)

References 52 publications

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“…The JCPDS card number for PbS is 05-0592, and for PbSe, the JCPDS card number is 06-0354. 51 Amorphous-doped GQDs do not show any sharp XRD peaks 55 and do not have standard JCPDS entry. PbS and PbSe dominate the XRD patterns due to the low crystallinity of the doped GQDs and the high X-ray scattering cross section in the PbS and PbSe due to the high density of electrons in heavier elements.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

X-Graphene Quantum Dot/PbX (X = S, Se) Hybrid Nanostructures for Self-Powered Two-Color UV-NIR Photodetectors

Dey,

Singh,

Jana

et al. 2023

ACS Appl. Nano Mater.

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Self-powered near-infrared (NIR) photodetectors are crucial in various practical applications. In this study, we present the development of two different UV-NIR dual-absorbing nanostructures: (i) composite of sulfur-doped graphene quantum dots (S-GQD) and lead sulfide (PbS), denoted as S-GQD/PbS and (ii) composite of selenium-doped graphene quantum dots (Se-GQD) and lead selenide (PbSe), denoted as Se-GQD/PbSe. These nanostructures were synthesized by using a two-step solvothermal method. The photodetectors fabricated using these nanocomposites can operate over a wide wavelength range, from 400 to 1800 nm, and under zero-bias conditions, a peak NIR responsivity of 1.8 A/W is noted. This result marks the development of superior self-powered NIR photodetectors using colloidal quantum dots. Additionally, these devices exhibit superior performance near UV−visible wavelengths, exhibiting a peak responsivity of 2.5 A/W, demonstrating their potential as highperforming dual-band self-powered colloidal quantum dot-based photodetectors.

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Section: ■ Results and Discussionmentioning

confidence: 99%

X-Graphene Quantum Dot/PbX (X = S, Se) Hybrid Nanostructures for Self-Powered Two-Color UV-NIR Photodetectors

Dey,

Singh,

Jana

et al. 2023

ACS Appl. Nano Mater.

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“…Photosensitizer QDSSCs [ 225] Glass/FTO/GQDs adsorbed by TiO 2 layer/Pt-counter electrode/FTO 5.3 2022…”

Section: Solar Cellsmentioning

confidence: 99%

“…Several studies have explored the use of GQDs as photosensitizers in quantum dot-sensitized solar cells (QDSSCs). [225,226] Dey and colleagues reported that the choice of reaction solvent (e.g., water and DMF) for the preparation of N-GQDs (water: G-GQDs; DMF: R-GQDs) dramatically affects their structural, photophysical, and electronic properties. [225] Spectroscopic results revealed that DMF a polar aprotic solvent facilitated the formation of extended 𝜋-conjugation, resulting in a higher absorption coefficient and charge carrier mobility.…”

Section: Solar Cellsmentioning

confidence: 99%

From Pristine to Heteroatom‐Doped Graphene Quantum Dots: An Essential Review and Prospects for Future Research

Kim

Hyeong

et al. 2023

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Graphene quantum dots (GQDs) are carbon‐based zero‐dimensional materials that have received considerable scientific interest due to their exceptional optical, electrical, and optoelectrical properties. Their unique electronic band structures, influenced by quantum confinement and edge effects, differentiate the physical and optical characteristics of GQDs from other carbon nanostructures. Additionally, GQDs can be synthesized using various top‐down and bottom‐up approaches, distinguishing them from other carbon nanomaterials. This review discusses recent advancements in GQD research, focusing on their synthesis and functionalization for potential applications. Particularly, various methods for synthesizing functionalized GQDs using different doping routes are comprehensively reviewed. Based on previous reports, current challenges and future directions for GQDs research are discussed in detail herein.

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“…27 Although PEI-functionalized GQDs (PEI-GQDs) seem to be more preferred in research on biological applications, it has been observed that PEI-GQDs are also used in organic tandem solar cells and improve the performance of the device. 28 Tamal et al 29 investigated the photovoltaic performance of N-GQDs. So far, studies with PEI-GQDs for electronic applications seem limited.…”

Section: Introductionmentioning

confidence: 99%

Negative Capacitance Behavior at Low Frequencies of Nitrogen-Doped Polyethylenimine-Functionalized Graphene Quantum Dots-Based Structure

Berktaş

Orhan

Ulusoy

et al. 2023

ACS Appl. Electron. Mater.

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Graphene quantum dots (GQDs), zero-dimensional members of the carbon family, have exceptional mechanical, thermal, and electrical properties. Nevertheless, pure GQDs have many challenges in reaching their full potential in electronic applications. Functionalizing or chemical modification of GQDs adjusts the physical and chemical properties, driving GQDs toward high-performance device applications. Nitrogen (N)-doped polyethylenimine (PEI) functionalized GQDs are capturing the interest of researchers specifically for electronic and photovoltaic applications these days. In this context, we present for the first time capacitance/conductance−voltage (C−V and G/ω−V) measurements of the nitrogen-doped PEI-functionalized GQDs-based structure for use in electronic applications in the frequency range from 1 kHz to 2 MHz at 300 K in this study. Capacitance features, the energy density distribution of surface states (N ss ), and the relaxation time (τ) of a nitrogen-doped PEI-functionalized GQDs-based structure have been examined by using the admittance/conductance method. Negative capacitance (NC) behavior mostly exhibited by ferroelectric materials has been observed in the GQDs-based structure at low frequencies, and then it starts to disappear. NC is usually attributed to various surface states/interface traps, series resistance (R s ), and minority carrier injection. The NC phenomenon indicates that an increase in voltage gives rise to a decrease in the charge on the electrodes. The control of interfacial charges in such a heterostructure will be critical for NC devices. The results provide a basis for insights into semiconductor device technology.

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Solvent-engineered performance improvement of graphene quantum dot sensitized solar cells with nitrogen functionalized GQD photosensitizers

Cited by 26 publications

References 52 publications

X-Graphene Quantum Dot/PbX (X = S, Se) Hybrid Nanostructures for Self-Powered Two-Color UV-NIR Photodetectors

X-Graphene Quantum Dot/PbX (X = S, Se) Hybrid Nanostructures for Self-Powered Two-Color UV-NIR Photodetectors

From Pristine to Heteroatom‐Doped Graphene Quantum Dots: An Essential Review and Prospects for Future Research

Negative Capacitance Behavior at Low Frequencies of Nitrogen-Doped Polyethylenimine-Functionalized Graphene Quantum Dots-Based Structure

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