Mixed cation hybrid lead halide perovskites with enhanced performance and stability

Xu, Feng; Zhang, Taiyang; Li, Ge; Zhao, Yixin

doi:10.1039/c7ta00042a

Cited by 171 publications

(138 citation statements)

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“…The typical 3D hybrid lead halide perovskite has the classical APbX 3 structure, and the tunable composition for A and X components offers perovskites sufficient freedom in tuning structures and properties [1,3,[14][15][16][17][18][19][20]. In particular, mixed-cation and mixed-halide perovskites have been an effective approach to optimize the properties of lead halide perovskites [5,21]. For example, the (FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 perovskite is a popular recipe used for solar cells with enhanced performance and stabilities [5].…”

Section: Introductionmentioning

confidence: 99%

CH3NH3Cl Assisted Solvent Engineering for Highly Crystallized and Large Grain Size Mixed-Composition (FAPbI3)0.85(MAPbBr3)0.15 Perovskites

Zhang

et al. 2017

Crystals

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High-quality mixed-cation lead mixed-halide (FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 perovskite films have been prepared using CH 3 NH 3 Cl additives via the solvent engineering method. The UV/Vis result shows that the addition of additives leads to enhanced absorptions. XRD and SEM characterizations suggest that compact, pinhole-free and uniform films can be obtained. This is attributable to the crystallization improvement caused by the CH 3 NH 3 Cl additives. The power conversion efficiency (PCE) of the F-doped SnO 2 (FTO)/compact-TiO 2 /perovskite/Spiro-OMeTAD/Ag device increases from 15.3% to 16.8% with the help of CH 3 NH 3 Cl additive.

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Section: Introductionmentioning

confidence: 99%

CH3NH3Cl Assisted Solvent Engineering for Highly Crystallized and Large Grain Size Mixed-Composition (FAPbI3)0.85(MAPbBr3)0.15 Perovskites

Zhang

et al. 2017

Crystals

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“…Though it might be difficult to direct synthesis the <111>‐orientated layered hybrid perovskites with single organic cation occupied on the A‐site due to the large tolerance factors . Nevertheless, it is still possible to stabilize the mixed organic–inorganic cations by entropy or structural compensation for postsynthesis modification of perovskites as the partial experimental evidence of these compositions . Thus we are confident in these new mixed‐cation perovskites to be synthesized by the developing technics such as sequential deposition, cation intercalation, or exchange reaction.…”

Section: Resultsmentioning

confidence: 98%

Design of Mixed‐Cation Tri‐Layered Pb‐Free Halide Perovskites for Optoelectronic Applications

Liu

Zhao

Zunger

et al. 2019

Adv Elect Materials

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the recorded photovoltaic (PV) efficiency is over 23% in the laboratory. [1,[4][5][6] Such merits for high-performance optoelectronics are governed by their unique electronic structure features, which can mainly be attributed to the ns 2 lone-pair electrons of Pb 2+ and Sn 2+ cations. [7,8] The presence of ns 2 cations in these perovskites gives rise to pronounced curvature in both valence and conduction band edges through considerable antibonding hybridization with the halide anions. This facilitates the formation of the shallow defect states to induce carriers, balanced and low electron and hole effective masses for efficient charge transport and carrier extraction. [8,9] Additionally, the enhanced Born effective charges (relative to nominal ionic charges) and large static dielectric constant contribute to screening charged defects and impurities, thereby suppressing carrier scattering and trapping. [7,10] Despite the progress achieved in halide perovskites for optoelectronic applications, the poor long-term material and device stability under normal operation condition impedes their commercialization, [4,11,12] though protecting active perovskite layers, [4,6,9] mixing organic and inorganic A site ions, [13,14] and exploiting low-dimensional counterparts have shown enhanced stability. [14][15][16] More importantly, at this stage it is not clear whether the toxic issue of Pb 2+ ions would hinder the practical device application of halide perovskites.In this regard, eco-friendly Bi 3+ -and Sb 3+ -based perovskites with the similar ns 2 electron configuration as Pb 2+ have attracted significant research interest. [17][18][19] Within the threedimensional (3D) perovskite framework formed by cornersharing octahedral motifs, lead-free double halide perovskites have been proposed by hetero-substituting Pb 2+ with the cation pair of monovalent metal (e.g., Na + , Ag + ) and trivalent metal (e.g., Sb 3+ , Bi 3+ , and In 3+ ) by exploiting the cation transmutation principle in conventional tetrahedral semiconductors. [20][21][22][23] It is worth noting that the predicted inorganic double perovskites, such as Cs 2 AgBiCl 6 , Cs 2 AgBiBr 6 , Cs 2 AgInCl 6 , have been experimentally proved more stable against decomposition under humidity and light emission. [21,22,24] However, these quaternary double perovskites exhibit weak light emission/absorption because of the indirect bandgap feature or the parity-forbidden band-edge transition. [21,24,25] While for the purely Sb 3+ -and Bi 3+ -based perovskites, they show enhanced air-stability but To eliminate the toxic Pb 2+ cation in hybrid halide perovskites, M′ 3+ cations of Bi/Sb-based layered halide perovskites are being increasingly investigated for optoelectronic applications. However, such M′ 3+ trivalent cations constrain the face-sharing bioctahedral or the bi-layered perovskites required to meet the charge neutrality condition. This usually gives rise to oversized indirect bandgaps and inferior carrier transport. Recent experiment suggested a mixed-cation tri-layered ha...

