Fluoridchemie in Zinn‐Halogenid‐Perowskiten

Pascual, Jorge; Flatken, Marion; Félix, Roberto; Li, Guixiang; Turren‐Cruz, Silver‐Hamill; Aldamasy, Mahmoud H.; Hartmann, Claudia; Li, Meng; Girolamo, Diego Di; Nasti, Giuseppe; Hüsam, Elif; Wilks, Regan G.; Dallmann, André; Bär, Marcus; Hoell, Armin; Abate, Antonio

doi:10.1002/ange.202107599

Cited by 16 publications

(11 citation statements)

References 47 publications

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“…[ 24–26 ] On the other hand, the specific peak of SnF 2 shifts from −87 to −147 ppm in the 19 F NMR spectrum (Figure 1d) and moves from −630 to −765 ppm in the 119 Sn NMR spectra (Figure 1e), indicating SnF 2 has been reacted and formed new tin‐complexes. [ 27,28 ] These NMR spectra confirm the basic SnF 2 can react with matter owns ‐SO 3 H group, and suggest the interface between PEDOT:PSS and NBG perovskite containing SnF 2 are not stable from a long term perspective.…”

Section: Resultsmentioning

confidence: 86%

Acidity Control of Interface for Improving Stability of All‐Perovskite Tandem Solar Cells

Zhou

Qiu

Wen

et al. 2023

Advanced Energy Materials

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Developing all‐perovskite tandem solar cells has been proved to be an effective approach to boost the efficiency beyond the Shockley–Queisser limit. However, the Sn‐based narrow‐bandgap (NBG) perovskite solar cells (PSCs) suffer from the relatively low photostability, which limits their further application in all‐perovskite tandem solar cells. In this work, the instability of NBG PSCs is found to come from the commonly used acidic hole transporting material PEDOT:PSS, which reacts with the indispensable basic additive SnF2 in the perovskite layer. By acidity control of PEDOT:PSS via aqueous ammonia, the NBG PSCs yield an efficiency of 22.0% with much improved photostability, which can maintain 91.3% of the initial value after 800 h illumination under AM 1.5G. As an application, the corresponding all‐perovskite tandem cells exhibit a stabilized efficiency of 25.3% with 92% remaining after 560 h illumination. This work reveals an origin of instability of NBG PSCs and provides an effective approach to enhance the device stability, which can promote the development of all‐perovskite tandem solar cells.

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Section: Resultsmentioning

confidence: 86%

Acidity Control of Interface for Improving Stability of All‐Perovskite Tandem Solar Cells

Zhou

Qiu

Wen

et al. 2023

Advanced Energy Materials

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“…The tuneable Lewis basicity of halides in Sn HaPs (from softer to harder: I À < Br À < Cl À < F À ) may also be useful to promote homogeneous growth via the formation of Sn 2 + halide adducts, and even to selectively sequestrate Sn 4 + in solution. [16] Altogether, these examples illustrate the importance of halide engineering towards Sn HaPs with high performance and stability. This can address the limitations of Sn HaPs, but also extend their functionality, e.g.…”

Section: Introductionmentioning

confidence: 94%

Halide Chemistry in Tin Perovskite Optoelectronics: Bottlenecks and Opportunities

et al. 2022

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Tin halide perovskites (Sn HaPs) are the top lead-free choice for perovskite optoelectronics, but the oxidation of perovskite Sn 2 + to Sn 4 + remains a key challenge. However, the role of inconspicuous chemical processes remains underexplored. Specifically, the halide component in Sn HaPs (typically iodide) has been shown to play a key role in dictating device performance and stability due to its high reactivity. Here we describe the impact of native halide chemistry on Sn HaPs. Specifically, molecular halogen formation in Sn HaPs and its influence on degradation is reviewed, emphasising the benefits of iodide substitution for improving stability. Next, the ecological impact of halide products of Sn HaP degradation and its mitigation are considered. The development of visible Sn HaP emitters via halide tuning is also summarised. Lastly, halide defect management and interfacial engineering for Sn HaP devices are discussed. These insights will inspire efficient and robust Sn HaP optoelectronics.

