Photoactive Porphyrin‐Based Metal‐Organic Framework Nanosheets

Liu, Chenxi; Wang, Chiming; Wang, Hailong; Wang, Tianyu; Jiang, Jianzhuang

doi:10.1002/ejic.201900940

Cited by 16 publications

(14 citation statements)

References 59 publications

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“…55 In another recent study, porphyrin based MON lms were formed on ITO using a Langmuir-Blodgett approach and impregnated with C 60 to form a liquid junction solar cell with quantum efficiency less than 0.1%. 56 To-date, there have been no-reports of the use of MONs or more generally MOFs within the active layer of bulk-heterojunction OPV devices.…”

Section: Introductionmentioning

confidence: 99%

Metal–organic framework nanosheets for enhanced performance of organic photovoltaic cells

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Metal–organic framework nanosheets for enhanced performance of organic photovoltaic cells

et al. 2020

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“…The high surface area and porous structure of the photoactive MONs enhanced charge transfer to the electron accepting fullerenes resulting in a quantum efficiency of <0.5% (Figure 12b). [177] A study published by our group is the first example showing incorporation of MONs into the photoactive layer of OPV bulk heterojunctions (Figure 12c,d). [178] Porphyrin MONs as a ternary blend within the archetypal P3HT-PCBM architecture resulted in the formation of a ternary blend solar cell which showed a doubling in device power conversion efficiency (PCE).…”

Section: Mof Nanosheets In Photovoltaic Devicesmentioning

confidence: 97%

Section: Perspectivementioning

confidence: 99%

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Metal–Organic Framework Nanosheets: Programmable 2D Materials for Catalysis, Sensing, Electronics, and Separation Applications

Nicks¹,

Sasitharan²,

Prasad³

et al. 2021

Adv Funct Materials

115

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offers advantages over simple inorganic nanosheets in that a diverse range of physical and chemical properties can be programmed into their crystalline structure (Figure 1). This distinct combination of properties makes MONs ideal for a wide range of catalysis, sensing, electronics, and separation applications which will be the focus of this review.Much of the early literature in this field focused on the development of novel MON architectures and new routes towards their synthesis. A diverse range of different metal ions and organic linkers have been used to construct MONs. [4] However the field has rapidly converged on a handful of popular secondary building units (SBUs) which dominate much of the literature thanks to their reliable formation of high aspect ratio nanosheets. Popular classes of MONs that have been widely applied by different groups in applications include those based on the metal paddlewheel (PW) motif, [5][6][7] axially capped Zr and Hf clusters, [8][9][10][11] 2D zeolitic imidazolate frameworks (ZIFs), [12][13][14] and square planar Ni, Co, and Cu SBUs. [15][16][17][18] The modular structure of MONs, ease of functionalization and diverse range of materials they can be combined with means that MONs can be readily "programmed" to provide the desired topology and properties required for a given application.A wide variety of methods have been explored to synthesize MONs, either "top-down" by the exfoliation of layered metalorganic frameworks (MOFs) or "bottom-up" by assembly of molecular building blocks directly into nanosheets. The majority of top-down approaches utilize mechanical energy to overcome inter-layer interactions, such as liquid-assisted ultrasonication, [19] shear-mixing, [20] and grinding/ball-milling, [13] or the less common freeze-thaw [21] and "scotch-tape" methods. [22,23] Other methods involving photochemical, [24] electrochemical, [25] and chemical intercalation, [26] have also been developed but are less widely used. Bottom-up methodologies typically utilize surfactants or modulators to inhibit crystal growth in one dimension, [12,27,28] or layering/interfacial methods to promote anisotropic growth. [15,29,30] The use of sacrificial 2D templates has also recently emerged a promising route. [31,32] Each approach has advantages and disadvantages in terms of the thickness, lateral dimensions, size distribution, quantity and quality of the MONs produced, and the best approach therefore varies depending on the application.

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“…[34] Liu et al used a Langmuir-Blodgett approach to deposit a film of porphyrin based MONs onto ITO and infilled them with C 60 to form a liquid junction solar cell. [35] Most recently, A.K.Y Jen and co-workers demonstrated the use of MONs as an electron extraction layer at the perovskite/cathode interface reducing the leakage of toxic lead ions and so improving device stability. [36] We recently reported the first example showing incorporation of MONs into the photoactive layer of OPV BHJs.…”

Section: Introductionmentioning

confidence: 99%

Metal‐Organic Framework Nanosheets as Templates to Enhance Performance in Semi‐Crystalline Organic Photovoltaic Cells

et al. 2022

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Optimizing the orientation, crystallinity, and domain size of components within organic photovoltaic (OPV) devices is key to maximizing their performance. Here a broadly applicable approach for enhancing the morphology of bulk heterojunction OPV devices using metal-organic nanosheets (MONs) as additives is demonstrated. It is shown that addition of porphyrin-based MONs to devices with fully amorphous donor polymers lead to small improvements in performance attributed to increased light absorption due to nanosheets. However, devices based on semi-crystalline polymers show remarkable improvements in power conversion efficiency (PCE), more than doubling in some cases compared to reference devices without nanosheets. In particular, this approach led to the development of PffBT4T2OD-MON-PCBM device with a PCE of 12.3%, which to the authors' knowledge is the highest performing fullerene based OPV device reported in literature to date. Detailed analysis of these devices shows that the presence of the nanosheets results in a higher fraction of face-on oriented polymer crystals in the films. These results therefore demonstrate the potential of this highly tunable class of two-dimensional nanomaterials as additives for enhancing the morphology, and therefore performance, of semi-crystalline organic electronic devices.

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Photoactive Porphyrin‐Based Metal‐Organic Framework Nanosheets

Cited by 16 publications

References 59 publications

Metal–organic framework nanosheets for enhanced performance of organic photovoltaic cells

Metal–organic framework nanosheets for enhanced performance of organic photovoltaic cells

Metal–Organic Framework Nanosheets: Programmable 2D Materials for Catalysis, Sensing, Electronics, and Separation Applications

Metal‐Organic Framework Nanosheets as Templates to Enhance Performance in Semi‐Crystalline Organic Photovoltaic Cells

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