Photodegradation of Organometal Hybrid Perovskite Nanocrystals: Clarifying the Role of Oxygen by Single-Dot Photoluminescence

Luminescent solar concentrator (LSC) is a promising technology to integrate semitransparent photovoltaic (PV) systems into modern buildings and vehicles. Silicon quantum dots (QDs) are good candidates as fluorophores in LSCs, due to the absence of overlap between absorption and emission spectra, high photoluminescence quantum yield (PLQY), good stability, nontoxicity, and element abundance. Herein, LSCs based on Si QDs/polymer nanocomposites are fabricated in a triplex glass configuration. A special polymer matrix (off‐stoichiometric thiol‐ene, OSTE) is used, which improves Si nanocrystal quantum yield. Herein, a comprehensive investigation to improve the performance of LSCs by exploring different strategies under the guidance of a theoretical description is conducted. Among these strategies, the systematical enhancement of PLQY of the nanocomposite is achieved by tuning the thiol/allyl group ratio in the OSTE matrix. In addition, ligand selection and loading optimization for QDs reduce the total scattering loss in the device. Finally, an optical power efficiency of 7.9% is achieved for an optimized LSC prototype (9 × 9 × 0.6 cm3, transmittance ≈62% at 500 nm) based on Si QDs/OSTE nanocomposite, which shows good potential of this material system in LSC fabrication.

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“…It was proven separately that OSTE acts as an effective oxygen barrier for the embedded nanoparticles. [ 13,26 ]…”

Section: Resultsmentioning

confidence: 99%

Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

et al. 2020

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“…As a matter of fact, the crystallinity of the perovskite material increased and the film was adherent to the mesoporous TiO 2 . As demonstrated by timeresolved photoluminescence (PL) spectra, 104,105 the exciton lifetime in PEA-MAPbI 3 was much longer (40 ns) with respect to that in MAPbI 3 (12 ns). PEA-MAPbI 3 also exhibited a stronger absorption than MAPbI 3 in the range 350-800 nm, as shown in Fig.…”

Section: High-temperature Processed Front Electrodesmentioning

confidence: 99%

Carbon-based materials for stable, cheaper and large-scale processable perovskite solar cells

Fagiolari

Bella

2019

Energy Environ. Sci.

247

188

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Almost ten years after their first use in the photovoltaic (PV) field, perovskite solar cells (PSCs) are now hybrid devices that, in addition to having reached silicon performance, can accelerate the energy transition and boost the use of abundant elements for their manufacturing process. However, noble metals (in particular gold) represent the most typically used sources for back electrode fabrication, and this issue has been intensively considered by the research community in the last five years. This review shows how the most promising solution, considering also the need to develop a large-scale production process, is based on the use of carbon-based materials for the preparation of back electrodes. Graphite, carbon black, graphene and carbon nanotubes (CNTs) have been proposed, functionalized and characterized, leading to laboratory-scale solar cells and modules capable of providing excellent efficiencies and ensuring stability greater than those of gold-based devices. Strengthened by these results and its hydrophobizing properties, carbon has also started to be used as an electron transporting material (ETM), with excellent results on both rigid and flexible substrates. This review discusses the major advances and the updated state-of-the-art in the carbon-based PSC scenario, keeping a solid trajectory where the accessibility, low cost, high electrical conductivity, chemical stability and controllable porosity of carbon are highlighted and exploited in the design of upscalable hybrid solar cells. Broader contextToday, more than 75% of the world energy demand is met by traditional, non-sustainable energy resources, mainly based on coal, natural gas and oil. Photovoltaics represents a concrete action to mitigate fossil fuel consumption, and among all the developed solar cells, perovskite-based ones have shown the highest increase in terms of efficiency (currently above 25%). Halide perovskites, as a family of new-generation semiconductor materials, are also exploitable for light-emitting devices, photodetectors and memristors, but their use in photovoltaics gives rise to outstanding performances. Here, photogenerated charges pass through electron/hole transporting materials and are transferred to the external circuit by front and back electrodes. While the front electrode is a common conductive glass, many issues are now under study concerning the back electrode, traditionally made of gold. Indeed, replacing this expensive metal with a much cheaper alternative is vital for realizing affordable solar technologies. Carbon, in its multiple forms, represents the winning solution and the scientific community has recently shown its large scale processability, its power as a stability booster and some interesting effects at the perovskite/electrode interface. This review shows how carbon is becoming the winning ingredient for the scaling up and worldwide diffusion of perovskite solar cells.

