Hybrid Perovskites: Photophysics of Organic–Inorganic Hybrid Lead Iodide Perovskite Single Crystals (Adv. Funct. Mater. 16/2015)

Fang, Hong‐Hua; Raissa, Raissa; Abdu‐Aguye, Mustapha; Adjokatse, Sampson; Blake, Graeme R.; Even, Jacky; Loi, Maria Antonietta

doi:10.1002/adfm.201570107

Cited by 12 publications

(7 citation statements)

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“…However, lattice expansion in lead–halogen compounds reduces the VBM potential and slightly increases the CBM potential. Therefore, as we observed in this study, the lead–halide band gap underwent a blue shift as the temperature increased. , With additional coating layers and the introduction of the Al dopant, the magnitude of the blue shift with increasing temperature decreased. The large number of nonradiative traps on the QD surfaces caused extensive thermal quenching; therefore, the intensity of CsPbBr 3 QD PL gradually decreased with increasing temperature.…”

Section: Resultsmentioning

confidence: 99%

Stable Luminescence of CsPbBr₃/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification

Liu

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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Perovskite quantum dots (PQDs) are among the most important luminescent semiconducting materials; however, they are unstable. Exposure to light, heat, and air can lead to irreversible degradation, which results in fluorescence quenching. Therefore, defects in PQDs significantly limit their practical application. Herein, we describe a simple method to enhance the photostability of CsPbBr3/nCdS QDs, which involves doping their shells with aluminum. The temperature-dependent photoluminescence (PL) of colloidal CsPbBr3/nCdS/Al2O3 QDs is investigated, and the thermal quenching of PL, blue shift of the optical band gap, and PL line width broadening are observed in each QD sample. Al2O3 layers on the CsPbBr3/nCdS QDs can effectively prevent photodegradation. Nonlinear, temperature-dependent exciton–phonon coupling and lattice dilation leads to radiative and nonradiative relaxation processes at temperatures ranging from 10 to 300 K; moreover, changes in the band gap and PL spectral line broadening are observed.

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Section: Resultsmentioning

confidence: 99%

Stable Luminescence of CsPbBr₃/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification

Liu

Zhang

et al. 2019

ACS Appl. Mater. Interfaces

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“…In these compounds, the excitons possess larger binding energy due to quantum confinement effects, which displays excellent optical properties such as second harmonic generation, exciton absorption and emission [7][8][9][10][11]. These properties make organic inorganic hybrid perovskites great candidates for applications in solar cells [12], electroluminescent devices [13][14][15] and radiation detection [16].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Two-Photon Photoluminescence Properties of Organic Inorganic Hybrid Perovskites (C6H5CH2NH3)2PbBr4 and (C6H5CH2NH3)2PbI4

Liu

Han

et al. 2018

Applied Sciences

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Organic inorganic hybrid perovskites have potential applications in solar cells, electroluminescent devices and radiation detection because of their unique optoelectronic properties. In this paper, the perovskites (C6H5CH2NH3)2PbBr4 and (C6H5CH2NH3)2PbI4 were synthesized by solvent evaporation. The crystal structure, morphology, absorption spectrum, laser power dependence of the photoluminescence (PL) intensity and lifetime were studied. The results showed that the perovskites (C6H5CH2NH3)2PbBr4 and (C6H5CH2NH3)2PbI4 display a layered stacking structure of organic and inorganic components. The absorption peaks are located at 392 nm (3.16 eV) and 516 nm (2.40 eV), respectively. It was observed that the PL intensity and photoluminescence quantum yield (PLQY) increases with increasing laser power, and that the PL lifetime decreases with increasing laser power, which is mainly due to the non-geminate recombination.

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“…The phenomenal performance of organic–inorganic hybrid halide perovskite materials marks the dawn of a new era in solution-processed optoelectronics and photovoltaics. − Their remarkable power conversion efficiencies (PCEs) stem from unprecedented attributes, including their adjustable optical band gaps, − high absorption coefficients, long electron–hole diffusion lengths, high carrier mobilities, low surface recombination velocities, ambipolar charge transport characteristics, and economically competitive fabrication processes, that make them particularly suited to be solution-manufactured semiconductors. − These attributes have galvanized the use of organic–inorganic hybrid halide perovskite materials in applications from solar cells to bright light-emitting diodes, electrically and optically pumped lasing, color imaging, photodetectors, and phototransistors . Their remarkable photovoltaic properties , can be realized from highly ordered as well as low-density trap states .…”

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confidence: 99%

Surface Restructuring of Hybrid Perovskite Crystals

Murali

Dey

Abdelhady³

et al. 2016

ACS Energy Lett.

143

177

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Hybrid perovskite crystals have emerged as an important class of semiconductors because of their remarkable performance in optoelectronics devices. The interface structure and chemistry of these crystals are key determinants of the device’s performance. Unfortunately, little is known about the intrinsic properties of the surfaces of perovskite materials because extrinsic effects, such as complex microstructures, processing conditions, and hydration under ambient conditions, are thought to cause resistive losses and high leakage current in solar cells. We reveal the intrinsic structural and optoelectronic properties of both pristinely cleaved and aged surfaces of single crystals. We identify surface restructuring on the aged surfaces (visualized on the atomic-scale by scanning tunneling microscopy) that lead to compositional and optical bandgap changes as well as degradation of carrier dynamics, photocurrent, and solar cell device performance. The insights reported herein clarify the key variables involved in the performance of perovskite-based solar cells and fabrication of high-quality surface single crystals, thus paving the way toward their future exploitation in highly efficient solar cells.

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Hybrid Perovskites: Photophysics of Organic–Inorganic Hybrid Lead Iodide Perovskite Single Crystals (Adv. Funct. Mater. 16/2015)

Cited by 12 publications

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Stable Luminescence of CsPbBr₃/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification

Stable Luminescence of CsPbBr₃/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification

Preparation and Two-Photon Photoluminescence Properties of Organic Inorganic Hybrid Perovskites (C6H5CH2NH3)2PbBr4 and (C6H5CH2NH3)2PbI4

Surface Restructuring of Hybrid Perovskite Crystals

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Hybrid Perovskites: Photophysics of Organic–Inorganic Hybrid Lead Iodide Perovskite Single Crystals (Adv. Funct. Mater. 16/2015)

Cited by 12 publications

References 0 publications

Stable Luminescence of CsPbBr3/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification

Stable Luminescence of CsPbBr3/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification

Preparation and Two-Photon Photoluminescence Properties of Organic Inorganic Hybrid Perovskites (C6H5CH2NH3)2PbBr4 and (C6H5CH2NH3)2PbI4

Surface Restructuring of Hybrid Perovskite Crystals

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Stable Luminescence of CsPbBr₃/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification

Stable Luminescence of CsPbBr₃/nCdS Core/Shell Perovskite Quantum Dots with Al Self-Passivation Layer Modification