Lead‐Free Silver‐Bismuth Halide Double Perovskite Nanocrystals

Yang, Bin; Chen, Junsheng; Yang, Songqiu; Hong, Feng; Sun, Lei; Han, Peigeng; Pullerits, Tõnu; Deng, Wei; Han, Keli

doi:10.1002/anie.201800660

Cited by 322 publications

(343 citation statements)

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“…[160] In the absence of other limiting photophysical properties exhibited by this compound, such excellent charge transport properties could make it endure higher film thickness with enhanced light absorption and higher PV performance. In a similar report, [163] femtosecond transient absorption spectroscopy was used to elucidate the charge carrier relaxation mechanism in Cs 2 AgBiBr 6 NCs. The decays in the PL spectra matched the rise in an excited state on a microsecond timescale.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

“…Conversely, Li et al proposed an In 3+ poor and Cl − rich growth condition to realize suppressed and shallow level defects in the Cs 2 AgInCl 6 analog. [163] Copyright 2018, Wiley-VCH. Particularly, Cu +based halide double perovskites such as Cs 2 CuInCl 6 have been Figure 5.…”

Section: + /In 3+ Halide Double Perovskitesmentioning

confidence: 99%

“…[149] Theoretical studies [52,97,101,113] have shown that direct and narrower bandgaps can be achieved in In 3+ -based halide double perovskites by replacing the Ag + with Cu + . [163] Copyright 2018, Wiley-VCH. a) ∆T/T spectra at different time ranges for Cs 2 AgBiBr 6 thin film.…”

Section: + /In 3+ Halide Double Perovskitesmentioning

confidence: 99%

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Progress of Lead‐Free Halide Double Perovskites

Igbari

Wang

Liao

2019

Advanced Energy Materials

392

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Although impressive performance has been obtained, PSCs are still far from commercial or real-life availability due to serious issues such as toxicity [15,16] and poor stability to heat, [17] oxygen, [18] moisture, [19,20] electric field, [21] and light. [18,22] The toxic nature of hybrid organic-inorganic lead halide perovskites has been traced to the presence of Pb in its chemical composition. [15,16,[23][24][25] Pb 2+ readily dissolves in water (e.g., rain water) to form a toxic solution capable of causing serious environmental pollution, harmful to human beings and the ecosystem. Besides their sensitivity to moisture, oxygen, light, electric field, or thermal stress, an existing self-degradation pathway [26,27] is also a big issue in hybrid organic-inorganic lead halide perovskites. Mixed-halide and mixed-cation perovskites have been investigated to address these issues. [28][29][30][31][32] The group IV elements, tin (Sn) [23,[33][34][35] and germanium (Ge), [34,36] have been employed as the replacements for Pb. However, the device performance through this approach has fallen short of the Pb-based ones. For example, the PCEs reported for Sn-based perovskite solar cells are usually less than 10%. [23,[33][34][35][37][38][39][40] In addition, the easy oxidation of Sn and Ge from the +2 state to the +4 state due to their high energy 5s and 4s orbitals makes them less promising for application in stable and long-term PSCs. [41] High throughput calculations also demonstrate that these substitutions are likely to compromise the ideal optoelectronic properties of MAPbI 3 . [42,43] Furthermore, low dimensional (e.g., 2D, 1D, and 0D) perovskites have also been used to address the stability issues in PSCs. [44][45][46][47][48] Recently, a stabilized PCE of 21.7% resulting from a 2D/3D bilayer PSC was reported. [49] However, the highest certified PCE in a 2D-only planar PSC is 15.3%, [50] which is far below that of their 3D perovskite-based counterparts. It thus stimulates the interest to develop new classes of materials which can solve the issues of toxicity and stability while still maintaining the fascinating properties of lead-based perovskite materials.Recent theoretical calculations demonstrate that a halide double perovskite structure, A 2 B′B″X 6 , which could be formed through a replacement of two toxic Pb 2+ in the crystal lattice with a pair of nontoxic heterovalent (i.e., monovalent and trivalent) metal cations, is a promising alternative to realize high-performance, lead-free, and stable PSCs. [51,52] Although, spectroscopic limited maximum efficiency (SLME) calculations revealed an efficiency limit less than 8% for the most prominent member www.advancedsciencenews.com double perovskites with a vacancy ordered structure. [88] In particular, the unit cell axis of Cs 2 AgBiBr 6 is given to be ≈11.25 Å, [25] which is two times larger than that of MAPbBr 3 (≈5.92 Å). [89] Both Ag + and Bi 3+ occupy the B-site of the crystal lattice with slightly varied metal-halide bond lengths. The dissimilar bond lengths st...

