Fluorine ion induced phase evolution of tin-based perovskite thin films: structure and properties

Wu, Junsheng; Fang, Fang; Zhao, Zhuo; Li, Tong; Lv, Zhiliang; Zhou, Yanwen; Sawtell, David

doi:10.1039/c9ra07415e

Cited by 21 publications

(20 citation statements)

References 40 publications

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“…It should be noted that SnF 2 doping can inhibit the phase transition of CsSnI 3 at room temperature, and the retarded phase transition is due to the stronger bond between F and Sn than that between I and Sn. [60] These results imply that CsSnI 3 is very sensitive to air, thermal, and organic solvents. Therefore, exploration of strategies, that can stabilize the photovoltaic phase of CsSnI 3 at room temperature (i. e., B-γ phase), is of great importance to realize PSCs with high PCE and device stability.…”

Section: Crystallographic Propertymentioning

confidence: 93%

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

Liu¹,

Gao²,

Ran³

et al. 2020

ChemSusChem

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Recently, the power conversion efficiency (PCE) of perovskite solar cells (PSC) based on organic‐inorganic hybrid Pb halide perovskites has reached 25.2 %. However, the toxicity of Pb has still been a main concern for the large‐scale commercialization of Pb‐based PSCs. Efforts have been made during the past few years to seek eco‐friendly Pb‐free perovskites, and it is a growing consensus that Sn is the best choice as Pb alternative over any other Pb‐free metal elements. Among Sn‐based perovskites, all‐inorganic cells are promising candidates for PSCs owing to their more suitable bandgap, better stability, and higher charge mobility compared to the organic‐inorganic hybrid counterparts. However, the poor phase stability of all‐inorganic Sn‐based perovskites (AISPs) and low PCE of their PSCs are most challenging in the field at present. Herein, recent developments on PSCs based on AISPs, including CsSnX3 and Cs2SnX6 (X=Br, I), are comprehensively reviewed. Primarily, the intrinsic characteristics of the two AISPs are overviewed, including crystallographic property, band structure, charge carrier property, and defect property. Sequentially, state‐of‐the‐art progress, regarding the photovoltaic application of AISPs as light absorber, is summarized. At last, current challenges and future opportunities of AISP‐based PSCs are also discussed.

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Section: Crystallographic Propertymentioning

confidence: 93%

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

Liu¹,

Gao²,

Ran³

et al. 2020

ChemSusChem

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“…Therefore, fluoride complex was introduced as additive to improve the stability of Sn‐based PVK. Wu et al [108] . demonstrated that F ion dopant inhibits the oxidation process, and slows down the phase transformation of CsSnI 3 into Cs 2 SnI 6 .…”

Section: Other Halides and Pseudo‐halides Additives For Pvk Filmsmentioning

confidence: 99%

Chlorides, other Halides, and Pseudo‐Halides as Additives for the Fabrication of Efficient and Stable Perovskite Solar Cells

2021

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Perovskite solar cells (PSCs) are attracting a tremendous attention from the scientific community due to their excellent power conversion efficiency, low cost, and great promise for the future of solar energy. The best PSCs have already achieved a certified power conversion efficiency (PCE) of 25.5 % after an unprecedented rapid performance rise. However, high requirements with respect to large area, high‐efficiency devices, and stability are still the challenges. Major efforts, especially for achieving a high degree of chemical control, have been made to reach these targets. The use of halide additives has played a critical role in improving the efficiency and stability. The present paper reviews the important breakthroughs in PSC technologies made by using halide additives, especially chloride, and pseudo‐halide additives for the preparation of the perovskite layers, other layers, and interfaces of the devices. These additives help perovskite (PVK) crystallization and layer morphology control, grain boundary reduction, bulk and interface defects passivation, and so on. Normally, these halide additives play different roles depending on their categories and their location. Herein, recent progresses made due to additives employment in every possible layer of PSCs are reviewed, with focus on chloride, other halides, and pseudo‐halides as additives in PVK films, halide additives in carrier transport layers, and at PVK‐contact interfaces. Finally, an outlook of engineering of these additives in PSC progress is given.

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“…A high carrier mobility of ∼ 10 2 to 10 3 cm 2 V −1 s −1 for Sn‐based perovskites was demonstrated by Stoumpos and coworkers, [ 7,14 ] As candidate materials for PVs, Sn‐based perovskites retain superior optoelectronic properties such as long diffusion lengths. It was reported by Wu and coworkers that melt‐synthesized CsSnI 3 ingots which contained high‐quality single crystals exhibited diffusion lengths reaching 1 µm with bulk carrier lifetimes approaching 6.6 ns and doping concentrations of ∼4.5 × 10 17 cm −3,[ 15,16 ] On the other hand, Sn‐based perovskites are direct‐bandgap semiconductors, viz. the valence band maximum (VBM) and the conduction band minimum (CBM) lie at the same point in reciprocal space, and possess narrower bandgaps compared with their Pb analogues.…”

Section: Chemical Structurementioning

confidence: 99%

ASnX₃—Better than Pb‐based Perovskite

et al. 2020

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Organic‐inorganic halide perovskite solar cells (PSCs) have drawn tremendous attention as their power conversion efficiency (PCE) has soared to 25.2%. Yet the most efficient halide perovskite materials all contain the toxic element lead (Pb). The search for an alternative element is a crucial research direction. Among all candidates, tin (Sn) appears to be the most promising one for its nontoxicity and physical similarity to lead (Pb). Herein, we review and summarize recent advancements in this emerging research area of Sn‐based perovskites. First, we discuss the photophysical dynamics of the Sn‐based perovskites and the relatively high efficiency of corresponding PSCs and other applications. Then, the attention is focused on the fabrication process and methods to improve the performance of Sn‐based photovoltaic devices. Despite the fact that the stabilities of the materials and related devices are far from perfect, the Sn‐based perovskites are still the best candidates with vast potential among all the Pb‐free perovskites for PSC application.

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Fluorine ion induced phase evolution of tin-based perovskite thin films: structure and properties

Abstract: Fluorine dopant inhibited the oxidation process in CsSnI3−xFx films with high carrier concentration, low resistivity and wide light absorption.

Cited by 21 publications

References 40 publications

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

Chlorides, other Halides, and Pseudo‐Halides as Additives for the Fabrication of Efficient and Stable Perovskite Solar Cells

ASnX₃—Better than Pb‐based Perovskite

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Fluorine ion induced phase evolution of tin-based perovskite thin films: structure and properties

Abstract: Fluorine dopant inhibited the oxidation process in CsSnI3−xFx films with high carrier concentration, low resistivity and wide light absorption.

Cited by 21 publications

References 40 publications

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

All‐inorganic Sn‐based Perovskite Solar Cells: Status, Challenges, and Perspectives

Chlorides, other Halides, and Pseudo‐Halides as Additives for the Fabrication of Efficient and Stable Perovskite Solar Cells

ASnX3—Better than Pb‐based Perovskite

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Product

Resources

About

ASnX₃—Better than Pb‐based Perovskite