Recent progress in Pb-free stable inorganic double halide perovskites

Zhenzhu Li; Wanjian Yin

doi:10.1088/1674-4926/39/7/071003

J. Semicond. > 2018, Volume 39 > Issue 7 > 071003, doi: 10.1088/1674-4926/39/7/071003

SPECIAL TOPIC ON SEMICONDUCTOR MATERIALS GENOME INITIATIVE: NEW CONCEPTS AND DISCOVERIES

Recent progress in Pb-free stable inorganic double halide perovskites

Zhenzhu Li^{1, 2} and Wanjian Yin^{1, 2,}

+ Author Affiliations

Corresponding author: Wanjian Yin, Email: wjyin@suda.edu.cn

Abstract: Although the power conversion efficiency (PCE) of CH₃NH₃PbI₃-based solar cells has achieved 22.1%, which is comparable to commercialized thin-film CdTe and Cu(In,Ga)Se₂ solar cells, the long-term stability is the main obstacle for the commercialization of perovskite solar cells. Recent efforts have been made to explore alternative inorganic perovskites, which were assumed to have better stability than organic-inorganic hybrid CH₃NH₃PbI₃. In this short review, we will keep up with experiments and summarize recent progresses of inorganic double halide perovskite, in particular to Cs₂AgBiBr₆, Cs₂AgInCl₆, Cs₂InBiBr₆ and their family members. We will also share our opinions on the promise of such class of materials.