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Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Section: + /In 3+ Halide Double Perovskitesmentioning

confidence: 99%

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Progress of Lead‐Free Halide Double Perovskites

Igbari

Wang

Liao

2019

Advanced Energy Materials

392

305

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“…But it was usually used as absorber of the solar cell rather than the light‐emitting device . Up to now, several studies have reported the synthesis of colloidal double perovskite NCs including Cs 2 AgBiX 6 (X = Cl, Br, and I), Cs 2 AgSb 1− y Bi y X 6 (X = Br and Cl; 0 ≤ y ≤ 1) and Cs 2 AgIn x Bi 1− x Cl 6 ( x = 0, 0.25, 0.5 0.75, and 0.9) NCs . The reported highest PLQY is ≈36.6% .…”

mentioning

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Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals

Niu

Zheng

et al. 2019

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Recently, Bi‐doped Cs2Ag0.6Na0.4InCl6 lead‐free double perovskites demonstrating efficient warm‐white emission have been reported. To enable the solution processing and enrich the application fields of this promising material, here a colloidal synthesis of Cs2Ag1−xNaxIn1−yBiyCl6 nanocrystals is further developed. Different from its bulk states, the emission color temperatures of the nanocrystal can be tuned from 9759.7 to 4429.2 K by Na+ and Bi3+ incorporation. Furthermore, the newly developed nanocrystals can break the wavefunction symmetry of the self‐trapped excitons by partial replacement of Ag+ ions with Na+ ions and consequently allow radiative recombination. Assisted with Bi3+ ions doping and ligand passivation, the photoluminescence quantum yield of the Cs2Ag0.17Na0.83In0.88Bi0.12Cl6 nanocrystals is further promoted to 64%, which is the highest value for lead‐free perovskite nanocrystals at present. The new colloidal nanocrystals with tunable color temperature and efficient photoluminescence are expected to greatly advance the research progress of lead‐free perovskites in single‐emitter‐based white emitting materials and devices.

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“…Stability tests show that, when exposed to air and light for 6 weeks, films of Cs 2 AgBiBr 6 NCs exhibit some decomposition, while films of Cs 2 AgBiI 6 NCs fully decompose within 3 days. Cs 2 AgBiX 6 NCs were also obtained via direct synthesis by an anti‐solvent recrystallization . The obtained Cs 2 AgBiI 6 NCs were found to be stable in nanostructures, but no further investigations are available.…”

Section: Lead‐free Halide Perovskite Nanocrystals: Synthesis Stabilimentioning

confidence: 99%

Lead‐Free Halide Perovskite Nanocrystals: Crystal Structures, Synthesis, Stabilities, and Optical Properties

et al. 2019

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In recent years, there have been rapid advances in the synthesis of lead halide perovskite nanocrystals (NCs) for use in solar cells, light emitting diodes, lasers, and photodetectors. These compounds have a set of intriguing optical, excitonic, and charge transport properties, including outstanding photoluminescence quantum yield (PLQY) and tunable optical band gap. However, the necessary inclusion of lead, a toxic element, raises a critical concern for future commercial development. To address the toxicity issue, intense recent research effort has been devoted to developing lead‐free halide perovskite (LFHP) NCs. In this Review, we present a comprehensive overview of currently explored LFHP NCs with an emphasis on their crystal structures, synthesis, optical properties, and environmental stabilities (e.g., UV, heat, and moisture resistance). In addition, strategies for enhancing optical properties and stabilities of LFHP NCs as well as the state‐of‐the‐art applications are discussed. With the perspective of their properties and current challenges, we provide an outlook for future directions in this rapidly evolving field to achieve high‐quality LFHP NCs for a broader range of fundamental research and practical applications.

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Lead‐Free Silver‐Bismuth Halide Double Perovskite Nanocrystals

Cited by 322 publications

References 48 publications

Progress of Lead‐Free Halide Double Perovskites

Progress of Lead‐Free Halide Double Perovskites

Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals

Lead‐Free Halide Perovskite Nanocrystals: Crystal Structures, Synthesis, Stabilities, and Optical Properties

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Lead‐Free Silver‐Bismuth Halide Double Perovskite Nanocrystals

Cited by 322 publications

References 48 publications

Progress of Lead‐Free Halide Double Perovskites

Progress of Lead‐Free Halide Double Perovskites

Tunable Color Temperatures and Efficient White Emission from Cs2Ag1−xNaxIn1−yBiyCl6 Double Perovskite Nanocrystals

Lead‐Free Halide Perovskite Nanocrystals: Crystal Structures, Synthesis, Stabilities, and Optical Properties

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Tunable Color Temperatures and Efficient White Emission from Cs₂Ag₁₋_xNa_xIn₁₋_yBi_yCl₆ Double Perovskite Nanocrystals