X-ray microtomography of the carbonation front shape evolution of cement mortar and modeling of accelerated carbonation reaction

Han, Jie; Sun, Wei; Pan, Ganghua

doi:10.1007/s11595-013-0683-8

Cited by 25 publications

(25 citation statements)

References 17 publications

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“…The broad O 1s signal can be consistently decomposed into three different oxygen species, which, according to the literature, can be assigned to Pb(OH) 2 at 532.6 eV, PbCO 3 at 531.1 eV and PbO at 529.3 eV. [24][25][26][27] The nding of PbCO 3 in the O 1s spectrum is in excellent agreement with the carbonate peak in the C 1s spectrum. In summary, we conclude that upon photoinduced degradation in air, CH 3 NH 3 PbI 3 decomposes into lead salts (e.g.…”

Section: 16supporting

confidence: 69%

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Photoinduced degradation of methylammonium lead triiodide perovskite semiconductors

et al. 2016

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Photoinduced degradation is a critical obstacle for the real application of novel semiconductors for photovoltaic applications. In this paper, the photoinduced degradation of CH 3 to its role in creating ion vacancies. The degradation in air suggests that both oxygen and water contribute to the fast photodecomposition of CH 3 NH 3 PbI 3 into lead salts rather than water alone. Given these basic yet fundamental understandings, the design of hydrophobic capping layers becomes one prerequisite towards long-term stable perovskite-based devices.

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Section: 16supporting

confidence: 69%

“…In addition, a novel peak at the binding energy of 289.1 eV arises, which corresponds to carbonate species. 24 This peak thus suggests the formation of PbCO 3 during the degradation in air/light. Furthermore, the O 1s spectrum (Fig.…”

Section: 16mentioning

confidence: 93%

Photoinduced degradation of methylammonium lead triiodide perovskite semiconductors

et al. 2016

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“…Another pair is the 137.8 and 142.7 eV peaks, which are the 4f 7/2 and 4f 5/2 peaks for PbO, respectively. 51 It is likely that the dendrites in Figure 5 were from PbO. Figure 6(B) shows the ratio of PbO to CH 3 NH 3 PbI 3 /PbI 2 according to Figure 6(A).…”

Section: Journal Of the American Chemical Societymentioning

confidence: 98%

Unveiling the Role of tBP–LiTFSI Complexes in Perovskite Solar Cells

et al. 2018

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Lead halide-based perovskite materials have been applied as an intrinsic layer for next-generation photovoltaic devices. However, the stability and performance reproducibility of perovskite solar cells (PSCs) needs to be further improved to match that of silicon photovoltaic devices before they can be commercialized. One of the major bottlenecks that hinders the improvement of device stability/reproducibility is the additives in the hole-transport layer, lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) and 4-tert-butylpyridine (tBP). Despite the positive effects of these hole-transport layer additives, LiTFSI is hygroscopic and can adsorb moisture to accelerate the perovskite decomposition. On the other hand, tBP, the only liquid component in PSCs, which evaporates easily, is corrosive to perovskite materials. Since 2012, the empirical molar ratio 6:1 tBP:LiTFSI has been wildly applied in PSCs without further concerns. In this study, the formation of tBP−LiTFSI complexes at various molar ratios has been discovered and investigated thoroughly. These complexes in PSCs can alleviate the negative effects (decomposition and corrosion) of individual components tBP and LiTFSI while maintaining their positive effects on perovskite materials. Consequently, a minor change in tBP:LiTFSI ratio results in huge influences on the stability of perovskite. Due to the existence of uncomplexed tBP in the 6:1 tBP:LiTFSI mixture, this empirical tBP−LiTFSI molar ratio has been demonstrated not as the ideal ratio in PSCs. Instead, the 4:1 tBP:LiTFSI mixture, in which all components are complexed, shows all positive effects of the hole-transport layer components with dramatically reduced negative effects. It minimizes the hygroscopicity of LiTFSI, while lowering the evaporation speed and corrosive effect of tBP. As a result, the PSCs fabricated with this tBP:LiTFSI ratio have the highest average device efficiency and obviously decreased efficiency variation with enhanced device stability, which is proposed as the golden ratio in PSCs. Our understanding of interactions between hole-transport layer additives and perovskite on a molecular level shows the pathway to further improve the PSCs' stability and performance reproducibility to make them a step closer to large-scale manufacturing.

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“…93,94 Further irreversible decompositions present the separate appearance of porous and distorted hexagonal PbI 2 platelets in the film. 95,96 Given that the working PSCs in actual situations are contemporaneously under direct exposure to light, heat, water etc., the coupled effects of moisture with other environmental factors on MAPbI 3 should also be considered. Studies presented that the cooperative effects of water with light, ambient air and high temperature would aggravate the water-induced influence.…”

Section: Effect Of H 2 O On Perovskite Compositionmentioning

confidence: 99%

Impact of H₂O on organic–inorganic hybrid perovskite solar cells

Huang

Tan

Lund

et al. 2017

Energy Environ. Sci.

412

358

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X-ray microtomography of the carbonation front shape evolution of cement mortar and modeling of accelerated carbonation reaction

Cited by 25 publications

References 17 publications

Photoinduced degradation of methylammonium lead triiodide perovskite semiconductors

Photoinduced degradation of methylammonium lead triiodide perovskite semiconductors

Unveiling the Role of tBP–LiTFSI Complexes in Perovskite Solar Cells

Impact of H₂O on organic–inorganic hybrid perovskite solar cells

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X-ray microtomography of the carbonation front shape evolution of cement mortar and modeling of accelerated carbonation reaction

Cited by 25 publications

References 17 publications

Photoinduced degradation of methylammonium lead triiodide perovskite semiconductors

Photoinduced degradation of methylammonium lead triiodide perovskite semiconductors

Unveiling the Role of tBP–LiTFSI Complexes in Perovskite Solar Cells

Impact of H2O on organic–inorganic hybrid perovskite solar cells

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Product

Resources

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Impact of H₂O on organic–inorganic hybrid perovskite solar cells