Key words: double perovskite, solar cell, Pb-free

References

[1]	Kojima A, Teshima K, Shirai Y, et al. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J Am Chem Soc, 2009, 131: 6050 doi: 10.1021/ja809598r
[2]	Seo J, Noh J H, Seok S I, et al. Rational strategies for efficient perovskite solar cells. Acc Chem Res, 2016, 49: 562 doi: 10.1021/acs.accounts.5b00444
[3]	Grancini G, Roldan-Carmona C, Zimmermann I, et al. One-year stable perovskite solar cells by 2D/3D interface engineering. Nat Commun, 2017, 8: 15684 doi: 10.1038/ncomms15684
[4]	Noel N K, Stranks S D, Abate A, et al. Lead-free organic-inorganic tin halide perovskites for photovoltaic applications. Energy Environ Sci, 2014, 7: 3061 doi: 10.1039/C4EE01076K
[5]	Hao F, Stoumpos C C, Duyen Hanh C, et al. Lead-free solid-state organic–inorganic halide perovskite solar cells. Nat Photon, 2014, 8: 489 doi: 10.1038/nphoton.2014.82
[6]	Hanusch F C, Wiesenmayer E, Mankel E, et al. Efficient planar heterojunction perovskite solar cells based on formamidinium lead bromide. J Phys Chem Lett, 2014, 5: 2791 doi: 10.1021/jz501237m
[7]	Ju M G, Dai J, Ma L, et al. Lead-free mixed tin and germanium perovskites for photovoltaic application. J Am Chem Soc, 2017, 139: 8038 doi: 10.1021/jacs.7b04219
[8]	Giustino F, Snaith H J. Toward lead-free perovskite solar cells. ACS Energy Lett, 2016, 1: 1233 doi: 10.1021/acsenergylett.6b00499
[9]	Kojima N. Gold valence transition and phase diagram in the mixed-valence complexes, M₂ [(AuX₂)-X-I][(AuX₄)-X-III] (M = Rb, Cs; X = Cl, Br, and I). Bull Chem Soc Jpn, 2000, 73: 1445 doi: 10.1246/bcsj.73.1445
[10]	McClure E T, Ball M R, Windl W, et al. Cs₂AgBiX₆(X = Br, Cl): new visible light absorbing, lead-free halide perovskite semiconductors. Chem Mater, 2016, 28: 1348 doi: 10.1021/acs.chemmater.5b04231
[11]	Slavney A H, Hu T, Lindenberg A M, et al. A bismuth-halide double perovskite with long carrier recombination lifetime for photovoltaic applications. J Am Chem Soc, 2016, 138: 2138 doi: 10.1021/jacs.5b13294
[12]	Savory C N, Walsh A, Scanlon D O. Can Pb-free halide double perovskites support high-efficiency solar cells. Acs Energy Lett, 2016, 1: 949 doi: 10.1021/acsenergylett.6b00471
[13]	Filip M R, Hillman S, Haghighirad A A, et al. Band gaps of the lead-free halide double perovskites Cs₂BiAgCl₆ and Cs₂BiAgBr₆ from theory and experiment. J Phys Chem Lett, 2016, 7: 2579 doi: 10.1021/acs.jpclett.6b01041
[14]	Pan W C, Wu H D, Luo J J, et al. Cs₂AgBiBr₆ single-crystal X-ray detectors with a low detection limit. Nat Photon, 2017, 11: 726 doi: 10.1038/s41566-017-0012-4
[15]	Xiao Z, Meng W, Wang J, et al. Thermodynamic stability and defect chemistry of bismuth-based lead-free double perovskites. ChemSusChem, 2016, 9: 2628-2633 doi: 10.1002/cssc.201600771
[16]	Volonakis G, Filip M R, Haghighirad A A, et al. Lead-free halide double perovskites via heterovalent substitution of noble metals. J Phys Chem Lett, 2016, 7: 1254-9 doi: 10.1021/acs.jpclett.6b00376