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“…Furthermore, single NC PL spectroscopy data suggested that light illumination of MAPbX 3 NCs in oxygen-rich conditions resulted in a blue-shift of the PL maximum owing to the size reduction of NCs by light-induced NC surface etching. [150]…”

Section: Effect Of Light Irradiationmentioning

confidence: 99%

Metal Halide Perovskite@Metal‐Organic Framework Hybrids: Synthesis, Design, Properties, and Applications

Yadav

Grandhi

Dubal

et al. 2020

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FETs), light-emitting diodes (LED), solar cells, water splitting, and water purification owing to their exceptional electronic and optical properties such as extreme absorption coefficient, robust photoluminescence, extended carrier diffusion length, ambipolar charge transport, defect tolerant nature, and similar effective mass value. [1-9] Mitzi et al. reported tin-based perovskites as a new family of semiconductors in 1994. [10] However, real attention was captured only in 2009, when Kojima et al. successfully used them in solar cells as a sensitizer in a dye-sensitized solar cell (DSSC) with the power conversion efficiency (PCE) of 3.8%. [11] Recently, other groups demonstrated halide perovskites as solid-state PSCs with 10% efficiency, which provided considerable impetus for the field, together with the recent spectacular rise in PCE (25.2% certified). [12,13] Apart from solar cells, perovskite halides have been successfully implemented in optoelectronic devices such as FETs and LEDs. [14-17] However, the structural features of perovskites experience swift degradation under different stress conditions such as moisture, UV light, oxygen, and high temperature, which limits their practical applications. [18] This drawback can be tackled by stabilizing halide perovskites by various approaches such as integration of multiple capping agents/stabilizers and encapsulation into various porous materials like polymer matrices, polymethyl Metal halide perovskites (MHPs) have excellent optoelectronic and photovoltaic applications because of their cost-effectiveness, tunable emission, high photoluminescence quantum yields, and excellent charge carrier properties. However, the potential applications of the entire MHP family are facing a major challenge arising from its weak resistance to moisture, polar solvents, temperature, and light exposure. A viable strategy to enhance the stability of MHPs could lie in their incorporation into a porous template. Metal-organic frameworks (MOFs) have outstanding properties, with a unique network of ordered/functional pores, which render them promising for functioning as such a template, accommodating a wide range of MHPs to the nanosized region, alongside minimizing particle aggregation and enhancing the stability of the entrapped species. This review highlights recent advances in design strategies, synthesis, characterization, and properties of various hybrids of MOFs with MHPs. Particular attention is paid to a critical review of the emergence of MHP@MOF for comprehensive studies of next-generation materials for various technological applications including sensors, photocatalysis, encryption/decryption, light-emitting diodes, and solar cells. Finally, by summarizing the state-of-the-art, some promising future applications of reported hybrids are proposed. Considering the inherent correlation and synergic functionalities of MHPs and MOFs, further advancement; new functional materials; and applications can be achieved through designing MHP@MOF hybrids.

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Photodegradation of Organometal Hybrid Perovskite Nanocrystals: Clarifying the Role of Oxygen by Single-Dot Photoluminescence

Cited by 49 publications

References 51 publications

Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

Triplex Glass Laminates with Silicon Quantum Dots for Luminescent Solar Concentrators

Carbon-based materials for stable, cheaper and large-scale processable perovskite solar cells

Metal Halide Perovskite@Metal‐Organic Framework Hybrids: Synthesis, Design, Properties, and Applications

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