Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

Park, Young S.; Jana, Atanu; Myung, Chang Woo; Yoon, Taeseung; Lee, Geungsik; Kocher, Claudius; Ying, Guanhua; Osokin, Vitaly; Taylor, Robert A.; Kim, Kwang S.

doi:10.1007/s12274-020-2718-8

Cited by 12 publications

(5 citation statements)

References 58 publications

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“…[142] It is important to understand how to control the cooling characteristics process of HCs in MHPs with compositions, [22,25,137,138] dimensionality, [143] spin-orbit coupling, [10] and defects. [144]…”

Section: Slow Cooling Mechanism Of Hot Carriersmentioning

confidence: 99%

Challenges, Opportunities, and Prospects in Metal Halide Perovskites from Theoretical and Machine Learning Perspectives

Myung

Hajibabaei

Cha

et al. 2022

Advanced Energy Materials

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Metal halide perovskite (MHP) is a promising next generation energy material for various applications, such as solar cells, light emitting diodes, lasers, sensors, and transistors. MHPs show excellent mechanical, dielectric, photovoltaic, photoluminescence, and electronic properties, and such intriguing physical and chemical properties have drawn attention recently. However, there exists a chasm between the successful applications of MHPs and theoretical understandings. The difficulty arises from the intrinsic properties of MHPs, including structural disorder, ionic interactions, nonadiabatic effects, and composition diversity. Machine learning (ML) approaches have shown great promise as a tool to overcome the theoretical obstacles in many fields of science. In this perspective, the pending theoretical challenges from experiments are overviewed and promising ML approaches, including ab initio ML potentials, materials design/optimization models, and data mining strategies are proposed. Possible roles and pipelines of ML frameworks are highlighted to close the gap between experiment and theory in MHPs.

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Section: Slow Cooling Mechanism Of Hot Carriersmentioning

confidence: 99%

Challenges, Opportunities, and Prospects in Metal Halide Perovskites from Theoretical and Machine Learning Perspectives

Myung

Hajibabaei

Cha

et al. 2022

Advanced Energy Materials

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“…Organic–inorganic hybrid metal halide materials have attracted extensive attention as semiconductor materials with exceptional structure and adjustability of luminescent properties, including high absorption coefficient, high electron–phonon coupling coefficient, and high photoluminescence quantum yield (PLQY), which have a wide variety of optoelectronic applications, such as lasers, light-emitting diodes, thin-film transistors, etc. − Lead-based metal halide hybrids are usually used to understand luminescent materials with their high PLQY and tunable optical properties. − However, the lack of structural stability resisting long-term light, moisture, or high temperature and heavy metal lead toxicity to humans and the environment all limit its further real applications. − To overcome these problems, it is indispensable to obtain environmentally friendly stable organic–inorganic hybrid metal halide materials. Generally, using other inorganic materials instead of toxic lead materials and lowering the structural dimension can greatly reduce the toxicity and improve the stability, − respectively.…”

mentioning

confidence: 99%

Self-Trapped Exciton Emission in a Zero-Dimensional (TMA)₂SbCl₅·DMF Single Crystal and Molecular Dynamics Simulation of Structural Stability

Wei

Chang

Zeng

et al. 2021

J. Phys. Chem. Lett.

105

130

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Lead-free lower-dimensional organic−inorganic metal halide materials have recently triggered intense research because of their excellent photophysical properties and chemical stability. Herein, we report a novel zero-dimensional (0D) organic−inorganic hybrid single crystal (TMA) 2 SbCl 5 •DMF (TMA = N(CH 3 ) 3 , DMF= HCON(CH 3 ) 2 ), which exhibits typical selftrapped exciton (STE) emission with an efficient yellow emission at 630 nm and high photoluminescence quantum yield (PLQY) of 67.2%. The dual STE emission is attributed to the singlet and triplet STEs in inorganic [SbCl 5 ] 2− , respectively. Further, an ab initio molecular dynamics simulation was performed to estimate the stability of crystal structure at room temperature. The calculated excited-state structure indicates that the deformation parameter (Δd) of the excited-state structure is larger than that of the ground state, illustrating the origin of a large Stokes shift. These results indicate that these new 0D lead-free organic−inorganic hybrid metal halides are promising luminescent materials for optoelectronic applications.

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“…The E a of MAPbI 3 in the tetragonal phase is 20 meV and increases to 200 meV in the cubic phase [1], where [40] concludes the value around 150 K is 29 meV for MAPbI 3 and 38 meV for MAPbBr 3 . Another study calculated 65 meV for bulk [42] and 86.6 meV for a single crystal [43]. For CsPbBr 3 nanocrystals (NCs), E a is 63.9 meV and decreases with increases the size of NCs to be 54.7, 43 and 35 meV [44].…”

Section: Activation Energymentioning

confidence: 99%

Phase State Influence on Photoluminescence of MAPb(BrxI1−x)3 Perovskites towards Optimized Photonics Applications

et al. 2022

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Perovskite halide has many advantages that attracted the attention of researchers in the last years, but many challenges prevent the use of halide perovskites in different applications. One of these challenges is the low thermal stability resulting in phase transitions with temperatures. Here, the photoluminescence (PL) characteristics and related phase transitions of different CH3NH3Pb(BrxI1−x)3 (MA(BrxI1−x)3)3 perovskites structures have been investigated under a wide temperature range. The work that has been conducted demonstrates that under temperature, the exciton behavior of the halide anions, I and Br, has a considerable impact on structural phases and the fluorescence process. The obtained results for the temperature dependence of PL for MAPb(BrxI1−x)3 showed a wide range of emission wavelengths, between 500–800 nm with a decrease in PL intensity with increasing temperature. In addition, the ratio of both bromine and iodine in MAPb(BrxI1−x)3 affects the range of phase transition temperatures, where at x = 0.00, 0.25, and 0.50 the first transition occurs below room temperature (orthorhombic to tetragonal) phase and the other occurs above room temperature (tetragonal to cubic) phase. Furthermore, increasing the proportion of bromine causes all the transitions to occur below room temperature. The presented findings suggest a suitable halide component under a temperature-controlled phase transformation to benefit these materials in photonics devices.

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Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

Cited by 12 publications

References 58 publications

Challenges, Opportunities, and Prospects in Metal Halide Perovskites from Theoretical and Machine Learning Perspectives

Challenges, Opportunities, and Prospects in Metal Halide Perovskites from Theoretical and Machine Learning Perspectives

Self-Trapped Exciton Emission in a Zero-Dimensional (TMA)₂SbCl₅·DMF Single Crystal and Molecular Dynamics Simulation of Structural Stability

Phase State Influence on Photoluminescence of MAPb(BrxI1−x)3 Perovskites towards Optimized Photonics Applications

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Enhanced photoluminescence quantum yield of MAPbBr3 nanocrystals by passivation using graphene

Cited by 12 publications

References 58 publications

Challenges, Opportunities, and Prospects in Metal Halide Perovskites from Theoretical and Machine Learning Perspectives

Challenges, Opportunities, and Prospects in Metal Halide Perovskites from Theoretical and Machine Learning Perspectives

Self-Trapped Exciton Emission in a Zero-Dimensional (TMA)2SbCl5·DMF Single Crystal and Molecular Dynamics Simulation of Structural Stability

Phase State Influence on Photoluminescence of MAPb(BrxI1−x)3 Perovskites towards Optimized Photonics Applications

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Self-Trapped Exciton Emission in a Zero-Dimensional (TMA)₂SbCl₅·DMF Single Crystal and Molecular Dynamics Simulation of Structural Stability