[17]	Zhao X G, Yang D, Sun Y, et al. Cu–In halide perovskite solar absorbers. J Am Chem Soc, 2017, 139: 6718 doi: 10.1021/jacs.7b02120
[18]	Zhao X G, Yang J H, Fu Y, et al. Design of lead-free inorganic halide perovskites for solar cells via cation-transmutation. J Am Chem Soc, 2017, 139: 2630 doi: 10.1021/jacs.6b09645
[19]	Xiao Z, Du K Z, Meng W, et al. Intrinsic instability of Cs₂In(I)M(III)X₆ (M = Bi, Sb; X = Halogen) double perovskites: a combined density functional theory and experimental study. J Am Chem Soc, 2017, 139: 6054-6057 doi: 10.1021/jacs.7b02227
[20]	Xiao Z, Du K Z, Meng W, et al. Chemical origin of the stability difference between copper(I)- and silver(I)-based halide double perovskites. Angew Chem Int Edit, 2017, 56: 12107 doi: 10.1002/anie.201705113
[21]	Vargas B, Ramos E, Perez-Gutierrez E, et al. A direct bandgap copper-antimony halide perovskite. J Am Chem Soc, 2017, 139: 9116 doi: 10.1021/jacs.7b04119
[22]	Xiao Z, Meng W, Wang J, et al. Searching for promising new perovskite-based photovoltaic absorbers: the importance of electronic dimensionality. Mater Horiz, 2017, 4: 206 doi: 10.1039/C6MH00519E
[23]	Volonakis G, Haghighirad A A, Milot R L, et al. Cs₂InAgCl₆: a new lead-free halide double perovskite with direct band gap. J Phys Chem Lett, 2017, 8: 772 doi: 10.1021/acs.jpclett.6b02682
[24]	Yin W J, Chen H Y, Shi T T, et al. Origin of high electronic quality in structurally disordered CH₃NH₃PbI₃ and the passivation effect of Cl and O at grain boundaries. Adv Electron Mater, 2015, 1: 1500044 doi: 10.1002/aelm.201500044
[25]	Yin W J, Shi T T, Yan Y F. Unique properties of halide perovskites as possible origins of the superior solar cell performance. Adv Mater, 2014, 26: 4653 doi: 10.1002/adma.v26.27
[26]	Yin W J, Shi T T, Yan Y F. Unusual defect physics in CH₃NH₃PbI₃ perovskite solar cell absorber. Appl Phys Lett, 2014, 104: 063903 doi: 10.1063/1.4864778
[27]	Yin W J, Yang J H, Kang J, et al. Halide perovskite materials for solar cells: a theoretical review. J Mater Chem A, 2015, 3: 8926 doi: 10.1039/C4TA05033A
[28]	Meng W, Wang X, Xiao Z, et al. Parity-forbidden transitions and their impact on the optical absorption properties of lead-free metal halide perovskites and double perovskites. J Phys Chem Lett, 2017, 8: 2999 doi: 10.1021/acs.jpclett.7b01042
[29]	Volonakis G, Haghighirad A A, Snaith H J, et al. Route to stable lead-free double perovskites with the electronic structure of CH₃NH₃PbI₃: a case for mixed-cation [Cs/CH₃NH₃/ CH(NH₂)₂]₂InBiBr₆. J Phys Chem Lett, 2017, 8: 3917-3924 doi: 10.1021/acs.jpclett.7b01584
[30]	Du K Z, Meng W, Wang X, et al. Bandgap engineering of lead-free double perovskite Cs₂AgBiBr₆ through trivalent metal alloying. Angew Chem Int Ed Engl, 2017, 56: 8158 doi: 10.1002/anie.v56.28
[31]	Tran T T, Panella J R, Chamorro J R, et al. Designing indirect–direct bandgap transitions in double perovskites. Mater Horiz, 2017, 4: 688 doi: 10.1039/C7MH00239D