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“…The most commonly used additives as Sn(II) vacancy compensators in tin‐based perovskite solar cells are tin (II) halides, which have additionally been shown to sequestrate Sn 4+ in solution. [ 123 ] Kumar et al. first added SnF 2 into the precursor for CsSnI 3 deposition.…”

Section: Additive Engineeringmentioning

confidence: 99%

Engineering Stable Lead‐Free Tin Halide Perovskite Solar Cells: Lessons from Materials Chemistry

et al. 2023

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demonstrating a lower dependence on fossil fuels. Although crystalline silicon (c-Si) is still the market front runner for PV due to its ideal bandgap for single-junction solar cells, c-Si does not have a readily tunable bandgap. This makes c-Si less suited for indoor PV or multijunction solar cells, which require alternative bandgaps to operate at their peak. In just over a decade of research, perovskite solar cells (PSCs) have emerged as an alternative PV technology which have tuneable bandgaps, low fabrication costs, solution processability, compliancy with flexible materials, long electron-hole diffusion length, and high charge carrier mobility. [2][3][4][5][6][7][8][9] The perovskite absorber layer is based on the ABX 3 crystal structure made up of organic/inorganic monovalent cations (A), a divalent cation (B) and one or more halides (X) as shown in Figure 1a. [10] Since the first publication on PSCs in 2009, the power conversion efficiencies (PCE) have gone from 3.8% to 25.7 %, making PSCs the fastest growing PV technology to date. [11][12][13] Despite their promise, toxic heavy metal element Pb (in the structure's B-site) is still required to achieve highly competitive efficiencies, [14][15][16][17][18][19][20][21][22][23] which is a major obstacle in the field that is yet to be overcome. In contact with moisture and/or light + oxygen lead halide perovskites can easily decompose into watersoluble compounds of lead, [24][25][26][27][28] which then inevitably accumulate within the food chain and therefore have the potential to ingress into the human body. [29] While several low toxicity metal halide alternatives to Pb have been proposed, [30][31][32][33][34][35] the favorable physical and optical properties of Sn make it the most promising substitute. [29,36] The first demonstration of Sn-halide PSCs was in 2014, where Hao et al. and Noel et al. reported 5.7% and 6.4% PCE respectively using methylammonium tin halides as the absorber layers (MAS-nIBr 2 and MASnI 3 , respectively). [30,31] At present, the highest performing Sn-halide PSCs show PCEs of over 14%; Yu et al. reported certified 14.03%-efficient 2D/3D perovskite solar cells, [37] while Jiang et al. achieved a certified PCE of 14.6% via a novel film fabrication route based on SnI 2 adducts (further details will be provided below). [38] To date, most of the progress with Sn-halide perovskites has been made using formamidinium tin iodide (FASnI 3 , see Figure 1b) and closely related recipes. [39][40][41][42][43] The favored use of the FA cation can be attributed to the higher formation energies of Sn vacancies in FASnI 3 and thus a lower hole density in comparison to MASnI 3 . [44] In comparison to their Pb-based counterparts, Sn-halide perovskites Substituting toxic lead with tin (Sn) in perovskite solar cells (PSCs) is the most promising route toward the development of high-efficiency lead-free devices. Despite the encouraging efficiencies of Sn-PSCs, they are still yet to surpass 15% and suffer detrimental oxidation of Sn(II) to Sn(IV). Since their...

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Fluoridchemie in Zinn‐Halogenid‐Perowskiten

Cited by 16 publications

References 47 publications

Acidity Control of Interface for Improving Stability of All‐Perovskite Tandem Solar Cells

Acidity Control of Interface for Improving Stability of All‐Perovskite Tandem Solar Cells

Halide Chemistry in Tin Perovskite Optoelectronics: Bottlenecks and Opportunities

Engineering Stable Lead‐Free Tin Halide Perovskite Solar Cells: Lessons from Materials Chemistry

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