Shape and phase evolution from CsPbBr3 perovskite nanocubes to tetragonal CsPb2Br5 nanosheets with an indirect bandgap

Li, Guopeng; Wang, Hui; Zhu, Zhifeng; Chang, Yajing; Zhang, Ting; Song, Zihang; Jiang, Yang

doi:10.1039/c6cc05877a

Cited by 214 publications

(257 citation statements)

References 39 publications

(39 reference statements)

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“…The CsPb 2 Br 5 microsheets had an absorption spectrum that was dominated by sharp exciton peaks, as similar to the optical features of previously reports [24,27]. Furthermore, the absorption intensity was lower than the orthorhombic CsPbBr 3 , further suggesting that the CsPb 2 Br 5 microsheets were successfully obtained [28]. The absorption spectrum (blue line) exhibited an absorption peak at around 495 nm, yielding an excitonic bandgap of about 2.50 eV [30,31].…”

Section: Resultssupporting

confidence: 57%

“…Wang et al reported a new type of highly luminescent perovskite-related CsPb 2 Br 5 nanoplatelets via a facile precipitation reaction [27]. Jiang's group synthesized tetragonal CsPb 2 Br 5 nanosheets which was an indirect bandgap semiconductor [28]. However, there are few corresponding applications which have been further referred up to now for this kind of excellent materials.…”

Section: Introductionmentioning

confidence: 99%

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All-Inorganic Perovskite CsPb2Br5 Microsheets for Photodetector Application

Tang

Han

et al. 2018

Front. Phys.

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Lead-halide perovskites have emerged as one kind of important optoelectronic materials with excellent performance in photovoltaic and light-emitting diode applications. Herein, we reported all-inorganic perovskite CsPb 2 Br 5 microsheets prepared by a facile injection method. Through the X-ray diffraction (XRD) and Scanning Electron Microscope (SEM), it could be seen that the CsPb 2 Br 5 microsheets showed single tetragonal crystalline phase and kept uniform square shape. Moreover, the as-synthesized CsPb 2 Br 5 microsheets exhibited photoluminescence emission at 513 nm, and the UV-vis absorption spectrum further indicated the band gap of CsPb 2 Br 5 microsheets was ≈2.50 eV. Additionally, the as-fabricated CsPb 2 Br 5 microsheets based photodetector exhibited faster photoresponse characteristics of short rise time (0.71 s) and decay time (0.60 s), which demonstrated its promising application as high performance electronic and optoelectronic devices.

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Section: Resultssupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

All-Inorganic Perovskite CsPb2Br5 Microsheets for Photodetector Application

Tang

Han

et al. 2018

Front. Phys.

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“…Now the applications of CsPb 2 Br 5 include laser and light-emitting devices [22][23][24]. Compared with the perovskite CsPbBr 3 , the available research on the structure and physical properties of the tetragonal CsPb 2 Br 5 is not very sufficient and many great blanks need to be filled [21]. Our results offer a facile way to synthesize CsPb 2 Br 5 , which could enlighten other researchers to develop and design more applications of CsPb 2 Br 5 .…”

Section: Introductionmentioning

confidence: 98%

“…S3, the light absorption peaks of these films are shorter thañ 375 nm. Combining the previous reports [21,22,25] and the fact that no PbBr 2 residual could be found in D-10 films, we hypothesize the reaction route according to the equation: CsBr+2PbBr 2 →CsPb 2 Br 5 . Then, CsPb 2 Br 5 continues to react with CsBr in methonal according to the equation: CsPb 2 Br 5 +CsBr→2CsPbBr 3 .…”

Section: Characterizationmentioning

confidence: 99%

“…The advantages of CsPb 2 Br 5 used in optoelectronic devices lie in the intrinsic sandwiched structure and physical properties from the structure. In the tetragonal CsPb 2 Br 5 structure, one layer of Cs ions is sandwiched between two layers of Pb-Br coordination polyhedrons [21]. Now the applications of CsPb 2 Br 5 include laser and light-emitting devices [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Sequential deposition method fabricating carbonbased fully-inorganic perovskite solar cells

Ding

Ren

et al. 2017

Sci. China Mater.

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Hybrid organic-inorganic halide perovskite material has been considered as a potential candidate for various optoelectronic applications. However, their high sensitivity to the environment hampers the actual application. Hence the technology replacing the organic part of the hybrid solar cells needs to be developed. Herein, we fabricated fullyinorganic carbon-based perovskite CsPbBr 3 solar cells via a sequential deposition method with a power conversion efficiency of 2.53% and long-time stability over 20 d under ambient air conditions without any encapsulation. An evolution process from tetragonal CsPb 2 Br 5 to CsPb 2 Br 5 -CsPbBr 3 composites to quasi-cubic CsPbBr 3 was found, which was investigated by scanning electron microscopy, X-ray diffraction spectra, UV-vis absorption spectra and Fourier transform infrared spectroscopy. Detailed evolution process was studied to learn more information about the formation process before 10 min. Our results are helpful to the development of inorganic perovskite solar cells and the CsPb 2 Br 5 based optoelectronic devices.

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Ultrastable and Reversible Fluorescent Perovskite Films Used for Flexible Instantaneous Display

Tan

et al. 2019

Adv Funct Materials

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All-inorganic halide perovskite materials are regarded as promising materials in information display applications owing to their tunable color, narrow emission peak, and easy processability. However, the photoluminescence (PL) stability of halide perovskite films is still inferior due to their poor thermal stability and hygroscopic properties. Herein, all-inorganic perovskite films are prepared through vacuum thermal deposition method to enhance thermal and hygroscopic stability. By intentionally adding extra bromide source, a structure of CsPbBr 3 nanocrystals embedded in a CsPb 2 Br 5 matrix (CsPbBr 3 /CsPb 2 Br 5 ) is formed via an air exposure process, leading to impressive PL stability in ambient atmosphere. In addition, the as-fabricated CsPbBr 3 /CsPb 2 Br 5 structure shows enhanced PL intensity due to the dielectric confinement. The CsPbBr 3 /CsPb 2 Br 5 structure film can almost reserve its initial PL intensity after four months, even stored in ambient atmosphere. The PL intensity for CsPbBr 3 /CsPb 2 Br 5 films vanishes at elevated temperature and recovers by cooling down in a short time. The reversible PL conversion process can be repeated over hundreds of times. Based on the reversible PL property, prototype thermal-driven information display devices are demonstrated by employing heating circuits on flexible transparent substrates. These robust perovskite films with reversible PL characteristics promise an alternative solid-state emitting display.

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Shape and phase evolution from CsPbBr₃ perovskite nanocubes to tetragonal CsPb₂Br₅ nanosheets with an indirect bandgap

Cited by 214 publications

References 39 publications

All-Inorganic Perovskite CsPb2Br5 Microsheets for Photodetector Application

All-Inorganic Perovskite CsPb2Br5 Microsheets for Photodetector Application

Sequential deposition method fabricating carbonbased fully-inorganic perovskite solar cells

Ultrastable and Reversible Fluorescent Perovskite Films Used for Flexible Instantaneous Display

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