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Гаврилин, М. В.; Sen’chukova, G. V.; Kompantseva, E. V.

doi:10.1023/a:1005298426614

Cited by 10 publications

(7 citation statements)

References 4 publications

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“…It does not take much Sn 4+ doping (<0.1%) in ASnI 3 perovskites to turn the material's p-type conductors and render them inactive as solar photovoltaic absorbers. 1 H NMR measurements of the corresponding solutions revealed the presence of DMS (at 2.07 ppm) 11 even after 10 min of heat treatment at 120 °C (Figure 2a,b). Longer heat treatment led to more DMS formation (Figure S1).…”

mentioning

confidence: 78%

“…Recently, Hamill et al showed that DMSO induces the conversion of methylammonium into dimethylammonium cation in CH 3 NH 3 I + PbI 2 solutions at 150 °C. 12 DMSO is also known as an oxidation agent for Sn(II) in acidic medium; 11 given that perovskite organic cations are Lewis acids, we hypothesized that DMSO can oxidize Sn(II) in perovskite solutions.…”

mentioning

confidence: 98%

“…1 H NMR measurements of the corresponding solutions revealed the presence of DMS (at 2.07 ppm) even after 10 min of heat treatment at 120 °C (Figure a,b). Longer heat treatment led to more DMS formation (Figure S1).…”

mentioning

confidence: 99%

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Conventional Solvent Oxidizes Sn(II) in Perovskite Inks

et al. 2020

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confidence: 78%

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confidence: 98%

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Conventional Solvent Oxidizes Sn(II) in Perovskite Inks

et al. 2020

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“…This further evidences the stabilization of SnI 2 by the added DMSO, and tells that Sn(IV) in the precursor mainly originates from the oxidation of Sn 2+ ions but not undissociated SnI 2 . This is surprising since DMSO, as a well-known oxidant, [49] is naturally expect to easily oxidize Sn(II) into Sn(IV). [19,46] A rational mechanism is that the Sn(II)-to-Sn(IV) oxidation in the precursor requires the dissociation of SnI 2 into free ions first, while complexing SnI 2 can effectively enlarge the dissociation barrier.…”

Section: Sni 2 Dissociation and Sn 2+ Oxidation In The Precursormentioning

confidence: 99%

Stability Improvement of Tin‐Based Halide Perovskite by Precursor‐Solution Regulation with Dual‐Functional Reagents

Cao

Dong

et al. 2021

Adv Funct Materials

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Tin‐based halide perovskites have attracted great attention in the perovskite solar cells (PSCs) community with their suitable band gaps, excellent optoelectronic properties, and non‐toxicity. However, because of their poor chemical stability, it is challenging to fabricate highly stable and efficient tin PSCs (TPSCs). In this study, the origin of the Sn2+ oxidation ahead of film formation is concentrated on, and it is found that the ionization of SnI2 in precursor plays a decisive role. Accordingly, SnI2 dissociation and the subsequent Sn2+ oxidation can be restricted in precursor by employing reductive complexes as additives. This dual‐functional source‐regulating strategy effectively helps prepare high‐quality perovskite films with low Sn4+ defect densities. As a result, the unencapsulated TPSCs show a considerable power‐conversion efficiency of 10.03% (certified 9.38%) and maintain 90% of its initial efficiency after 1000 h of light aging testing.

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“…The peak at 2.07 ppm is assigned to the methyl protons of dimethylsulfide (DMS), which is the product of the irreversible redox reaction of Sn(II) and DMSO. [ 22 ] This signal appeared in SnI 2 alone and mixed PbI 2 /SnI 2 solutions while no sign for other solutions. To further exclude the effect of other precursor solutes, the CsI and FAI with molar ratio of 1:3 was added in each group.…”

Section: Resultsmentioning

confidence: 99%

DMSO‐Free Solvent Strategy for Stable and Efficient Methylammonium‐Free Sn–Pb Alloyed Perovskite Solar Cells

Zhang

Liang

Wang

et al. 2023

Advanced Energy Materials

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Harmful Sn(IV) vacancies and uncontrolled fast crystallization commonly occur in tin–lead alloyed perovskite films. The typical dimethyl sulfoxide (DMSO) processing solvent is suggested to be the primary source of problems. Here, a DMSO‐free solvent strategy is demonstrated to obtain high‐performance Cs0.25FA0.75Pb0.5Sn0.5I3 solar cells. A rational solvent selection process via Hansen solubility parameters and Gutmann's donor number shows that N,N′‐dimethylpropyleneurea (DMPU) has a strong coordinate ability to form complete complexation with organic (formamidinium iodide) and inorganic (CsI, PbI2, and SnI2) components. This treatment suppresses the iodoplumbate (PbIn2‐n) or iodostannate (SnIn2‐n) preformed in precursor solution, thereby promoting pure intermediate complexes and retarding crystallization, realizing enlarged grain size, and improved film crystallinity. Additionally, it is demonstrated that DMPU‐based solvent system can further inhibit the oxidation of Sn(II) and reduced Sn(IV) content by nearly 75% due to its superior thermal and chemical stability. This DMSO‐free strategy generates a record efficiency of 22.41%, with a Voc of 0.88 V and a FF of 82.72% for the MA‐free Sn–Pb alloyed device. The unencapsulated devices display much‐improved humidity stability at 30 ± 5% relative humidity in air for 240 h, impressive thermal stability at 85 °C for 500 h, and promote continuous operation stability at maximum power point for 150 h.

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Cited by 10 publications

References 4 publications

Conventional Solvent Oxidizes Sn(II) in Perovskite Inks

Conventional Solvent Oxidizes Sn(II) in Perovskite Inks

Stability Improvement of Tin‐Based Halide Perovskite by Precursor‐Solution Regulation with Dual‐Functional Reagents

DMSO‐Free Solvent Strategy for Stable and Efficient Methylammonium‐Free Sn–Pb Alloyed Perovskite Solar Cells

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