Lead‐Free Halide Double Perovskite Cs<sub>2</sub>AgBiBr<sub>6</sub> with Decreased Band Gap

Ji, Fuxiang; Klarbring, Johan; Wang, Feng; Ning, Weihua; Wang, Linqin; Yin, Chunyang; Figueroa, José Silvestre Mendoza; Christensen, Christian Kolle; Etter, Martin; Ederth, Thomas; Sun, Licheng; Simak, Sergei I.; Abrikosov, Igor A.; Gao, Feng

doi:10.1002/ange.202005568

Cited by 49 publications

(38 citation statements)

References 23 publications

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“…4 A promising approach to solve these issues is to replace divalent Pb 2+ with monovalent B + and trivalent B 3+ metal ions, forming a double perovskite with the formula of A 2 B + B 3+ X 6 (A ¼ Cs + , CH 3 NH 3 + ; B ¼ metal ions; X ¼ Cl À , Br À , I À ). [5][6][7] Unfortunately, the large bandgaps of the current double perovskites limit their practical applications. Alloying/doping is a simple yet efficient method to tune the bandgaps of a wide range of materials, including traditional inorganic semiconductors, 8,9 oxide-based perovskites, 10 Pbbased perovskites, 11 as well as lead-free halide double perovskites.…”

Section: Introductionmentioning

confidence: 99%

The atomic-level structure of bandgap engineered double perovskite alloys Cs₂AgIn_1−xFe_xCl₆

Wang

Kobera

et al. 2021

Chem. Sci.

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Section: Introductionmentioning

confidence: 99%

The atomic-level structure of bandgap engineered double perovskite alloys Cs₂AgIn_1−xFe_xCl₆

Wang

Kobera

et al. 2021

Chem. Sci.

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“…Gao and co‐workers investigated the effect of synthesis temperature on single crystals. [ 105 ] They heated the hydrous solution with HBr, CsBr, BiBr 3 , and AgBr precursors on hot plates at 60 and 150 °C, as shown in Figure 7c. As the growth temperature increases from 60 to 150 °C, the color of the resulting Cs 2 AgBiBr 6 single crystals changes from red to black, indicating a wider absorption range induced as a resulting of the significantly narrowed bandgap (Figure 7d).…”

Section: Synthesis Of Ilfp Single Crystalsmentioning

confidence: 99%

Section: Synthesis Of Ilfp Single Crystalsmentioning

confidence: 99%

“…Reproduced with permission. [ 105 ] Copyright 2020, Wiley‐VCH GmbH. d) XRD results of Cs 4 MnBi 2 Cl 12 single crystals after storing in air for 90 days and UV‐illuminating for 72 h. e) Photographs of Cs 4 MnBi 2 Cl 12 single crystals after immersing in DMSO, DMF, EtOH, IPA, PA, PhMe for various periods.…”

Section: Properties Of Ilfp Single Crystalsmentioning

confidence: 99%

“…Figure 14c shows the time‐dependent X‐ray diffraction (XRD) results of a Cs 2 AgBiBr 6 single crystal, demonstrating unchanged XRD peaks with no phase transformation and decomposition after storing in an ambient atmosphere for 240 days. [ 105 ] Singh and co‐workers immersed a Rb 0.05 Cs 2.95 Bi 2 I 9 single crystal in pure water to investigate the time‐dependent absorption change. [ 69 ] After 12 h, no obvious change in its absorption spectra was found, implying the excellent stability of the ILFP single crystal against water.…”

Section: Properties Of Ilfp Single Crystalsmentioning

confidence: 99%

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All‐Inorganic Lead‐Free Perovskite(‐Like) Single Crystals: Synthesis, Properties, and Applications

et al. 2021

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Due to their nontoxicity, stability, and unique optoelectronic properties, all‐inorganic lead‐free halide semiconductors with perovskite and perovskite‐like structures have successfully emerged as promising optoelectronic materials for various applications, such as solar cells, light‐emitting diodes (LEDs), photodetectors, and X‐ray detectors. To further explore their practical potentials, researchers have paid more attention in all‐inorganic lead‐free perovskite (‐like) (ILFP) single crystals. For these single crystals, the advantages of large sizes, uniform surface morphology, and few defects can facilitate their excellent performances and practical applications. Besides, compared with the low dimensional and polycrystalline ILFP materials, the ILFP single crystals feature enhanced performances, including a longer carrier diffusion length and a larger light absorption coefficient, which attract a great deal of attention. Therefore, focus is on the researching progress of ILFP single crystals and the development of their preparation methods, as well as the novel properties of ILFP single crystals. In addition, the reported applications of ILFP single crystals are proposed to highlight their practical importance. With the perspective of the evolution and challenges, the current limitations of the materials and devices are discussed, followed by an inspirational outlook on their future development directions.

