Fabrication of high quality perovskite films by modulating the Pb–O bonds in Lewis acid–base adducts

Cao, Xiaobing; Li, C. L.; Zhi, Lili; Li, Y. H.; Cui, Xin; Yao, Youwei; Ci, Lijie; Wei, Jinquan

doi:10.1039/c7ta00539c

Cited by 79 publications

(84 citation statements)

References 45 publications

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“…In the case of DMSO liquid, stretching vibration of S=O (ν(S=O)), appears at around 1045 cm À 1 . [19][20][21][22][23] S=O vibration peaks shift to the lower wavenumber to 1036, and 1033, and 1032 cm À 1 upon PbBr 2 -DMSO, PbBr 2 -DMSO-MABr, and PbBr 2 -DMSO-MA:CsBr interactions, confirming the adduct formations based on the Lewis acid-base mechanism. Similar frequency shifts are reported previously, indicating most of the DMSO takes part in complexation.…”

Section: Doping and Photon Induced Defect Healing Of Hybrid Perovskitmentioning

confidence: 83%

“…Having higher solubility of an organic salt (MAX, MA = Methylammonium, X=Cl, Br, I) than the lead halide (PbX 2 ) in polar solvents, results in the formation of lead halide complexes during thin films processing. [19][20][21][22][23][24][25] Besides, unreacted metallic Pb depicted in thin films acts as a PL quencher. [12,19,20,25] PL spectroscopic measurements have shown a significant change in the PLQY by varying excitation power.…”

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confidence: 99%

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Doping and Photon Induced Defect Healing of Hybrid Perovskite Thin Films: An Approach Towards Efficient Light Emitting Diodes

et al. 2019

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Here, we demonstrate a simple method to improve photoluminescence and electroluminescent properties of MAPbBr3 perovskite thin films by monovalent Cs cation doping and treatment with UV light. It is known that the intermediate species of lead halides, which limits the photoluminescence quantum yield (PLQY) of perovskite thin films, are formed due to the presence of an organic polar solvent. In such cases, coalescence of nanocrystals is unavoidable when the thin‐films are thermally annealed to remove the intermediate phases and solvent residues. We find that PbBr2(DMSO)x complexes can effectively tune the morphology, grain boundary, PLQY, and non‐radiative loss of perovskite thin films under UV light irradiation. Upon UV exposure, highly uniform MA0.87Cs0.13PbBr3 ultra‐thin (45 nm) films with a full surface coverage of neatly packed nanocrystallites are obtained. When these films are integrated into electroluminescent devices, a current efficiency (CE) of 18.71 Cd/A and an external quantum efficiency (EQE) of 5.63% are observed for green perovskite‐based light emitting diodes (PeLEDs). These values of CE and EQE are respectively thirty‐four and forty‐three times higher than those achieved in pure MAPbBr3 based devices.

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Section: Doping and Photon Induced Defect Healing Of Hybrid Perovskitmentioning

confidence: 83%

mentioning

confidence: 99%

Doping and Photon Induced Defect Healing of Hybrid Perovskite Thin Films: An Approach Towards Efficient Light Emitting Diodes

et al. 2019

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“…FTO glass (TEC7, Pilkington) was cleaned according to our previous report [22] , and then exposed to UV ozone at 150 °C for 15 min. A compact and mesoporous layer of TiO 2 was subsequently deposited on the cleaned FTO substrate by spin coating [22] . The perovskite films were fabricated using a sequential deposition process.…”

Section: Fabrication Of the Devicementioning

confidence: 99%

“…All the annealing processes were kept for 30 min at 100 °C. Afterward, a HTM layer was then deposited by spin-coating a solution prepared by a recipe reported previously [22] . Finally, a 60 nm-thick Au film evaporated on the top of HTM was used as a back electrode.…”

Section: Fabrication Of the Devicementioning

confidence: 99%

“…N -methyl-2-pyrrolidone (NMP) has a higher boiling point (203 °C) and lower volatility than those of DMF (152 °C) and DMSO (189 °C), which was also used for fabricating high quality perovskite films [19,20] . According to literature, the solvents, such as DMF, DMSO and NMP, can act as Lewis bases, which interact with Pb 2 + during the formation of perovskite through donating electron [21,22] . The electron-donating ability of the solvent is defined as donor number (DN), which is a quantitative measure of Lewis basicity [23,24] .…”

Section: Introductionmentioning

confidence: 99%

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Dissolution and recrystallization of perovskite induced by N-methyl-2-pyrrolidone in a closed steam annealing method

Zhi

et al. 2019

Journal of Energy Chemistry

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All‐Inorganic Perovskite Polymer–Ceramics for Flexible and Refreshable X‐Ray Imaging

Chen

Zhou

Liu

et al. 2021

Adv Funct Materials

103

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Halide perovskites are an emerging scintillator material for X-ray imaging. High-quality X-ray imaging generally requires high spatial resolution and long operation lifetime, especially for targeted objects with irregular shapes. Herein, a perovskite "polymer-ceramics" scintillator, in which the halide perovskite nanocrystals are grown inside a pre-solidified polymer structure with high viscosity (6 × 10 12 cP), is designed to construct flexible and refreshable X-ray imaging. A nucleation inhibition strategy is proposed to prevent the agglomeration and Ostwald ripening of perovskite crystals during the subsequent precipitation process, enabling a high-quality polymer-ceramics scintillator with high transparency. This scintillator-based detector achieves a detection limit of 120 nGy s -1 and a spatial resolution of 12.5 lp mm -1 . Interestingly, due to the anchoring effect of the exfoliated atoms provided by the polymer matrix, the scintillator film can be refreshed after a long duration (≥3 h) and high dose (8 mGy s -1 ) irradiation. More importantly, this inherent characteristic overcomes the long operation lifetime issue of perovskites-based scintillators. Hence, the authors' exploration of the polymer-ceramics scintillator paves the way for the development of flexible and durable perovskite scintillators that can be produced at a low operation cost.

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Fabrication of high quality perovskite films by modulating the Pb–O bonds in Lewis acid–base adducts

Abstract: The performance of perovskite solar cells is enhanced by modulating the Pb–O bond in a Lewis adduct via adding some strong Lewis bases into PbI2/DMF solutions.

Cited by 79 publications

References 45 publications

Doping and Photon Induced Defect Healing of Hybrid Perovskite Thin Films: An Approach Towards Efficient Light Emitting Diodes

Doping and Photon Induced Defect Healing of Hybrid Perovskite Thin Films: An Approach Towards Efficient Light Emitting Diodes

Dissolution and recrystallization of perovskite induced by N-methyl-2-pyrrolidone in a closed steam annealing method

All‐Inorganic Perovskite Polymer–Ceramics for Flexible and Refreshable X‐Ray Imaging

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