Layer-by-Layer Degradation of Methylammonium Lead Tri-iodide Perovskite Microplates

Zheng, Fan; Xiao, Hai; Wang, Yiliu; Zhao, Zipeng; Lin, Zhaoyang; Cheng, Horng Long; Lee, Sung‐Joon; Gong-ming, Wang; Feng, Ziying; Goddard, William A.; Yu, Hao; Duan, Xiangfeng

doi:10.1016/j.joule.2017.08.005

Cited by 236 publications

(230 citation statements)

References 63 publications

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“…Samples annealed at temperatures above 100°C turned yellow within a day while those exposed to temperatures below 80°C remained brown over the course of 96 h. The TRMC data shows a stable f m S up to roughly 70°C, and f m S falls for temperature 80°C. This temperature is in agreement with the phase transition temperature of MAPbI 3 [53,54]. As the temperature increases, the symmetry of crystalline structure increases and transforms to cubic near 350 K and MA cations become disordered [19,20,[55][56][57].…”

Section: Resultssupporting

confidence: 84%

Thermal stability of mobility in methylammonium lead iodide

et al. 2019

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Metal halide perovskites (MHPs) are a fascinating class of photovoltaic materials; possessing distinctive optoelectronic properties and simple processing routes. The most significant remaining barrier to commercialization is their poor stability under ambient conditions. While the stability of electronic parameters in this class of material has been studied extensively, to date the overwhelming majority of such studies have been carried out using PV devices. The presence of electrodes and transport layers in this approach involves both implicit encapsulation, and modification of interface properties. To develop an extensive understanding of environmental stability of electronic properties in MHPs, it is crucial to study the electronic properties of the material in isolation, rather than in a finished device. In this work, we have studied the thermal stability of electronic properties of solution processed methylammonium lead iodide (MAPbI 3 ). MAPbI 3 thin films were subjected to extended periods of elevated temperatures before their electronic properties were probed using time-resolved microwave conductivity (TRMC), a contactless technique enabling extraction of a proxy for the material's mobility, without the need to form a device. The films were analysed with x-ray absorption spectroscopy (XAS) to study the impact of temperature on film microstructure. We observed an increase in average Pb-I bond length with increased annealing temperature.

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Section: Resultssupporting

confidence: 84%

Thermal stability of mobility in methylammonium lead iodide

et al. 2019

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“…Zeng and co‐workers reported that large‐scale 2D CsPbX 3 perovskite nanoplatelets with a thickness as low as 1.7 nm can be produced and they demonstrated conspicuous optoelectronic performance as well as preferable stability. Recently, Fan et al revealed the atomistic mechanism for the degradation in perovskite microplates by in situ transmission electron microscope (TEM) observations combined with the density functional theory (DFT) simulations. It was confirmed that the surface reaction initiates layer‐by‐layer degradation pathway during the perovskite decomposition.…”

Section: Emergence Of 2d Metal‐halide Perovskitesmentioning

confidence: 99%

Photonics and Optoelectronics of 2D Metal‐Halide Perovskites

Zhang

et al. 2018

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In the growing list of 2D semiconductors as potential successors to silicon in future devices, metal-halide perovskites have recently joined the family. Unlike other conversional 2D covalent semiconductors such as graphene, transition metal dichalcogenides, black phosphorus, etc., 2D perovskites are ionic materials, affording many distinct properties of their own, including high photoluminescence quantum efficiency, balanced large exciton binding energy and oscillator strength, and long carrier diffusion length. These unique properties make 2D perovskites potential candidates for optoelectronic and photonic devices such as solar cells, light-emitting diodes, photodetectors, nanolasers, waveguides, modulators, and so on, which represent a relatively new but exciting and rapidly expanding area of research. In this Review, the recent advances in emerging 2D metal-halide perovskites and their applications in the fields of optoelectronics and photonics are summarized and insights into the future direction of these fields are offered.

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“…[ 111 ] Fan et al found that tetragonal phase MA‐based perovskite microplates evolve to trigonal phase PbI 2 layered crystals after heating up to 358 K, by tracking the process by using transmission electron microscopy. [ 112 ] As shown in Figure a,b, the initial square lattice phase ({400} planes) gradually degraded to a new trigonal phase ({210} planes) after the temperature increased to 358 K for 80 s. After 100 s, only one quarter of the tetragonal phase MAPbI 3 was left. The rest MAPbI 3 evolved to the trigonal phase PbI 2 as shown in Figure 2c.…”

Section: Stability Of Perovskite Materialsmentioning

confidence: 99%

“…Degradation of an individual MAPbI 3 grain under in situ heating (358 K) in dry air, and a pressure of 700 torr for a) 60 s, b) 80 s, and c) 100 s. [ 112 ] The perovskite grain which is indicated by purple dashed lines decreases as MAPbI 3 decays to PbI 2 . Insets: fast Fourier transform phase pictures of the relevant high‐resolution TEM images.…”

Section: Stability Of Perovskite Materialsmentioning

confidence: 99%

Stability of Perovskite Light Sources: Status and Challenges

Chen

Cui

et al. 2020

Advanced Optical Materials

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Stable perovskites light sources with long‐term stability are of great significance for future commercial applications. In this review, recent advances of the degradation models for perovskites and strategies for enhancing the stability of the corresponding light sources are summarized. Improving the stability and quality of perovskite materials is a common way for developing stable perovskite light sources. For strengthening the stability of perovskite light‐emitting diodes, approaches such as surface and interface engineering and employing more stable hole injection layers are effective. To enhance the stability of perovskite amplified spontaneous emission and lasers, methods such as protecting perovskites by materials with high intrinsic thermal conductivity and high stability, better thermal managements, and reducing the threshold carrier densities are useful. This work will be helpful for further prompting the performances, especially the stability of perovskite light sources in this fantastic field.

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Layer-by-Layer Degradation of Methylammonium Lead Tri-iodide Perovskite Microplates

Cited by 236 publications

References 63 publications

Thermal stability of mobility in methylammonium lead iodide

Thermal stability of mobility in methylammonium lead iodide

Photonics and Optoelectronics of 2D Metal‐Halide Perovskites

Stability of Perovskite Light Sources: Status and Challenges

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