Recent Advances and Optoelectronic Applications of Lead‐Free Halide Double Perovskites

Lü, Lei; Pan, Xunzhang; Luo, Junhua; Sun, Zhihua

doi:10.1002/chem.202000788

Cited by 48 publications

(27 citation statements)

References 95 publications

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“…promising candidates for application as lasers,l ight-emitting diodes,field-effect transistors,photodetectors,and solar cells, thanks to their easy and cheap production, high photoluminescence quantum yields,m ulticolor emission, and excellent excitonic and charge carrier properties (Figure 1A). [28][29][30][31][32][33][34] In particular,H OIHPs hold great potential for next-generation solar cells.T he first application of perovskites as al ight harvester in solar cells was reported in 2009, [35] and since then, PSC performance has improved dramatically,r eaching efficiencies higher than 25 %. [36] Further enhancements of cell performances can be achieved by controlling crystal growth and surface interactions of the perovskite layer.…”

Section: Methodsmentioning

confidence: 99%

Halogen Bonding in Perovskite Solar Cells: A New Tool for Improving Solar Energy Conversion

et al. 2022

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Hybrid organic–inorganic halide perovskites (HOIHPs) have recently emerged as a flourishing area of research. Their easy and low‐cost production and their unique optoelectronic properties make them promising materials for many applications. In particular, HOIHPs hold great potential for next‐generation solar cells. However, their practical implementation is still hindered by their poor stability in air and moisture, which is responsible for their short lifetime. Optimizing the chemical composition of materials and exploiting non‐covalent interactions for interfacial and defects engineering, as well as defect passivation, are efficient routes towards enhancing the overall efficiency and stability of perovskite solar cells (PSCs). Due to the rich halogen chemistry of HOIHPs, exploiting halogen bonding, in particular, may pave the way towards the development of highly stable PSCs. Improved crystallization and stability, reduction of the surface trap states, and the possibility of forming ordered structures have already been preliminarily demonstrated.

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Section: Methodsmentioning

confidence: 99%

Halogen Bonding in Perovskite Solar Cells: A New Tool for Improving Solar Energy Conversion

et al. 2022

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“…To evaluate the structural stability of B–X octahedrons, an octahedral factor (μ) (the ratio of ionic radii of B‐site and halide) is used in the design of lead‐free materials

\begin{matrix} μ = \frac{r_{B}}{r_{x}} \end{matrix}

where the r B and r x are the ionic radii of lead‐free metal ions and halide ions, respectively, and the ideal range of μ for a stable octahedron is 0.44–0.90. [ 44 ] Besides, the A‐site cations are important because it can determine the symmetry of structures and stability of phases. The Goldschmidt's tolerance factor ( t ), which depends on the ionic radius of the lead‐free ions and is an empirical parameter, is introduced to evaluate the symmetrical structure by

\begin{matrix} t = \frac{(r_{normalA} + r_{normalB})}{\sqrt{2} (r_{B} + r_{X})} \end{matrix}

…”

Section: Materials and Structures Of Ilfp Single Crystalsmentioning

confidence: 99%

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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“…The double perovskite Cs 2 AgBiBr 6 is currently being investigated intensively as a possible absorber material in thin-film devices despite its rather low absorption in the visible spectral range caused by an indirect-bandgap transition, [81,82] which results from a mismatch between Ag d and Bi s orbitals [30] and its rather high exciton binding energies. [83,84] The large interest in this material can be explained by improved stability under ambient conditions [84] and reduced toxicity when compared to lead-based perovskites [85] as well as by the impressively long charge carrier lifetimes in Cs 2 AgBiBr 6 single crystals and thin films. [86,87] Nevertheless, the highest reported PCE of PCSs based on double perovskites as absorbers is as low as 3.1%, [88] and even this is only achieved by combining the double perovskite with a dye sensitizer as an additional absorber, adsorbed on the mesoporous TiO 2 , mainly serving as an ETM.…”

Section: Studies On the Double Perovskite Cs 2 Agbibrmentioning

confidence: 99%

“…However, because double perovskite layers still represent a relevant subgroup of less toxic perovskite materials, they can be synthesized under less demanding conditions and may become useful in other possible application, such as photodetectors and light emitting diodes. [32,85,[90][91][92] The following paragraphs are dedicated to studies of interfacing Cs 2 AgBiBr 6 with optional contact materials in heterojunctions.…”

Section: Studies On the Double Perovskite Cs 2 Agbibrmentioning

confidence: 99%

Role of Interfaces and Contact Formation for the Application of Lead‐Free Perovskite Materials in Photovoltaic Cells

Horn

Schlettwein

2021

Physica Rapid Research Ltrs

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Perovskite solar cells (PSCs) represent a promising approach toward a climate‐neutral energy supply. Great progress has been made to reach attractive efficiencies of photovoltaic cells at rather low energy input. However, the toxicity of today´s most efficient materials combined with their chemical instability even when assembled to devices poses unsolved problems. Alternative materials have been developed but up to now cannot compete in efficiency. In many instances, such lack of efficiency is caused by problems in contact formation. Aside from reports in cell architecture, a number of studies have focused on the specific investigation of contact phenomena, also in lateral geometry. Chemical reactivity at interfaces and migration of ions in contacts and within the perovskite materials lead to significant hysteresis in electron conduction and photovoltaic properties. Herein, recent results on such investigations for lead‐free perovskite materials are reviewed. The main findings of contact formation with these materials are summarized and the specific impact of different methods of analysis is discussed. By these means, the hope is to provide a good starting ground for groups with new approaches to materials chemistry or device architecture as well as to groups with new approaches to device analysis.

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Recent Advances and Optoelectronic Applications of Lead‐Free Halide Double Perovskites

Cited by 48 publications

References 95 publications

Halogen Bonding in Perovskite Solar Cells: A New Tool for Improving Solar Energy Conversion

Halogen Bonding in Perovskite Solar Cells: A New Tool for Improving Solar Energy Conversion

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

Role of Interfaces and Contact Formation for the Application of Lead‐Free Perovskite Materials in Photovoltaic Cells

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