Highly stable, phase pure Cs<sub>2</sub>AgBiBr<sub>6</sub> double perovskite thin films for optoelectronic applications

Greul, Enrico; Petrus, Michiel L.; Binek, Andreas; Docampo, Pablo; Bein, Thomas

doi:10.1039/c7ta06816f

Cited by 584 publications

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“…[55] Second, for B(III) cations, the transition metal cations with multiple oxidation states and/or partially occupied d or f orbitals are not desirable for designing photovoltaic absorbers, because they may introduce deep defect states and too localized band edges. Largesize single crystals, [155,[172][173][174] nanocrystals, [175][176][177][178] and highquality films [179][180][181][182] The element Au is half-colored because it exists only in the compounds A 2 Au 2 X 6 with A = Rb, Cs and X = Cl, Br, I. Most of the reported double perovskites are fluorides and chlorides, [158,159] which generally have too large bandgaps for photovoltaic applications.…”

Section: A 2 B(i)b(ii)x 6 Halide Double Perovskitesmentioning

confidence: 99%

From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives

2019

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serious challenges due to the inclusion of toxic Pb and instability against moisture, heat, and irradiation. In recent years, significant efforts have been paid to develop Pb-free halide perovskite and perovskite derivative absorber materials. However, so far, solar cells based on these materials show significantly inferior performances as compared to their Pb halide perovskite counterparts. Herein, we provide reviews on the fundamental understandings of the photovoltaic properties from Pb halide perovskites to Pb-free metal halide perovskites and perovskite derivatives as well as the experimental results reported in the literature. The results suggest that replacing Pb by nontoxic elements may degrade the superior photovoltaic properties seen in Pb halide perovskites, explaining the fact that all reported solar cells based on Pb-free perovskites or perovskite derivatives show performances significantly lower than Pb halide perovskite solar cells. Overview: Approaches and Consequences of Pb ReplacementWe first provide an overview of the approaches and consequences of Pb replacement reported in the literature, as shown in Figure 1. In general, there are two categories for Pb replacement: using either homovalent elements such as Sn and Ge or heterovalent elements such as Bi and Sb. The heterovalent replacement category can be divided into two subcategories based on the ways to maintain the charge neutrality: ion-splitting and ordered vacancy. The ion-splitting subcategory can be further divided into mixed anion compounds with the formula of AB(Ch,X) 3 , where Ch represents a chalcogen element, and X represents a halogen element, and mixed cation compounds with a formula of A 2 B(I)B(III)X 6 , which are commonly called double perovskites. The ordered vacancy subcategory can also be divided into the B(III) compounds with a formula of A 3 ◻B(III)X 9 and the B(IV) compounds with a formula of A 2 ◻ B(IV)X 6 (the sign of ◻ indicates vacancy). Figure 1 also summarizes the photovoltaic properties and the stabilities of each group of materials, which provides a clear overview of the consequences of Pb replacement. While the homovalent replacement by Sn or Ge leads to instability, the heterovalent Pb replacement leads to degraded electronic properties mainly due to the reduction on electronic dimensionality. As a result, all the reported Pb-free perovskite and perovskite derivative solar Despite the exciting progress on power conversion efficiencies, the commercialization of the emerging lead (Pb) halide perovskite solar cell technology still faces significant challenges, one of which is the inclusion of toxic Pb. Searching for Pb-free perovskite solar cell absorbers is currently an attractive research direction. The approaches used for and the consequences of Pb replacement are reviewed herein. Reviews on the theoretical understanding of the electronic, optical, and defect properties of Pb and Pb-free halide perovskites and perovskite derivatives are provided, as well as the experimental results available in the literature....

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Section: A 2 B(i)b(ii)x 6 Halide Double Perovskitesmentioning

confidence: 99%

From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives

2019

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“…[35][36][37][38][39][40] Devices based on this structural type have reached efficiencies of more than 2% so far. 35 However, theoretical studies prove that the Ag(I) and Bi(III) combination leads to indirect wide bandgap materials, suggesting the double-perovskite motif may be limited for PV applications. 37 4 ] as a lead-free candidate in solar energy conversion/storage integration devices.…”

Section: Introductionmentioning

confidence: 99%

Extending lead-free hybrid photovoltaic materials to new structures: thiazolium, aminothiazolium and imidazolium iodobismuthates

Wang

Nichol

et al. 2018

Dalton Trans.

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We report on the synthesis, crystal structures, optoelectronic properties and solar cell device studies of three novel organic-inorganic iodobismuthates - ]) as the light absorber in a hole-conductor-free, fully printable solar cell, with relatively good reproducibility. We also note the observation of a capacitance effect for the first time in a photovoltaic device with bismuth-based solar absorber, which may be related to the mesoporous carbon counter-electrode.