Fig. 1. (Color online) Possible route to achieve Pb-free stable perovskite solar cell absorbers, which are discussed in this short review paper.

DownLoad: Full-Size Img PowerPoint

Fig. 2. (Color online) Elements forming double halide perovskites with composition A₂B¹⁺B³⁺X₆. An element is colored in light blue if at least one compound with double halide perovskites structure containing that element has been synthesized. The triangular color tag specifies the site occupied by the element, according to the legend at the top. The compounds used to generate the table can be found in Ref. [8] and reference therein. Only structures that crystallize in the space group Fm $\bar 3$ m at room temperature have been considered for this table. The element Au is half-colored because it exists only in the compounds A₂Au₂X₆ with A = Rb, Cs and X = Cl, Br, I. The structure of these compounds is obtained from the standard double perovskite by alternating compressed and elongated AuX₆ octahedra^[9]. Reprinted with permission from Ref. [8].

DownLoad: Full-Size Img PowerPoint

Fig. 3. (Color online) (a) X-ray structure of the ordered double perovskite Cs₂AgBiBr₆. Orange, gray, turquoise, and brown spheres represent Bi, Ag, Cs and Br atoms, respectively. (b) Photograph of a single crystal of Cs₂AgBiBr₆. (c) The Bi³⁺ face-centered-cubic sublattice in Cs₂AgBiBr₆, consisting of edge-sharing tetrahedra. (d) Diffuse reflectance spectra of Cs₂AgBiBr₆ (blue) and CH₃NH₃PbBr₃ (red). Modified with permission from Refs. [10, 11].

DownLoad: Full-Size Img PowerPoint

Fig. 4. Band structure of (a) CsPbBr₃, (b) Cs₂AgBiBr₆, (c) CsPbCl₃ and (d) Cs₂AgBiCl₆. Reprinted from Ref. [10].

DownLoad: Full-Size Img PowerPoint

Fig. 5. (Color online) Calculated decomposition energies (ΔH_D) of In¹⁺ (left), Cu¹⁺ and Ag¹⁺ (right)-related double halide perovskites under different decomposition pathways. Positive ΔH_D means stable and negative ΔH_D means unstable. Modified with permission from Refs. [19, 20].

DownLoad: Full-Size Img PowerPoint

Fig. 6. (Color online) The nature of optical transitions for possible combinations of A₂B¹⁺B³⁺X₆ double halide perovskites. Reprinted from Ref. [28].

DownLoad: Full-Size Img PowerPoint

Fig. 7. (Color online) (a) Tauc plots for Cs₂AgSbCl₆, Cs₂AgSb_0.5In_0.5Cl₆, Cs₂AgSb_0.4In_0.6Cl₆, Cs₂AgSb_0.2In_0.8Cl₆ and Cs₂AgInCl₆. The plots show the characteristics of an indirect bandgap for Cs₂AgSbCl₆, a direct bandgap for Cs₂AgInCl₆ and a transition from indirect to direct bandgap of Cs₂AgSb_xIn_1−xCl₆ at x = 0.4. (b) Phase diagram for Cs₂AgSb_xAg_1−xCl₆ showing the bandgap trend as a function of Sb composition and a crossover from indirect to direct optical absorption in a solid solution at x = 0.4.

