Organic heterojunctions of phthalocyanine-reduced graphene oxide above percolation threshold for photovoltaic application

Sarkar, Anindya; Rahaman, Abdulla Bin; Chakraborty, Koushik; Pal, Tanusri; Ghosh, Surajit; Banerjee, Dipanwita

doi:10.1016/j.matchemphys.2020.123418

Cited by 9 publications

(3 citation statements)

References 54 publications

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“…As predicted by the general percolation theory, when the occupation probability is below approximately 50% in 2D or 30% in 3D, , there is no way for water diffusion. However, the diffusion becomes possible once the initial nonzero W value exceeds 50% (Figure c,d), which reminds us of the well-documented percolation threshold in 2D. − Such discoveries could also be echoed by the experimental observations, where perovskite stability was enhanced in the presence of moisture when the ion diffusion channel was suppressed, despite the fragile nature of MAPbI 3 in the presence of water . Combining the results of Figure c, it is apparent that the W update or collapse of the perovskite, only accelerates the diffusion, whereas the initial random assignment makes the continuous diffusion possible.…”

Section: Results and Discussionsupporting

confidence: 56%

Hysteresis and Instability Predicted in Moisture Degradation of Perovskite Solar Cells

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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The degradation of the perovskite solar cell structure was expected recently to be reversible, which opened a new gate to the enhancement of the device lifetime by reversing the process. However, the kinetic details of the structural collapse and recovery are still missing, without which the perovskite reversibility cannot be further explored. Due to the experimental difficulty, a purposeful numerical model was conducted in this report, to simulate the water diffusion process in the perovskite structure in both directions. It was found that the moisture diffusion needs to be initiated by a certain level of structural imperfection and is non-Fickian, as assisted by the collapse of the perovskite into the 1D chains. The reversibility was verified by the back diffusion, but accompanied by hysteresis, stagnancy, and even surprising instability, which initiated the water flow under initial equilibrium, due possibly to the imbalance during the reconstruction of the perovskite lattice. These observations offer new insights to form strategies of improvement, for example, via the possible self-healing perovskite devices.

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Section: Results and Discussionsupporting

confidence: 56%

Hysteresis and Instability Predicted in Moisture Degradation of Perovskite Solar Cells

Wang

et al. 2020

ACS Appl. Mater. Interfaces

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“…The observed effects can be explained by the formation of a percolation merged cluster under conditions slightly exceeding the percolation threshold. The technical devices implemented at the percolation threshold are certainly of great interest [48][49][50][51]. In such structures, when interacting with oxygen, the percolation cluster breaks off.…”

Section: Fractal Model Of Porous Sensor Materialsmentioning

confidence: 99%

Impedance Spectroscopy of Hierarchical Porous Nanomaterials Based on por-Si, por-Si Incorporated by Ni and Metal Oxides for Gas Sensors

Bobkov

Лучинин

Мошников

et al. 2022

Sensors

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Approaches are being developed to create composite materials with a fractal-percolation structure based on intercalated porous matrices to increase the sensitivity of adsorption gas sensors. Porous silicon, nickel-containing porous silicon, and zinc oxide have been synthesized as materials for such structures. Using the impedance spectroscopy method, it has been shown that the obtained materials demonstrate high sensitivity to organic solvent vapors and can be used in gas sensors. A model is proposed that explains the high sensitivity and inductive nature of the impedance at low frequencies, considering the structural features and fractal-percolation properties of the obtained oxide materials.

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“…Sarkar et al 24 reported a zinc-tert-butyl phthalocyanine-reduced graphene oxide (ZnTTBPc-rGO) heterojunction as the photoactive layer in a BHJ OSC. In this device, 0.33 vol% rGO content showed a maximum of 1.02% PCE.…”

Section: Incorporatedmentioning

confidence: 99%

Review—State-of-the-Art Organic Solar Cells based on Carbon Nanotubes and Graphene

Wang

Xie

Yeow

2020

ECS J. Solid State Sci. Technol.

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In the 21st century, photovoltaic (PV) is an emerging renewable energy source. According to its low production cost, organic solar cells (OSCs) exhibit huge potential in the commercialization market. Low-dimensional carbon nanomaterials with superb electronic, optical, mechanical properties have been proposed to serve as different functions in organic solar cells. In this paper, we systematically summarize the progress of carbon nanotube (CNT)- and graphene-based OSCs, including the photoactive, electrode and interfacial layers. It concludes that CNTs and graphene can play a crucial role in OSCs. Also, this review provides a summary and outlook on improving the performance of OSCs. At present, the device is in the direction of the hybrid system, high power conversion efficiency (PCE) and long lifetimes.

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Organic heterojunctions of phthalocyanine-reduced graphene oxide above percolation threshold for photovoltaic application

Cited by 9 publications

References 54 publications

Hysteresis and Instability Predicted in Moisture Degradation of Perovskite Solar Cells

Hysteresis and Instability Predicted in Moisture Degradation of Perovskite Solar Cells

Impedance Spectroscopy of Hierarchical Porous Nanomaterials Based on por-Si, por-Si Incorporated by Ni and Metal Oxides for Gas Sensors

Review—State-of-the-Art Organic Solar Cells based on Carbon Nanotubes and Graphene

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