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“…[5][6][7][8] With the progress of these organic-inorganic hybrid perovskite, all-inorganic halide perovskite has demonstrated to be another promising novel alternative candidate for various optoelectronic applications. [9][10][11][12][13][14][15] These allinorganic lead halide perovskites of CsPbX 3 (X ¼ I, Br, Cl) have advantage of higher thermal stability over the well-studied organic-inorganic hybrid lead halide perovskites, such as MAPbX 3 (X ¼ I, Br, Cl). [16][17][18] The excellent thermal stability of all-inorganic lead halide perovskites can be ascribed to the absence of volatile organic component and the higher formation energy.…”

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A Facile Low Temperature Fabrication of High Performance CsPbI₂Br All‐Inorganic Perovskite Solar Cells

et al. 2017

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All-inorganic lead halide perovskites α-CsPbI 2 Br with higher thermal stability and phase stability are promising candidate for optoelectronic application such as photovoltaics. However, the >250 C high temperature annealing is required to obtain the desired photovoltaic active perovskite phase of α-CsPbI 2 Br, which makes it difficult for fabrication and application based on flexible polymer substrate. Here, a facile formation of high performance allinorganic CsPbI 2 Br perovskite solar cell is reported, through a one-step method and a 100-130 C low temperature annealing process. The faciledeposited CsPbI 2 Br film demonstrates long-term phase stability at room temperature for a month and exhibits the thermal stability under 100 C annealing for more than a week. Consequently, the CsPbI 2 Br-based allinorganic perovskite solar cells (PSCs) exhibit power conversion efficiencies (PCE) of up to a record value of 10.56%. This low temperature crystallization of all-inorganic CsPbI 2 Br perovskite is a promising approach for scalable, convenient, and inexpensive fabrication in the future.Organic-inorganic hybrid lead halide perovskites have emerged as one class of most promising optoelectronic materials for various application due to their excellent optical absorption, good carrier mobility, and lifetime. [1][2][3][4] The power conversion efficiency (PCE) of organic-inorganic hybrid halide perovskite solar cells has progressed rapidly from unstable 3.8% to a certified 22.1% and their stability has also been significantly improved in a relatively short span of time, which make them promising for commercialization. [5][6][7][8] With the progress of these organic-inorganic hybrid perovskite, all-inorganic halide perovskite has demonstrated to be another promising novel alternative candidate for various optoelectronic applications. [9][10][11][12][13][14][15] These allinorganic lead halide perovskites of CsPbX 3 (X ¼ I, Br, Cl) have advantage of higher thermal stability over the well-studied organic-inorganic hybrid lead halide perovskites, such as MAPbX 3 (X ¼ I, Br, Cl). [16][17][18] The excellent thermal stability of all-inorganic lead halide perovskites can be ascribed to the absence of volatile organic component and the higher formation energy. [19] The high formation or crystallization energy helps enhance the thermal stability of CsPbX 3 perovskite but also induces the difficulty for fabrication. Now, CsPbX 3 -based perovskite can be either fabricated via a generally solution-process similar to the hybrid lead halide perovskites or advanced vacuum deposition. [20] Regarding on the solution-process, most reported CsPbX 3 exhibits a yellow orthorhombic phase upon formation at low temperature, which is unsuitable for solar cell applications. [21,22] Followed by a second-high temperature annealing, these yellow phases can form a black cubic perovskite phase. Generally, the yellow-to-black phase transformation occurs at temperatures of above 300 C. [23][24][25][26] A recent investigation on the crystal behavior of CsPb...

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Highly stable, phase pure Cs₂AgBiBr₆ double perovskite thin films for optoelectronic applications

Abstract: Cs2AgBiBr6 double perovskite thin films were prepared and incorporated into photovoltaic devices featuring power conversion efficiencies close to 2.5%.

Cited by 584 publications

References 58 publications

From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives

From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives

Extending lead-free hybrid photovoltaic materials to new structures: thiazolium, aminothiazolium and imidazolium iodobismuthates

A Facile Low Temperature Fabrication of High Performance CsPbI₂Br All‐Inorganic Perovskite Solar Cells

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Highly stable, phase pure Cs2AgBiBr6 double perovskite thin films for optoelectronic applications

Abstract: Cs2AgBiBr6 double perovskite thin films were prepared and incorporated into photovoltaic devices featuring power conversion efficiencies close to 2.5%.

Cited by 584 publications

References 58 publications

From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives

From Lead Halide Perovskites to Lead‐Free Metal Halide Perovskites and Perovskite Derivatives

Extending lead-free hybrid photovoltaic materials to new structures: thiazolium, aminothiazolium and imidazolium iodobismuthates

A Facile Low Temperature Fabrication of High Performance CsPbI2Br All‐Inorganic Perovskite Solar Cells

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Highly stable, phase pure Cs₂AgBiBr₆ double perovskite thin films for optoelectronic applications

A Facile Low Temperature Fabrication of High Performance CsPbI₂Br All‐Inorganic Perovskite Solar Cells