Photostability and Photodegradation Processes in Colloidal CsPbI<sub>3</sub> Perovskite Quantum Dots

An, Rui; Zhang, Fengying; Zou, Xianshao; Tang, Yingying; Liang, Mingli; Oshchapovskyy, I. V.; Liu, Yuchen; Honarfar, Alireza; Zhong, Yunqian; Li, Chuanshuai; Geng, Huifang; Chen, Junsheng; Canton, Sophie E.; Pullerits, Tõnu; Zheng, Kaibo

doi:10.1021/acsami.8b14480

Cited by 134 publications

(122 citation statements)

References 31 publications

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“…By contrast, the k nr value first increases slightly due to the increasing number of defects caused by the heterovalent doping, [48] but then gradually decreases when the x value is over 3.5%, which could be ascribed to the reduction of surface metallic Pb 0 defect states as shown in the XPS results (see Figure 1c). [34] It is believed that the introduction of shallow energy levels and curing of the intrinsic structural disorder are the main reasons of improved PLQY in Cd 2+ and Mg 2+ doped CsPbCl 3 . [14,19,49] We find that the radiative recombination rate k r exhibits a more significant change according to the PL decay while the nonradiative recombination rate k nr only experiences a slight change.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Blue‐Emitting CsPbBr₃ Perovskite Nanocrystals through Neodymium Doping

et al. 2020

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Colloidal CsPbX 3 (X = Br, Cl, and I) perovskite nanocrystals exhibit tunable bandgaps over the entire visible spectrum and high photoluminescence quantum yields in the green and red regions. However, the lack of highly efficient blue-emitting perovskite nanocrystals limits their development for optoelectronic applications. Herein, neodymium (III) (Nd 3+) doped CsPbBr 3 nanocrystals are prepared through the ligand-assisted reprecipitation method at room temperature with tunable photoemission from green to deep blue. A blue-emitting nanocrystal with a central wavelength at 459 nm, an exceptionally high photoluminescence quantum yield of 90%, and a spectral width of 19 nm is achieved. First principles calculations reveal that the increase in photoluminescence quantum yield upon doping is driven by an enhancement of the exciton binding energy due to increased electron and hole effective masses and an increase in oscillator strength due to shortening of the Pb-Br bond. Putting these results together, an all-perovskite white light-emitting diode is successfully fabricated, demonstrating that B-site composition engineering is a reliable strategy to further exploit the perovskite family for wider optoelectronic applications.

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Section: Resultsmentioning

confidence: 99%

Highly Efficient Blue‐Emitting CsPbBr₃ Perovskite Nanocrystals through Neodymium Doping

et al. 2020

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“…[ 39,45 ] However, the capping reagents are easily removed, resulting in surface defects and degradation of PQDs. [ 46 ] It is expected that through interaction between nonfullerene Lewis base and the Pb ion Lewis acid, nonfullerene acceptors could stabilize the PQDs in case of detachment of the capping reagents.…”

Section: Figurementioning

confidence: 99%

“…For neat FOIC, the peaks at 1699 and 2217 cm ‐1 are attributed to the symmetric stretching vibrations of CO and CN bonds, respectively. [ 42 ] For neat PQDs, the peaks at 1379 and 1468 cm ‐1 are attributed to antisymmetric and symmetric stretching vibrations of COO − , and the peak at 1641 cm ‐1 is assigned to the N–H bending vibration, [ 46 ] which indicated that the PQDs have caping reagents coming from precursors (oleic acid and oleylamine). We normalized the peak at 1540 cm ‐1 (stretching vibrations of CC bonds) of FOIC and FOIC:PQDs blend in order to distinguish the differences between them.…”

Section: Figurementioning

confidence: 99%

High‐Efficiency Perovskite Quantum Dot Hybrid Nonfullerene Organic Solar Cells with Near‐Zero Driving Force

et al. 2020

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To take advantages of the intense absorption and fluorescence, high charge mobility, and high dielectric constant of CsPbI3 perovskite quantum dots (PQDs), PQD hybrid nonfullerene organic solar cells (OSCs) are fabricated. Addition of PQDs leads to simultaneous enhancement of open‐circuit voltage (VOC), short‐circuit current density (JSC), and fill factor (FF); power conversion efficiencies are boosted from 11.6% to 13.2% for PTB7‐Th:FOIC blend and from 15.4% to 16.6% for PM6:Y6 blend. Incorporation of PQDs dramatically increases the energy of the charge transfer state, resulting in near‐zero driving force and improved VOC. Interestingly, at near‐zero driving force, the PQD hybrid OSCs show more efficient charge generation than the control device without PQDs, contributing to enhanced JSC, due to the formation of cascade band structure and increased molecular ordering. The strong fluorescence of the PQDs enhances the external quantum efficiency of the electroluminescence of the active layer, which can reduce nonradiative recombination voltage loss. The high dielectric constant of the PQDs screens the Coulombic interactions and reduces charge recombination, which is beneficial for increased FF. This work may open up wide applicability of perovskite quantum dots and an avenue toward high‐performance nonfullerene solar cells.

