Highly ordered lead-free double perovskite halides by design

Ahn, Chang Won; Jo, Jae Hun; Kim, Jong Chan; Ullah, Hamid; Ryu, Sangwon; Hwang, Younghun; Choi, Jin Kyeong; Lee, Jongmin; Lee, Sanghan; Jeen, Hyoungjeen; Shin, Young‐Han; Jeong, Hu Young; Kim, Ill Won; Kim, Tae Heon

doi:10.1016/j.jmat.2020.05.008

Cited by 36 publications

(36 citation statements)

References 41 publications

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“…In the case of Pb-free halide perovskites, the crystal structure depends primarily on substitutions of B sites (e.g., Pb), including group-14 elements (Sn and Ge), ,, adjacent kin elements of Pb (Sb and Bi), , and double elements (Bi combined with Ag). − Various substitutions offer a wide diversity of crystal structures for Pb-free halide PSCs ranging from orthorhombic to trigonal lattice systems. The latter generates a quaternary structure of A 2 B + B 3+ X 6 , called double perovskites . Yet another derivative can be obtained by removing at regular intervals, half of the B atoms in each center of the [BX 6 ] octahedron.…”

Section: Structural Diversity In Lead-free Pscsmentioning

confidence: 99%

Advances in Lead-Free Perovskite Single Crystals: Fundamentals and Applications

Tailor

Kar

Mishra

et al. 2021

ACS Materials Lett.

104

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With rapid progress in the deployment of metal halide perovskites in various device applications such as solar cells, light-emitting devices, field-effect transistors, photodetectors, etc., the next eminent focus is on the single crystals of these materials. With a lack of grain boundaries and low trap densities, remarkably long charge carrier diffusion lengths, and high ambient and operational stabilities, this class of materials seems greatly promising. Yet, the growing concern for lead toxicity in commercial semiconductor devices has entailed a thrust in the research of alternative lead-free perovskites, including their single crystalline forms. However, there is still no consolidated account of the state-of-the-art in this domain and accordingly, countless feasible systems still remain unexplored. To bridge this gap, we attempt to provide here, an up-to-date overview of lead-free perovskite single crystals with respect to their synthesis methods, structural diversity, stability, photophysical and electrical properties, and device applications. We discuss various approaches to designing, modeling, fabricating, and characterizing new single-crystal systems and conclude with some critical insights for further investigating this field of research.

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Section: Structural Diversity In Lead-free Pscsmentioning

confidence: 99%

Advances in Lead-Free Perovskite Single Crystals: Fundamentals and Applications

Tailor

Kar

Mishra

et al. 2021

ACS Materials Lett.

104

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“…reported on limiting factors in complete solar cells, revealing that one factor hampering the solar cell efficiency is a small electron diffusion length while the hole‐diffusion length is rather large. [ 37 ] Much effort has been put into the optimization of crystallinity and orientation of thin films of Cs 2 AgBiBr 6 , [ 20,38 ] as well as interface modifications, [ 23,39,40 ] the improvement of the optoelectronic properties of single crystals [ 41,42 ] or regarding the origin of the photoluminescence (PL). [ 43,44 ] Yet, there is still no consensus on how to exactly interpret the absorption and emission features [ 44,45 ] and how to explain the severe differences between reported optical data of nominally the same material.…”

Section: Introductionmentioning

confidence: 99%

The Bottlenecks of Cs₂AgBiBr₆ Solar Cells: How Contacts and Slow Transients Limit the Performance

Sirtl

Ebadi²,

Gorkom

et al. 2021

Advanced Optical Materials

105

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Cs2AgBiBr6 has attracted much interest as a potential lead‐free alternative for perovskite solar cells. Although this material offers encouraging optoelectronic features, severe bottlenecks limit the performance of the resulting solar cells to a power conversion efficiency of below 3%. Here, the performance‐limiting factors of this material are investigated in full solar cells featuring various architectures. It is found that the photovoltaic parameters of Cs2AgBiBr6‐based solar cells strongly depend on the scan speed of the J/V measurements, suggesting a strong impact of ionic conductivity in the material. Moreover, a sign change of the photocurrent for bias voltages above 0.9 V during the measurement of the external quantum efficiency (EQE) is revealed, which can be explained by non‐selective contacts. The radiative loss of the VOC from sensitive subgap‐EQE measurements is calculated and it is revealed that the loss is caused by a low external luminescence yield and therefore a high non‐radiative recombination, supported by the first report of a strongly red shifted electroluminescence signal between 800 and 1000 nm. Altogether, these results point to a poor selectivity of the contacts and charge transport layers, caused by poor energy level alignment that can be overcome by optimizing the architecture of the solar cell.

