ZnO/Graphene Quantum Dot Solid-State Solar Cell

Dutta, Mrinal; Sarkar, Sanjit; Ghosh, Tushar K.; Basak, Durga

doi:10.1021/jp302992k

Cited by 205 publications

(122 citation statements)

References 67 publications

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“…[18] In addition, the related graphene quantum dots have been used as sensitizers in ZnO nanorod-based solar cells, but this carbon material was produced using top-down methods. [19] Such nanostructured solar cells have the potential to be produced at significantly lower costs than traditional silicon and thin-film photovoltaics because the use of a high surface area scaffold, most commonly TiO 2 or ZnO, reduces the required absorber thickness. [20] The most common such device is the dye-sensitized solar cell, which uses TiO 2 sensitized with a ruthenium-based dye.…”

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confidence: 99%

Biomass‐Derived Carbon Quantum Dot Sensitizers for Solid‐State Nanostructured Solar Cells

et al. 2015

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New hybrid materials consisting of ZnO nanorods sensitized with three different biomass-derived carbon quantum dots (CQDs) were synthesized, characterized, and used for the first time to build solid-state nanostructured solar cells. The performance of the devices was dependent on the functional groups found on the CQDs. The highest efficiency was obtained using a layer-by-layer coating of two different types of CQDs.

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confidence: 99%

Biomass‐Derived Carbon Quantum Dot Sensitizers for Solid‐State Nanostructured Solar Cells

et al. 2015

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“…[16][17][18] Indeed, several studies have shown that the principle of using such materials as sensitizers in mesoscopic solar cells is sound, although the reported power conversion efficiencies cannot yet compete with inorganic QD solar cells. [19][20][21][22][23][24] We here classify GQDs as structurally well-defined, carbonrich organic molecules that generally require multi-step synthetic procedures in contrast to CNDs, which are usually synthesized in a single step but do not exhibit a well-defined molecular structure. This differentiation is, however, not universally accepted in the literature, where the terms graphene quantum dot, carbon nanodot and carbon dot are often used interchangeably.…”

Section: Conceptual Insightsmentioning

confidence: 99%

Using carbon nanodots as inexpensive and environmentally friendly sensitizers in mesoscopic solar cells

et al. 2016

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Showcasing research from the Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) GermanyUsing carbon nanodots as inexpensive and environmentally friendly sensitizers in mesoscopic solar cells Carbon nanodots (CNDs) have attracted a lot of attention due to their superior optical properties and low environmental impact. The successful incorporation of this nanomaterial in optoelectronic devices is still an open challenge however, mainly because of CNDs' heterogeneous electronic and chemical structures. A comprehensive investigation based on device characterization, spectroscopy and theory now reveals that the performance of CND solar cells is limited by a trade-off between light absorption, electronic trap states and charge regeneration kinetics.rsc.li/nanoscale-horizons Comprehensive spectroscopic and theoretical studies allow us to rationalize the nature of their absorption features. Promising power conversion efficiencies (g) of 0.24% can be achieved from these cheap and eco-friendly sensitizers by optimizing the solar-cell assembly process. Interestingly, we found that extending the light absorption towards longer wavelengths does not necessarily improve the performance of the solar cells, since the longer-wavelength absorption features hardly contribute to the cells' photo-action spectra, so that the overall power conversion efficiency is actually worse. The origin of the lower performance is corroborated in transient absorption spectroscopy and photovoltage decay measurements. Our work points, on one hand, to the limits of as-synthesized CNDs as photosensitizers and, on the other hand, to possible improvements.

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“…10.6b) is extended from 400 to 700 nm while that for MB-GQDs (475-700 nm) is narrow and extended from 475 to 700 nm (centered at 525 nm), giving green luminescence [21]. The PL emission spectra Dutta et al [25] synthesized GQDs by a direct chemical method and in combination with ZnO nanowires. Figure 10.8a shows the microstructure and size distribution of the synthesized GQDs as observed by the TEM.…”

Section: Solar Cell Devicesmentioning

confidence: 99%

“…The maximum of the emission band shifts toward the higher wavelength side as the excitation wavelength is increased from 280 to 420 nm while the intensity decreases rapidly. According to Dutta et al [25], the evolution of the luminescence behavior with a change in the excitation energy is due to the fact that the band gap in these QDs depends on the size and shapes of the sp 2 domains that result from the size distribution of the GQDs. When these GQDs are combined with ZnO NWs, the emission from these QDs is quenched fully in the visible region (Fig.…”

Section: Solar Cell Devicesmentioning

confidence: 99%

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Graphene Quantum Dot-Based Organic Solar Cells

Gupta¹,

Upreti²,

Chand³

2013

Lecture Notes in Nanoscale Science and Technology

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Current research in organic photovoltaic (OPV) is largely focused on the development of low cost OPV materials such as semiconductor quantum dots (QDs). Graphene quantum dots (GQDs) are a fascinating class of QDs having size below 10 nm. They have emerged as an alternative to semiconductor QDs in photovoltaics due to their size-dependent photoluminescence (PL) and tunable band gap properties. They are expected to be a versatile candidate due to their low cost, non-toxicity, and biocompatibility. Recently, it has been shown that they are promising for efficient light harvesting in solar cells. Keeping this in view, we present a comprehensive review of the progress made so far for the application of GQDs in organic solar cells. IntroductionGraphene is a two-dimensional sheet of sp 2 -hybridized carbon. Its extended honeycomb network can be stacked to form a 3D graphite, 1D nanotube, and 0D fullerenes. Discovered by Novoselov and his group in 2004 [1], it is considered to be one of the most promising materials for the future nanotechnology owing to its low cost coupled with the superior electronic, thermal, and mechanical properties as well as an enhanced chemical stability. The most exciting characteristics are ambipolar field effect [1], the quantum Hall effect [2][3][4][5][6][7], and extremely high carrier mobility [8][9][10][11] that can find several applications including in optoelectronic devices. The use of graphene sheets (GSs) in the solar cell devices is possible due to the efficient charge transfer in graphene. However, the zero band gap in graphene imposes limitations for optoelectronic applications, since a finite band gap is

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ZnO/Graphene Quantum Dot Solid-State Solar Cell

Cited by 205 publications

References 67 publications

Biomass‐Derived Carbon Quantum Dot Sensitizers for Solid‐State Nanostructured Solar Cells

Biomass‐Derived Carbon Quantum Dot Sensitizers for Solid‐State Nanostructured Solar Cells

Using carbon nanodots as inexpensive and environmentally friendly sensitizers in mesoscopic solar cells

Graphene Quantum Dot-Based Organic Solar Cells

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