DownLoad: Full-Size Img PowerPoint

[1]	Kojima A, Teshima K, Shirai Y, et al. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J Am Chem Soc, 2009, 131: 6050 doi: 10.1021/ja809598r
[2]	Seo J, Noh J H, Seok S I, et al. Rational strategies for efficient perovskite solar cells. Acc Chem Res, 2016, 49: 562 doi: 10.1021/acs.accounts.5b00444
[3]	Grancini G, Roldan-Carmona C, Zimmermann I, et al. One-year stable perovskite solar cells by 2D/3D interface engineering. Nat Commun, 2017, 8: 15684 doi: 10.1038/ncomms15684
[4]	Noel N K, Stranks S D, Abate A, et al. Lead-free organic-inorganic tin halide perovskites for photovoltaic applications. Energy Environ Sci, 2014, 7: 3061 doi: 10.1039/C4EE01076K
[5]	Hao F, Stoumpos C C, Duyen Hanh C, et al. Lead-free solid-state organic–inorganic halide perovskite solar cells. Nat Photon, 2014, 8: 489 doi: 10.1038/nphoton.2014.82
[6]	Hanusch F C, Wiesenmayer E, Mankel E, et al. Efficient planar heterojunction perovskite solar cells based on formamidinium lead bromide. J Phys Chem Lett, 2014, 5: 2791 doi: 10.1021/jz501237m
[7]	Ju M G, Dai J, Ma L, et al. Lead-free mixed tin and germanium perovskites for photovoltaic application. J Am Chem Soc, 2017, 139: 8038 doi: 10.1021/jacs.7b04219
[8]	Giustino F, Snaith H J. Toward lead-free perovskite solar cells. ACS Energy Lett, 2016, 1: 1233 doi: 10.1021/acsenergylett.6b00499
[9]	Kojima N. Gold valence transition and phase diagram in the mixed-valence complexes, M₂ [(AuX₂)-X-I][(AuX₄)-X-III] (M = Rb, Cs; X = Cl, Br, and I). Bull Chem Soc Jpn, 2000, 73: 1445 doi: 10.1246/bcsj.73.1445
[10]	McClure E T, Ball M R, Windl W, et al. Cs₂AgBiX₆(X = Br, Cl): new visible light absorbing, lead-free halide perovskite semiconductors. Chem Mater, 2016, 28: 1348 doi: 10.1021/acs.chemmater.5b04231
[11]	Slavney A H, Hu T, Lindenberg A M, et al. A bismuth-halide double perovskite with long carrier recombination lifetime for photovoltaic applications. J Am Chem Soc, 2016, 138: 2138 doi: 10.1021/jacs.5b13294
[12]	Savory C N, Walsh A, Scanlon D O. Can Pb-free halide double perovskites support high-efficiency solar cells. Acs Energy Lett, 2016, 1: 949 doi: 10.1021/acsenergylett.6b00471
[13]	Filip M R, Hillman S, Haghighirad A A, et al. Band gaps of the lead-free halide double perovskites Cs₂BiAgCl₆ and Cs₂BiAgBr₆ from theory and experiment. J Phys Chem Lett, 2016, 7: 2579 doi: 10.1021/acs.jpclett.6b01041
[14]	Pan W C, Wu H D, Luo J J, et al. Cs₂AgBiBr₆ single-crystal X-ray detectors with a low detection limit. Nat Photon, 2017, 11: 726 doi: 10.1038/s41566-017-0012-4
[15]	Xiao Z, Meng W, Wang J, et al. Thermodynamic stability and defect chemistry of bismuth-based lead-free double perovskites. ChemSusChem, 2016, 9: 2628-2633 doi: 10.1002/cssc.201600771
[16]	Volonakis G, Filip M R, Haghighirad A A, et al. Lead-free halide double perovskites via heterovalent substitution of noble metals. J Phys Chem Lett, 2016, 7: 1254-9 doi: 10.1021/acs.jpclett.6b00376
[17]	Zhao X G, Yang D, Sun Y, et al. Cu–In halide perovskite solar absorbers. J Am Chem Soc, 2017, 139: 6718 doi: 10.1021/jacs.7b02120
[18]	Zhao X G, Yang J H, Fu Y, et al. Design of lead-free inorganic halide perovskites for solar cells via cation-transmutation. J Am Chem Soc, 2017, 139: 2630 doi: 10.1021/jacs.6b09645
[19]	Xiao Z, Du K Z, Meng W, et al. Intrinsic instability of Cs₂In(I)M(III)X₆ (M = Bi, Sb; X = Halogen) double perovskites: a combined density functional theory and experimental study. J Am Chem Soc, 2017, 139: 6054-6057 doi: 10.1021/jacs.7b02227
[20]	Xiao Z, Du K Z, Meng W, et al. Chemical origin of the stability difference between copper(I)- and silver(I)-based halide double perovskites. Angew Chem Int Edit, 2017, 56: 12107 doi: 10.1002/anie.201705113
[21]	Vargas B, Ramos E, Perez-Gutierrez E, et al. A direct bandgap copper-antimony halide perovskite. J Am Chem Soc, 2017, 139: 9116 doi: 10.1021/jacs.7b04119
[22]	Xiao Z, Meng W, Wang J, et al. Searching for promising new perovskite-based photovoltaic absorbers: the importance of electronic dimensionality. Mater Horiz, 2017, 4: 206 doi: 10.1039/C6MH00519E
[23]	Volonakis G, Haghighirad A A, Milot R L, et al. Cs₂InAgCl₆: a new lead-free halide double perovskite with direct band gap. J Phys Chem Lett, 2017, 8: 772 doi: 10.1021/acs.jpclett.6b02682
[24]	Yin W J, Chen H Y, Shi T T, et al. Origin of high electronic quality in structurally disordered CH₃NH₃PbI₃ and the passivation effect of Cl and O at grain boundaries. Adv Electron Mater, 2015, 1: 1500044 doi: 10.1002/aelm.201500044
[25]	Yin W J, Shi T T, Yan Y F. Unique properties of halide perovskites as possible origins of the superior solar cell performance. Adv Mater, 2014, 26: 4653 doi: 10.1002/adma.v26.27
[26]	Yin W J, Shi T T, Yan Y F. Unusual defect physics in CH₃NH₃PbI₃ perovskite solar cell absorber. Appl Phys Lett, 2014, 104: 063903 doi: 10.1063/1.4864778
[27]	Yin W J, Yang J H, Kang J, et al. Halide perovskite materials for solar cells: a theoretical review. J Mater Chem A, 2015, 3: 8926 doi: 10.1039/C4TA05033A
[28]	Meng W, Wang X, Xiao Z, et al. Parity-forbidden transitions and their impact on the optical absorption properties of lead-free metal halide perovskites and double perovskites. J Phys Chem Lett, 2017, 8: 2999 doi: 10.1021/acs.jpclett.7b01042
[29]	Volonakis G, Haghighirad A A, Snaith H J, et al. Route to stable lead-free double perovskites with the electronic structure of CH₃NH₃PbI₃: a case for mixed-cation [Cs/CH₃NH₃/ CH(NH₂)₂]₂InBiBr₆. J Phys Chem Lett, 2017, 8: 3917-3924 doi: 10.1021/acs.jpclett.7b01584
[30]	Du K Z, Meng W, Wang X, et al. Bandgap engineering of lead-free double perovskite Cs₂AgBiBr₆ through trivalent metal alloying. Angew Chem Int Ed Engl, 2017, 56: 8158 doi: 10.1002/anie.v56.28
[31]	Tran T T, Panella J R, Chamorro J R, et al. Designing indirect–direct bandgap transitions in double perovskites. Mater Horiz, 2017, 4: 688 doi: 10.1039/C7MH00239D