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“…Figure 5B includes the current density-voltage (J-V)curve of the champion PSC and the extracted performance parameters.N otably,t he short-circuit current density is as high as 26.4 mA cm À2 ,w hich is much higher than those in MAPbI 3 -orF APbI 3 -based PSCs (20 to 23 mA cm À2 )made by us, [4,21] and others. [6,7] This clearly demonstrates the advantage of the smaller bandgap in the (FAPbI 3 ) 0.7 (CsSnI 3 ) 0.3 HP. External quantum efficiency (EQE) spectrum in Figure 5C shows extended light capture in the near-infrared region (up to 960 nm) of the sunlight, and an integrated current density of 26.2 mA cm À2 ,w hich is consistent with the measured J SC .…”

Section: Angewandte Chemiementioning

confidence: 99%

“…[2] However,amongst all the popular HPs,the pure FAPbI 3 HP has the lowest bandgap (E g )o fa pproximately 1.48 eV, [3,4] which is still larger than the ideal E g of approximately 1.3 eV predicted for maximum-PCE singlejunction solar cells based on the Shockley-Queisser limit. [6][7][8] In order to achieve single-junction PSCs with the highest attainable PCE, it is necessary to explore new HP materials with the ideal bandgap. [6][7][8] In order to achieve single-junction PSCs with the highest attainable PCE, it is necessary to explore new HP materials with the ideal bandgap.…”

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confidence: 99%

“…[5] Hybridization/alloying of FAPbI 3 HP with larger-bandgap HPs such as MAPbI 3 ,M APbBr 3 ,C sPbI 3 ,R bPbI 3 ,a nd/or FAPbBr 3 invariably widens the bandgap,a lthough this has resulted in PSCs with improved real-device PCE and stability. [6][7][8] In order to achieve single-junction PSCs with the highest attainable PCE, it is necessary to explore new HP materials with the ideal bandgap. [9,10] There have been ah andful of tantalizing reports in this direction in the literature,w hich involve the exploration of MAPb 1Àx Sn x I 3 and/or FAPb 1Àx Sn x I 3 HPs.…”

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Homogenous Alloys of Formamidinium Lead Triiodide and Cesium Tin Triiodide for Efficient Ideal‐Bandgap Perovskite Solar Cells

et al. 2017

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The alloying behavior between FAPbI 3 and CsSnI 3 perovskites is studied carefully for the first time,which has led to the realization of single-phase hybrid perovskites of (FAPbI 3 ) 1Àx (CsSnI 3 ) x (0 < x < 1) compositions with anomalous bandgaps.( FAPbI 3 ) 1Àx (CsSnI 3 ) x perovskites exhibit stable,h omogenous composition/microstructure at the nanoscale,asconfirmed by microscopic characterization. The ideal bandgap of 1.3 eV for single-junction solar cell operation is achieved in the rationally-tailored (FAPbI 3 ) 0.7 (CsSnI 3 ) 0.3 -composition perovskite. Solar cells based on this new perovskite show power conversion efficiency up to 14.6 %. Figure 5. A) Schematic representation of the device architecture of the (FAPbI 3 ) 0.7 (CsSnI 3 ) 0.3 HP-based PSC used in this study.B )Current density (J)-voltage( V)c urve, C) external quantum efficiency (EQE) spectrum, and D) stabilizedm aximum-power-point current/power output, of the champion (FAPbI 3 ) 0.7 (CsSnI 3 ) 0.3 HP-based PSC.

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Mixed cation hybrid lead halide perovskites with enhanced performance and stability

Abstract: The mixed cation lead halide perovskite solar cells exhibited improved performance and enhanced stabilities.

Cited by 171 publications

References 116 publications

CH3NH3Cl Assisted Solvent Engineering for Highly Crystallized and Large Grain Size Mixed-Composition (FAPbI3)0.85(MAPbBr3)0.15 Perovskites

CH3NH3Cl Assisted Solvent Engineering for Highly Crystallized and Large Grain Size Mixed-Composition (FAPbI3)0.85(MAPbBr3)0.15 Perovskites

Design of Mixed‐Cation Tri‐Layered Pb‐Free Halide Perovskites for Optoelectronic Applications

Homogenous Alloys of Formamidinium Lead Triiodide and Cesium Tin Triiodide for Efficient Ideal‐Bandgap Perovskite Solar Cells

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