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“…Mixing 2D/3D perovskites also produced passivation of the traps and protection toward humidity. [32] We believe that the surface passivation of perovskites with another semiconductor shell is a particularly promising approach to increase the stability of perovskites under continuous irradiation. [31] In general, mixing different cation and anions seems to improve the structural stability of perovskites and prevents undesired phase transitions.…”

Section: The Challengesmentioning

confidence: 99%

Research Frontiers in Energy‐Related Materials and Applications for 2020–2030

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Galian

Mureşan

et al. 2020

Advanced Sustainable Systems

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structure was found for the first time in a mineral composed by CaTiO 3 in 1839. Since then, multiple metal oxide perovskites (AMO 3 ) were developed, which have interesting properties for ferroelectric, superconductive, and pyroelectric applications. Metal halide perovskites (X is a halide anion such as Cl − , Br − , or I − ), which were developed later, display promising semiconducting properties. In particular, lead halide perovskites (APbX 3 ) are the most widely studied perovskite composition and are classified according to the A cation into hybrid perovskites (methylammonium bromide, MA or formamidinium, FA) and all-inorganic perovskites (cesium, Cs). [2] The electronic properties of the perovskites are related to the M-X bond, while the size of the A cation can introduce crystal distortion and change the symmetry of the ideal cubic crystal structure. [3] Interestingly, by using a large A organic cation, low-dimensional halide perovskites can be formed, including 2D sheets, 1D chains, or 0D clusters. [4] Lead halide perovskites are revolutionizing photovoltaic technology thank to their outstanding optical and electronic properties, low cost, and simple preparation. Compared to silicon-based technology, perovskites are prepared from more abundant and low-cost precursors. The superior performance and high efficiency of perovskite-based solar cells (PSC) are due to i) high optical absorption coefficient, ii) long carrier diffusion length This article delineates the state of the art for several materials used in the harvest, conversion, and storage of energy, and analyzes the challenges to be overcome in the decade ahead for them to reach the market and benefit society. The materials covered have had a special interest in recent years and include perovskites, materials for batteries and supercapacitors, graphene, and materials for hydrogen production and storage. Looking at the common challenges for these different systems, scientists in basic research should carefully consider commercial requirements when designing new materials. These include cost and ease of synthesis, abundance of precursors, recyclability of spent devices, toxicity, and stability. Improvements in these areas deserve more attention, as they can help bridge the gap for these technologies and facilitate the creation of partnerships between academia and industry. These improvements should be pursued in parallel with the design of novel compositions, nanostructures, and devices, which have led most interest during the past decade. Research groups are encouraged to adopt a cross-disciplinary mindset, which may allow more efficient use of existing knowledge and facilitate breakthrough innovation in both basic and applied research of energy-related materials.

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Photostability and Photodegradation Processes in Colloidal CsPbI₃ Perovskite Quantum Dots

Cited by 134 publications

References 31 publications

Highly Efficient Blue‐Emitting CsPbBr₃ Perovskite Nanocrystals through Neodymium Doping

Highly Efficient Blue‐Emitting CsPbBr₃ Perovskite Nanocrystals through Neodymium Doping

High‐Efficiency Perovskite Quantum Dot Hybrid Nonfullerene Organic Solar Cells with Near‐Zero Driving Force

Research Frontiers in Energy‐Related Materials and Applications for 2020–2030

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Photostability and Photodegradation Processes in Colloidal CsPbI3 Perovskite Quantum Dots

Cited by 134 publications

References 31 publications

Highly Efficient Blue‐Emitting CsPbBr3 Perovskite Nanocrystals through Neodymium Doping

Highly Efficient Blue‐Emitting CsPbBr3 Perovskite Nanocrystals through Neodymium Doping

High‐Efficiency Perovskite Quantum Dot Hybrid Nonfullerene Organic Solar Cells with Near‐Zero Driving Force

Research Frontiers in Energy‐Related Materials and Applications for 2020–2030

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Photostability and Photodegradation Processes in Colloidal CsPbI₃ Perovskite Quantum Dots

Highly Efficient Blue‐Emitting CsPbBr₃ Perovskite Nanocrystals through Neodymium Doping

Highly Efficient Blue‐Emitting CsPbBr₃ Perovskite Nanocrystals through Neodymium Doping