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“…[ 10–13 ] To address these problems, inorganic double perovskites, formed by transmuting the divalent lead cation (Pb 2+ ) sites into a combination of monovalent (M I ) and trivalent (M III ) sites or trivalent (M III ) and vacancy (□) sites to form double (Cs 2 M I M III X 6 ) and triple (Cs 3 □M III 2 X 9 ) perovskites (DPs and TPs), have emerged. [ 14,15 ] Cs 2 M I M III X 6 exhibits a typical perovskite structure, in which [M III X 6 ] 3− and [M I X 6 ] 5− octahedra are alternately corner connected to form a 3D cubic structure. [ 16–18 ] Vacancy sites in perovskites can efficiently break the 3D perovskites into low‐dimensional structures.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient White‐Light Emission Triggered by Sb³⁺ Dopant in Indium‐Based Double Perovskites

Zhou

Liu

et al. 2021

Advanced Photonics Research

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Inorganic indium‐based halide double perovskites (DPs) are environmentally friendly alternatives to lead‐based halide perovskites in light‐emitting diodes, but commonly suffer from low quantum efficiency and harsh synthesis conditions. Herein, a large‐scale green method using water as solvent is developed for the synthesis of 3D Cs2NaInCl6 and 0D Cs2InCl5·H2O with/without Sb3+ dopant at room temperature. The transformation between Cs2InCl5·H2O and Cs2NaInCl6 products is controlled by the concentration of eco‐friendly NaCl, where excess Cl− and Na+ ions play important roles in inhibiting In3+ hydrolysis and promoting Cs2NaInCl6 crystallization, respectively. The obtained Cs2NaInCl6:Sb and Cs2InCl5·H2O:Sb exhibit highly luminescent self‐trapped exciton‐related blue (450 nm; photoluminescence quantum yield [PLQY] ≈85%) and yellow (610 nm; PLQY ≈88%) emissions, which are comparable to those obtained by previous methods. Tunable cold/warm white light with a PLQY of up to ≈73% is achieved by the rational assembly of two components with highly overlapped excitation wavelength ranges. Each component demonstrates remarkable stability against humidity and heat. This composite shows great potential in solid‐state lighting for general illumination.

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Highly ordered lead-free double perovskite halides by design

Cited by 36 publications

References 41 publications

Advances in Lead-Free Perovskite Single Crystals: Fundamentals and Applications

Advances in Lead-Free Perovskite Single Crystals: Fundamentals and Applications

The Bottlenecks of Cs₂AgBiBr₆ Solar Cells: How Contacts and Slow Transients Limit the Performance

Highly Efficient White‐Light Emission Triggered by Sb³⁺ Dopant in Indium‐Based Double Perovskites

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Highly ordered lead-free double perovskite halides by design

Cited by 36 publications

References 41 publications

Advances in Lead-Free Perovskite Single Crystals: Fundamentals and Applications

Advances in Lead-Free Perovskite Single Crystals: Fundamentals and Applications

The Bottlenecks of Cs2AgBiBr6 Solar Cells: How Contacts and Slow Transients Limit the Performance

Highly Efficient White‐Light Emission Triggered by Sb3+ Dopant in Indium‐Based Double Perovskites

Contact Info

Product

Resources

About

The Bottlenecks of Cs₂AgBiBr₆ Solar Cells: How Contacts and Slow Transients Limit the Performance

Highly Efficient White‐Light Emission Triggered by Sb³⁺ Dopant in Indium‐Based Double Perovskites