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Recent Progress and Challenges of Bismuth‐Based Halide Perovskites for Emerging Optoelectronic Applications

Chen

Jia

et al. 2022

Advanced Optical Materials

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Recently, the lead-halide perovskites have aroused great interest for advanced optoelectronic applications due to their excellent optoelectronic characteristics including large light absorption coefficients, high charge carrier mobility, prolonged charge carrier lifetime, large carrier diffusion lengths, outstanding defects tolerance, and low-cost solution processability. [1][2][3][4] In 2009, Miyasaka and co-workers initially used the perovskites as absorbers in photovoltaic devices, and obtained a power conversion efficiency (PCE) of 3.8%. [5] Within a short period of a decade, the maximum certified PCE of single-cell perovskite-based photovoltaic devices has reached 25.8%, which is comparable to that of the commercial crystalline Si solar cells. [6] Besides the photovoltaic devices, [7][8][9] the perovskites also have been applied to the photodetectors, [10,11] photocatalysis, [12,13] field-effect transistors, [14,15] light-emitting diodes (LEDs), [16][17][18][19] X-ray imaging, [20][21][22] lasing, [23,24] and so on. Despite a series of impressive advances achieved in above fields, the practical industrialization of these emerging technologies still suffers from two thorny issues, namely, the lead toxicity and the poor stability against light, heat, and humidity. [25][26][27] Thus, searching for less-or nontoxicity and environmentally stable perovskites with similar optoelectronic properties of lead-halide perovskites would be an emerging and effective pace for the commercial applications.Based on the previous researches, the excellent optoelectronic properties of Pb-based perovskite materials originate from the unique atomic electronic configuration with lone-pair Pb 6s 2 electrons and an empty Pb 6p orbital, as well as its large size and heavy mass, contributing to a strong spin-orbit coupling. [28][29][30] Therefore, the stable and nontoxic substitutes of Pb element should have the similar atomic electronic configuration. Theoretically, the most suitable choice for Pb replacement is to use the group-14 metal elements with the same lone-pair s orbitals as Pb, such as tin (Sn) and germanium (Ge). [31][32][33] However, Sn-and Ge-based perovskites show very poor stability because of the rapid oxidation of Sn 2+ and Ge 2+ to +4 states. Furthermore, Sn might be even more toxic than Pb for human beings upon dispersion into the environment.Recently, metal halide perovskites have attracted extensive attentions owing to their superior optoelectronic properties in various device applications, such as solar cells, photodetectors, light-emitting diodes, lasing, photocatalysis, etc. Up to now, the state-of-the-art developments of perovskite-based devices are most using the lead-halide perovskite system. However, the presence of lead (Pb) in these devices, which is insidious bioaccumulative hazard to human bodies, and a poor stability against light, heat, and humidity hamper their practical applications and future commercialization. Therefore, the scientific community is searching for low-toxicity and environmentalfriend...

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Lead‐Free Halide Double Perovskite Cs₂AgBiBr₆ with Decreased Band Gap

Cited by 49 publications

References 23 publications

The atomic-level structure of bandgap engineered double perovskite alloys Cs₂AgIn_1−xFe_xCl₆

The atomic-level structure of bandgap engineered double perovskite alloys Cs₂AgIn_1−xFe_xCl₆

All‐Inorganic Lead‐Free Perovskite(‐Like) Single Crystals: Synthesis, Properties, and Applications

Recent Progress and Challenges of Bismuth‐Based Halide Perovskites for Emerging Optoelectronic Applications

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Lead‐Free Halide Double Perovskite Cs2AgBiBr6 with Decreased Band Gap

Cited by 49 publications

References 23 publications

The atomic-level structure of bandgap engineered double perovskite alloys Cs2AgIn1−xFexCl6

The atomic-level structure of bandgap engineered double perovskite alloys Cs2AgIn1−xFexCl6

All‐Inorganic Lead‐Free Perovskite(‐Like) Single Crystals: Synthesis, Properties, and Applications

Recent Progress and Challenges of Bismuth‐Based Halide Perovskites for Emerging Optoelectronic Applications

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Lead‐Free Halide Double Perovskite Cs₂AgBiBr₆ with Decreased Band Gap

The atomic-level structure of bandgap engineered double perovskite alloys Cs₂AgIn_1−xFe_xCl₆

The atomic-level structure of bandgap engineered double perovskite alloys Cs₂AgIn_1−xFe_xCl₆