Improved carriers injection capacity in perovskite solar cells by introducing A-site interstitial defects

Zhao, Pengjun; Yin, Wenping; Kim, Minwoo; Han, M.K.; Song, Young Jae; Ahn, Tae Kyu; Jung, Hyun Suk

doi:10.1039/c7ta01203a

Cited by 107 publications

(93 citation statements)

References 32 publications

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“…The diffraction peaks marked with the solid circle are arisen from the MAPbI 3 and the peaks with asterisk denote the diffraction peaks from new structure other than MAPbI 3 . Each of the patterns for MAPbI 3 is well consistent with that reported in previous studies ,. XRD of the pristine MAPbI 3 perovskite shows the most prominent peak at 14.28° corresponding to (110) crystalline plane of the tetragonal MAPbI 3 phase.…”

Section: Resultssupporting

confidence: 89%

Fabrication of Perovskite Uniform Film in Air via Introduction of Aniline Cations

et al. 2018

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Alkylammonium lead(II) halide (APbX3) perovskite is developed to be the most potential light absorbing material in the photovoltaic field. However it is sensitive to water and oxygen, and the perovskite uniform film is difficult to be prepared in atmospheric environment. Here, CH3NH3PbI3 perovskite uniform layer was prepared in ambient environment via adding aniline cations in the methylamine deposition solution of the perovskite layer. XRD results indicate 3D crystalline structure of CH3NH3PbI3 perovskite is remained in the case of addition of the low concentration of aniline cations. With the addition increasing of aniline cations, 2D crystalline structure of (C6H5‐NH3)2PbI4 is gradually formed. SEM images indicate that the introduction of aniline cations obviously improves the coverage of CH3NH3PbI3 perovskite on nanocrystalline TiO2 thin film. The short circuit photocurrent and power conversion efficiency of perovskite solar cell based on the mixed perovskite were enhanced. The perovskite solar cell fabricated with the optimized molar ratio of aniline cations shows a short circuit photocurrent density of 17.1 mA⋅cm−2 and power conversion efficiency of 5.7%, which is 28% higher than that of the device based on pure CH3NH3PbI3 perovskite. The photovoltaic performance enhancement of perovskite solar cell is due to the formation of perovskite uniform layer as aniline cations are introduced, which suppresses the possible recombination processes.

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Section: Resultssupporting

confidence: 89%

Fabrication of Perovskite Uniform Film in Air via Introduction of Aniline Cations

et al. 2018

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“…The UV‐vis absorption spectra of K‐MAPbBr 3 in Figure 1B show a slight blue shift compared with the MAPbBr 3 . Such blue shift should be attributed to the doping or alloying of K cation into MAPbBr 3 crystals as suggested by XRD pattern, which is in accordance with previous reports . The X‐ray photoelectron spectra (XPS) were investigated to further reveal the chemical states of MAPbBr 3 and K‐MAPbBr 3 .…”

Section: Resultssupporting

confidence: 88%

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Yue

Zhang

Yang

et al. 2020

EcoMat

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Various optoelectronic applications of organic inorganic hybrid lead halide perovskites are challenged by their stability. The photocatalytic stability of lead halide perovskites are so low that chemical stabilizer such as H3PO2 are required in their applications. We report a postsynthesis potassium stabilization on methylammonium lead bromide (MAPbBr3) to form K‐MAPbBr3 by doping K cation and depositing KBr layers. In absence of any stabilizer, this stable K‐MAPbBr3 perovskite can exhibit an unprecedented high photostability even after 200 hours continuous photocatalytic H2 generation. Impressively, the K‐MAPbBr3 cocatalyzed with Mo3S132− nanoclusters achieves a high apparent quantum efficiency up to 18.3% at 450 nm for photocatalytic H2 generation. The mechanism study reveals that the photogeneration of Pb0 and Br0 defects are effectively inhibited in K‐MAPbBr3, which makes it a robust photocatalyst for H2 generation. These findings will inspire the development of stable organic‐inorganic hybrid perovskites for photocatalysis and other optoelectronic applications.

