In-situ X-ray diffraction reveals the degradation of crystalline CH3NH3PbI3 by water-molecule collisions at room temperature

Hada, Masaki; Hasegawa, Yoichi; Nagaoka, Ryota; Miyake, Tomoya; Abdullaev, Ulugbek; Ota, Hiromi; Nishikawa, Takeshi; Yamashita, Yoshifumi; Hayashi, Yasuhiro

doi:10.7567/jjap.57.028001

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…The diffraction peaks of 14.17 and 28.5° are assigned to the (110) and (220) lattice planes of the perovskite phase, respectively, and are indicated by stars in Figure c,d. Two other peaks appear at 13.81 and 27.69° for the nonperovskite phase and are indicated by ☆ . Further increasing the substrate temperature results in the emergence of perovskite phases with strong XRD diffraction peaks for all the samples and a gradual decrease in the nonperovskite phase content.…”

Section: Resultsmentioning

confidence: 89%

Tuning the Interactions of Methylammonium Acetate with Acetonitrile to Create Efficient Perovskite Solar Cells

Sun

Wang

et al. 2021

J. Phys. Chem. C

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The elucidation of intermolecular interactions for the systematic control of nucleation and crystallization is key to produce perovskite photovoltaics with superior performance. In this study, we added a weak coordination solvent acetonitrile (ACN) to an ionic liquid precursor solution and studied the effect of ACN on the coordination environment of Pb2+ in the precursor solution and determined the role of ACN in perovskite nucleation and the crystallization process. The addition of ACN was found to reduce the coordination between the solvent and perovskite solutes (CH3COO–···Pb2+), which facilitated the formation of large micelles by sharing halogens. More importantly, the strong hydrogen bond interaction between organic cations and ACN (CH3–NH3 +···CH3CN) slowed the growth of perovskite crystals to produce a compact and smooth thin film. MAPbI2.8Br0.2-based solar cells based on intermolecular interaction tuning achieved a high-power conversion efficiency of over 21% with long-term stability for over 1500 h. The results of this study demonstrate that the performance of perovskite photovoltaic devices can effectively be improved by adjusting the chemical environment of various components of the precursor solution.

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Section: Resultsmentioning

confidence: 89%

Tuning the Interactions of Methylammonium Acetate with Acetonitrile to Create Efficient Perovskite Solar Cells

Sun

Wang

et al. 2021

J. Phys. Chem. C

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“…Previously, we reported the degradation processes of MAPbI 3 using in situ XRD measurements. 22 We have revealed the number of collisions required between the MAPbI 3 lattice and water molecules to induce the degradation reaction. In the present study, we determined the activation energy of the degradation process of MAPbI 3 caused by interaction with water molecules from the temperature dependence of the in situ XRD measurements.…”

mentioning

confidence: 95%

“…( 1)] is the most important for the loss of power-conversion efficiency. Our previous study 22 reported that the rate constant (s 1 ) of the chemical reaction in Eq. ( 1) was 18 min at a temperature of 26 C and that multiple collisions (1/g ¼ 1.8 Â 10 9 , where g is the collision yield) between the water molecules and crystalline MAPbI 3 are required to degrade the material.…”

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confidence: 99%

A mechanistic investigation of moisture-induced degradation of methylammonium lead iodide

Hada

Asad

Misawa

et al. 2020

Applied Physics Letters

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We performed in situ x-ray diffraction (XRD) experiments on an inorganic-organic hybrid perovskite, CH 3 NH 3 PbI 3 (MAPbI 3 ), during its interaction with moisture to understand the degradation mechanism. Although the degradation of inorganic-organic hybrid perovskite is an important factor hampering their development as solar cell materials, understanding of the degradation process is currently limited. The moisture-induced degradation mechanism was revealed by the temperature dependence of the in situ XRD pattern sequences and firstprinciples calculations based on the nudged elastic band method. The combination of experimental and computational data suggests that the MAPbI 3 crystal spontaneously changes into the MAPbI 3 mono-hydrate crystal once water molecules activated with an energy of more than $0.6 eV penetrate the (100) outer surface of the MAPbI 3 lattice. These findings have important implications for the development of more robust inorganic-organic hybrid perovskites as light absorbing layers in solar cells and other applications.

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Processing Halide Perovskite Materials with Semiconductor Technology

Cheng

Zhu

Huang

et al. 2019

Adv Materials Technologies

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Semiconductor technologies make major contributions to scientific and technological improvements, enabling high‐performance and low‐cost devices, chips, and systems. Photolithography technologies are at the heart of semiconductor technologies and are indispensable in fabricating microstructures and nanostructures. It is obvious that a new emerging material can play a greater role in economic development if it can be processed with photolithography technologies. Halide perovskites have received an enormous amount of attention, as they are useful in photonic and optoelectronic applications due to their strong optical absorption, tunable direct bandgap, and long electron–hole diffusion length. However, photolithography technologies cannot be utilized to fabricate semiconductor devices based on halide perovskite materials because water, a solvent for all halide perovskite materials, is used in the fabrication process. Here, the process compatibility between halide perovskite materials and semiconductor technology is realized with the help of parylene, a kind of polymer. A photodetector based on MAPbI3 and a memristor based on CsPbBr3 fabricated with photolithography technologies are both demonstrated successfully for the first time. This study not only paves the way toward the fabrication of halide perovskite devices with semiconductor technologies but also provides a powerful tool for the in‐depth study of halide perovskite materials.

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In-situ X-ray diffraction reveals the degradation of crystalline CH₃NH₃PbI₃ by water-molecule collisions at room temperature

Cited by 8 publications

References 24 publications

Tuning the Interactions of Methylammonium Acetate with Acetonitrile to Create Efficient Perovskite Solar Cells

Tuning the Interactions of Methylammonium Acetate with Acetonitrile to Create Efficient Perovskite Solar Cells

A mechanistic investigation of moisture-induced degradation of methylammonium lead iodide

Processing Halide Perovskite Materials with Semiconductor Technology

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