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Received: 01 November 2017 Revised: 16 November 2017 Online: Accepted Manuscript: 10 February 2018Uncorrected proof: 12 April 2018Published: 01 July 2018

Article Navigation > Journal of Semiconductors > 2018 > 39(7): 071003

Zhenzhu Li, Wanjian Yin. Recent progress in Pb-free stable inorganic double halide perovskites[J]. Journal of Semiconductors, 2018, 39(7): 071003. doi: 10.1088/1674-4926/39/7/071003 ****Z Z Li, W J Yin, Recent progress in Pb-free stable inorganic double halide perovskites[J]. J. Semicond., 2018, 39(7): 071003. doi: 10.1088/1674-4926/39/7/071003.

Citation:

Zhenzhu Li, Wanjian Yin. Recent progress in Pb-free stable inorganic double halide perovskites[J]. Journal of Semiconductors, 2018, 39(7): 071003. doi: 10.1088/1674-4926/39/7/071003 ****

Z Z Li, W J Yin, Recent progress in Pb-free stable inorganic double halide perovskites[J]. J. Semicond., 2018, 39(7): 071003. doi: 10.1088/1674-4926/39/7/071003.

Citation:

Zhenzhu Li, Wanjian Yin. Recent progress in Pb-free stable inorganic double halide perovskites[J]. Journal of Semiconductors, 2018, 39(7): 071003. doi: 10.1088/1674-4926/39/7/071003 ****

Z Z Li, W J Yin, Recent progress in Pb-free stable inorganic double halide perovskites[J]. J. Semicond., 2018, 39(7): 071003. doi: 10.1088/1674-4926/39/7/071003.

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Recent progress in Pb-free stable inorganic double halide perovskites

doi: 10.1088/1674-4926/39/7/071003

Zhenzhu Li^1,2,
Wanjian Yin^1,2,

1.
Soochow Institute for Energy and Materials InnovationS (SIEMIS), College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China
2.
Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies, Soochow University, Suzhou 215006, China

More Information

Corresponding author: Email: wjyin@suda.edu.cn
Received Date: 2017-11-01
Revised Date: 2017-11-16
Published Date: 2018-07-01

Abstract

Abstract

Although the power conversion efficiency (PCE) of CH₃NH₃PbI₃-based solar cells has achieved 22.1%, which is comparable to commercialized thin-film CdTe and Cu(In,Ga)Se₂ solar cells, the long-term stability is the main obstacle for the commercialization of perovskite solar cells. Recent efforts have been made to explore alternative inorganic perovskites, which were assumed to have better stability than organic-inorganic hybrid CH₃NH₃PbI₃. In this short review, we will keep up with experiments and summarize recent progresses of inorganic double halide perovskite, in particular to Cs₂AgBiBr₆, Cs₂AgInCl₆, Cs₂InBiBr₆ and their family members. We will also share our opinions on the promise of such class of materials.
- double perovskite,
- solar cell,
- Pb-free

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References(31)

