Fast degradation of fullerenes by ultraviolet laser radiation

Juha, L.; Krása, J.; Láska, L.; Hamplová, Věra; Soukup, L.; Engst, Pavel; Kubát, Pavel

doi:10.1007/bf00324103

Cited by 19 publications

(11 citation statements)

References 10 publications

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“…Previously published reports indicate that fullerenes are likely to undergo unwanted oxidation when exposed to ultraviolet light or atmospheric ozone. [22][23][24][25] Our STM operates in an airtight, light-free enclosure, and we do not observe any time-dependent differences in images that could be attributed to sample degradation, even for samples that are several days old.…”

Section: Sample Preparationmentioning

confidence: 68%

Structure and dynamics of fullerenes adsorbed on the Au(111) surface

et al. 2004

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Scanning tunneling microscopy was used to characterize the structure of partial monolayers of C 60 and C 70 on the Au(111) surface. Both 3 2 3 2 × R30˚ and 7 × 7 lattice symmetries were observed for C 60 monolayers, in accordance with previous results. For C 70 monolayers, structures are observed with rotation angles of 0˚, 30˚, and 14˚ with respect to the underlying substrate; we propose a previously unreported 13 13 × R13.9˚ lattice structure to explain this last observation. Time sequences of STM images show that while fullerene monolayers are largely stable, molecular motion can be observed on the timescale of minutes or hours. For C 60 , thermal diffusion is the predominant cause of this motion, and STM perturbation of the sample is negligible. In contrast, C 70 is observed to diffuse far more slowly; under normal scanning conditions, tip-induced motion is the major effect.

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Section: Sample Preparationmentioning

confidence: 68%

Structure and dynamics of fullerenes adsorbed on the Au(111) surface

et al. 2004

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“…[ 33–35 ] It has been reported that the UV irradiation of fullerene can give photofragmentation products (C 60 + hv = C 60‐ n + C n ) or a polymeric product (C 60 ) n in previous reports. [ 36–39 ] The Bphen, possessing pyridine ring with lone electron pairs at the N, thus has strong electron donating ability. As a result, the Bphen should interact with fullerene or its derivatives through electron transfer, forming ion pairs C 60 n − /Bphen n + ( n = 1, 2) donor–acceptor system, as shown in Figure 1a.…”

Section: Figurementioning

confidence: 99%

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

et al. 2021

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It is crucial to make perovskite solar cells sustainable and have a stable operation under natural light soaking before they become commercially acceptable. Herein, a small amount of the small molecule bathophenanthroline (Bphen) is introduced into [6,6]‐phenyl‐C61‐butyric acid methyl ester and it is found that Bphen can stabilize the C60‐cage well through formation of much more thermodynamically stable charge‐transfer complexes. Such a strengthened complex is used as an interlayer at the in‐light perovskite/SnO2 side to achieve a champion device with efficiency of 23.09% (certified 22.85%). Most importantly, the stability of the resulting devices can be close to meeting the requirements of the International Electrotechnical Commission 61215 standard under simulated UV preconditioning and light‐soaking testing. They can retain over 95% and 92% of their initial efficiencies after 1100 h UV irradiation and 1000 h continuous illumination of maximum power point tracking at 60 °C, respectively.

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“…2 Despite being extensively used, C 60 is known to degrade by several stress factors. For instance, C 60 degrades under UV light, 3,4 and its consequences at the device level were recently modeled for planar heterojunction solar cells. 5 Similarly, the reduction of carrier mobility 6−9 and conductivity 10−13 upon oxygen exposure of C 60 layers has been reported.…”

Section: Introductionmentioning

confidence: 99%

Oxygen-Induced Degradation in C₆₀-Based Organic Solar Cells: Relation Between Film Properties and Device Performance

Bastos

Voroshazi

Fron

et al. 2016

ACS Appl. Mater. Interfaces

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Fullerene-based molecules are the archetypical electron-accepting materials for organic photovoltaic devices. A detailed knowledge of the degradation mechanisms that occur in C60 layers will aid in the development of more stable organic solar cells. Here, the impact of storage in air on the optical and electrical properties of C60 is studied in thin films and in devices. Atmospheric exposure induces oxygen-trap states that are 0.19 eV below the LUMO of the fullerene C60. Moreover, oxygen causes a 4-fold decrease of the exciton lifetime in C60 layers, resulting in a 40% drop of short-circuit current from optimized planar heterojunction solar cells. The presence of oxygen-trap states increases the saturation current of the device, resulting in a 20% loss of open-circuit voltage. Design guidelines are outlined to improve air stability for fullerene-containing devices.

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Fast degradation of fullerenes by ultraviolet laser radiation

Cited by 19 publications

References 10 publications

Structure and dynamics of fullerenes adsorbed on the Au(111) surface

Structure and dynamics of fullerenes adsorbed on the Au(111) surface

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

Oxygen-Induced Degradation in C₆₀-Based Organic Solar Cells: Relation Between Film Properties and Device Performance

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Fast degradation of fullerenes by ultraviolet laser radiation

Cited by 19 publications

References 10 publications

Structure and dynamics of fullerenes adsorbed on the Au(111) surface

Structure and dynamics of fullerenes adsorbed on the Au(111) surface

Stabilizing Fullerene for Burn‐in‐Free and Stable Perovskite Solar Cells under Ultraviolet Preconditioning and Light Soaking

Oxygen-Induced Degradation in C60-Based Organic Solar Cells: Relation Between Film Properties and Device Performance

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Oxygen-Induced Degradation in C₆₀-Based Organic Solar Cells: Relation Between Film Properties and Device Performance