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“…15,48 Here we investigate the simplest case of K 0.10 MA 0.90 PbI 3 . Figure 6a,b shows a comparison between 13 C and 14 N spectra of MAPbI 3 and K 0.10 MA 0.90 PbI 3 .…”

Section: Resultsmentioning

confidence: 99%

“…); 16 Rb x FA 1– x PbI 3 ( x = 0.1, 0.2, abbreviated as “Rb x FA 1-x ”); a Rb/Cs/MA/FA/Pb/Br/I material prepared according to Saliba et al (“RbCsMAFA(Br,I)”), 6 and K 0.10 MA 0.90 PbI 3 . 15 We also prepared the following materials with only iodine as counterion: Rb 0.05 Cs 0.10 FA 0.85 PbI 3 , Rb 0.05 MA 0.25 FA 0.70 PbI 3 , Rb 0.05 Cs 0.10 MA 0.25 FA 0.60 PbI 3 , abbreviated respectively as RbCsFA(I), RbMAFA(I), and RbCsMAFA(I). Further, we made the following compounds to use as references: δ-CsPbI 3 (yellow), δ-RbPbI 3 (yellow); Cs 0.5 Rb 0.5 PbI 3 (pale yellow); and RbPb 2 Br 5 (white).…”

Section: Experimental Sectionmentioning

confidence: 99%

Phase Segregation in Cs-, Rb- and K-Doped Mixed-Cation (MA)_x(FA)_1–xPbI₃ Hybrid Perovskites from Solid-State NMR

Kubicki¹,

Prochowicz

Hofstetter³

et al. 2017

J. Am. Chem. Soc.

340

439

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Hybrid (organic–inorganic) multication lead halide perovskites hold promise for a new generation of easily processable solar cells. Best performing compositions to date are multiple-cation solid alloys of formamidinium (FA), methylammonium (MA), cesium, and rubidium lead halides which provide power conversion efficiencies up to around 22%. Here, we elucidate the atomic-level nature of Cs and Rb incorporation into the perovskite lattice of FA-based materials. We use 133Cs, 87Rb, 39K, 13C, and 14N solid-state MAS NMR to probe microscopic composition of Cs-, Rb-, K-, MA-, and FA-containing phases in double-, triple-, and quadruple-cation lead halides in bulk and in a thin film. Contrary to previous reports, we have found no proof of Rb or K incorporation into the 3D perovskite lattice in these systems. We also show that the structure of bulk mechanochemical perovskites bears close resemblance to that of thin films, making them a good benchmark for structural studies. These findings provide fundamental understanding of previously reported excellent photovoltaic parameters in these systems and their superior stability.

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Improved carriers injection capacity in perovskite solar cells by introducing A-site interstitial defects

Abstract: A new strategy to enhance perovskite solar cell performance by introducing potassium cation (K+) as interstitial site defects.

Cited by 107 publications

References 32 publications

Fabrication of Perovskite Uniform Film in Air via Introduction of Aniline Cations

Fabrication of Perovskite Uniform Film in Air via Introduction of Aniline Cations

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Phase Segregation in Cs-, Rb- and K-Doped Mixed-Cation (MA)_x(FA)_1–xPbI₃ Hybrid Perovskites from Solid-State NMR

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Improved carriers injection capacity in perovskite solar cells by introducing A-site interstitial defects

Abstract: A new strategy to enhance perovskite solar cell performance by introducing potassium cation (K+) as interstitial site defects.

Cited by 107 publications

References 32 publications

Fabrication of Perovskite Uniform Film in Air via Introduction of Aniline Cations

Fabrication of Perovskite Uniform Film in Air via Introduction of Aniline Cations

Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H2 generation

Phase Segregation in Cs-, Rb- and K-Doped Mixed-Cation (MA)x(FA)1–xPbI3 Hybrid Perovskites from Solid-State NMR

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Potassium stabilization of methylammonium lead bromide perovskite for robust photocatalytic H₂ generation

Phase Segregation in Cs-, Rb- and K-Doped Mixed-Cation (MA)_x(FA)_1–xPbI₃ Hybrid Perovskites from Solid-State NMR