References

[1]	Kojima A, Teshima K, Shirai Y, et al. Organometal halide perovskites as visible-light sensitizers for photovoltaic cells. J Am Chem Soc, 2009, 131: 6050 doi: 10.1021/ja809598r
[2]	Seo J, Noh J H, Seok S I, et al. Rational strategies for efficient perovskite solar cells. Acc Chem Res, 2016, 49: 562 doi: 10.1021/acs.accounts.5b00444
[3]	Grancini G, Roldan-Carmona C, Zimmermann I, et al. One-year stable perovskite solar cells by 2D/3D interface engineering. Nat Commun, 2017, 8: 15684 doi: 10.1038/ncomms15684
[4]	Noel N K, Stranks S D, Abate A, et al. Lead-free organic-inorganic tin halide perovskites for photovoltaic applications. Energy Environ Sci, 2014, 7: 3061 doi: 10.1039/C4EE01076K
[5]	Hao F, Stoumpos C C, Duyen Hanh C, et al. Lead-free solid-state organic–inorganic halide perovskite solar cells. Nat Photon, 2014, 8: 489 doi: 10.1038/nphoton.2014.82
[6]	Hanusch F C, Wiesenmayer E, Mankel E, et al. Efficient planar heterojunction perovskite solar cells based on formamidinium lead bromide. J Phys Chem Lett, 2014, 5: 2791 doi: 10.1021/jz501237m
[7]	Ju M G, Dai J, Ma L, et al. Lead-free mixed tin and germanium perovskites for photovoltaic application. J Am Chem Soc, 2017, 139: 8038 doi: 10.1021/jacs.7b04219
[8]	Giustino F, Snaith H J. Toward lead-free perovskite solar cells. ACS Energy Lett, 2016, 1: 1233 doi: 10.1021/acsenergylett.6b00499
[9]	Kojima N. Gold valence transition and phase diagram in the mixed-valence complexes, M₂ [(AuX₂)-X-I][(AuX₄)-X-III] (M = Rb, Cs; X = Cl, Br, and I). Bull Chem Soc Jpn, 2000, 73: 1445 doi: 10.1246/bcsj.73.1445
[10]	McClure E T, Ball M R, Windl W, et al. Cs₂AgBiX₆(X = Br, Cl): new visible light absorbing, lead-free halide perovskite semiconductors. Chem Mater, 2016, 28: 1348 doi: 10.1021/acs.chemmater.5b04231
[11]	Slavney A H, Hu T, Lindenberg A M, et al. A bismuth-halide double perovskite with long carrier recombination lifetime for photovoltaic applications. J Am Chem Soc, 2016, 138: 2138 doi: 10.1021/jacs.5b13294
[12]	Savory C N, Walsh A, Scanlon D O. Can Pb-free halide double perovskites support high-efficiency solar cells. Acs Energy Lett, 2016, 1: 949 doi: 10.1021/acsenergylett.6b00471
[13]	Filip M R, Hillman S, Haghighirad A A, et al. Band gaps of the lead-free halide double perovskites Cs₂BiAgCl₆ and Cs₂BiAgBr₆ from theory and experiment. J Phys Chem Lett, 2016, 7: 2579 doi: 10.1021/acs.jpclett.6b01041
[14]	Pan W C, Wu H D, Luo J J, et al. Cs₂AgBiBr₆ single-crystal X-ray detectors with a low detection limit. Nat Photon, 2017, 11: 726 doi: 10.1038/s41566-017-0012-4
[15]	Xiao Z, Meng W, Wang J, et al. Thermodynamic stability and defect chemistry of bismuth-based lead-free double perovskites. ChemSusChem, 2016, 9: 2628-2633 doi: 10.1002/cssc.201600771
[16]	Volonakis G, Filip M R, Haghighirad A A, et al. Lead-free halide double perovskites via heterovalent substitution of noble metals. J Phys Chem Lett, 2016, 7: 1254-9 doi: 10.1021/acs.jpclett.6b00376
[17]	Zhao X G, Yang D, Sun Y, et al. Cu–In halide perovskite solar absorbers. J Am Chem Soc, 2017, 139: 6718 doi: 10.1021/jacs.7b02120
[18]	Zhao X G, Yang J H, Fu Y, et al. Design of lead-free inorganic halide perovskites for solar cells via cation-transmutation. J Am Chem Soc, 2017, 139: 2630 doi: 10.1021/jacs.6b09645
[19]	Xiao Z, Du K Z, Meng W, et al. Intrinsic instability of Cs₂In(I)M(III)X₆ (M = Bi, Sb; X = Halogen) double perovskites: a combined density functional theory and experimental study. J Am Chem Soc, 2017, 139: 6054-6057 doi: 10.1021/jacs.7b02227
[20]	Xiao Z, Du K Z, Meng W, et al. Chemical origin of the stability difference between copper(I)- and silver(I)-based halide double perovskites. Angew Chem Int Edit, 2017, 56: 12107 doi: 10.1002/anie.201705113
[21]	Vargas B, Ramos E, Perez-Gutierrez E, et al. A direct bandgap copper-antimony halide perovskite. J Am Chem Soc, 2017, 139: 9116 doi: 10.1021/jacs.7b04119
[22]	Xiao Z, Meng W, Wang J, et al. Searching for promising new perovskite-based photovoltaic absorbers: the importance of electronic dimensionality. Mater Horiz, 2017, 4: 206 doi: 10.1039/C6MH00519E
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Recent progress in Pb-free stable inorganic double halide perovskites

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Recent progress in Pb-free stable inorganic double halide perovskites

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Recent progress in Pb-free stable inorganic double halide perovskites

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