Properties and potential optoelectronic applications of lead halide perovskite nanocrystals

Kovalenko, Maksym V.; Proteşescu, Loredana; Bodnarchuk, Maryna I.

doi:10.1126/science.aam7093

Cited by 1,955 publications

(1,759 citation statements)

References 51 publications

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“…Their unique nanostructures are also extensively studied as to structural crystal growth, characterization, phase transition, etc. [11,12] The formation of 2D nanoplates by atomic connection of smaller crystals is an important growth process in morphology, [13,14] which also finds great applications in 2D optoelectronic devices. [11,12] The formation of 2D nanoplates by atomic connection of smaller crystals is an important growth process in morphology, [13,14] which also finds great applications in 2D optoelectronic devices.…”

Section: Doi: 101002/advs201802202mentioning

confidence: 99%

Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration

Cheng

Lian

et al. 2019

Advanced Science

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The growth of nanocrystals has widely been researched recently through an in situ high‐resolution transmission electron microscopy technique, which reveals the process of morphological and structural evolutions. For nanocrystals, the underlying growth modes are mostly determined by growth environment and crystal morphology. Here, the direct growth process of the PbSe nanocrystals via controlling the temperature is clearly observed. The results show that the PbSe nanocrystals start growth following oriented attachment growth mode, and then change to growth with grain boundary migration at moderate temperature as the heat activated nanocrystals gather together with decreased degree of freedom for crystal rotation. During the grain boundary migration, the smaller nanocrystals are inclined to be assimilated by larger ones through interfacial atom reconfigurations, which are observed to take place through strain mediated atom migration. The growth mode changes in different growth states with a hybrid growth mode of oriented attachment and grain boundary migration during the whole growth process.

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Section: Doi: 101002/advs201802202mentioning

confidence: 99%

Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration

Cheng

Lian

et al. 2019

Advanced Science

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“…2019, 9,1900721 the shift of peak positions to lower binding energy can also be observed in both Pb 4f and I 3d core level spectra after CsAc treatment. [51,52] Herein, through CsAc post-treatment of the CsPbI 3 QD film, we witnessed an increased Cs + /I − ratio from XPS characterization, indicating the Cs vacancies in QD film were effectively filled. Thus, we further calculated the CsPbI 3 QD composition changes upon the CsAc treatment based on the XPS results.…”

mentioning

confidence: 94%

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Ling

Zhou

Yuan

et al. 2019

Advanced Energy Materials

291

284

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During the past decade, inorganic CQDs, namely the lead chalcogenides (e.g., PbS), have attracted tremendous attention in solution-processed solar cells. Due to the great efforts on CQDs synthesis modification, [7][8][9] surface passivation, [10][11][12] and device fabrication optimization, [13][14][15][16] PbS QD solar cells continue to progress at an extraordinary rate, improving overall efficiencies by ≈1% per year and currently have a certified power conversion efficiency (PCE) exceeding 12%. [17] Meanwhile, the past decade has witnessed unprecedented success of organicinorganic hybrid perovskites in PV applications, with the reported PCE of perovskite solar cells exceeding 23%. [18][19][20][21][22][23][24][25][26][27][28] However, the challenging stability issues of these hybrid perovskites further motivate the research of all-inorganic perovskites (CsPbX 3 , X = Cl − , Br − , I − or mixed halides) without any volatile organic components. [29][30][31][32][33][34][35][36][37][38] Among these all-inorganic perovskite materials, α-CsPbI 3 exhibits an ideal optical bandgap (E g ) of 1.73 eV for PV applications. However, the nonphotoactive orthorhombic phase (E g = 2.82 eV) is more thermodynamically preferred at low temperature. [29] Therefore, the perovskite phase of CsPbI 3 usually requires complex annealing processes at high temperature to achieve satisfactory film quality. As mentioned above, QD technology offers colloidal synthesis of conventional bulk materials, which Surface manipulation of quantum dots (QDs) has been extensively reported to be crucial to their performance when applied into optoelectronic devices, especially for photovoltaic devices. In this work, an efficient surface passivation method for emerging CsPbI 3 perovskite QDs using a variety of inorganic cesium salts (cesium acetate (CsAc), cesium idodide (CsI), cesium carbonate (Cs 2 CO 3 ), and cesium nitrate (CsNO 3 )) is reported. The Cs-salts post-treatment can not only fill the vacancy at the CsPbI 3 perovskite surface but also improve electron coupling between CsPbI 3 QDs. As a result, the free carrier lifetime, diffusion length, and mobility of QD film are simultaneously improved, which are beneficial for fabricating high-quality conductive QD films for efficient solar cell devices. After optimizing the post-treatment process, the short-circuit current density and fill factor are significantly enhanced, delivering an impressive efficiency of 14.10% for CsPbI 3 QD solar cells. In addition, the Cs-salt-treated CsPbI 3 QD devices exhibit improved stability against moisture due to the improved surface environment of these QDs. These findings will provide insight into the design of high-performance and low-trap-states perovskite QD films with desirable optoelectronic properties. Perovskite Quantum DotsThe ORCID identification number(s) for the author(s) of this article can be found under https://doi.Solution-processed colloidal quantum dots (CQDs) are promising candidates for the next generation photovoltaics (PVs) due to the excellent tuna...

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“…[6] Although trichromatic sources could give good CRI values, obtaining the green emissive phosphors with the merits including high photoluminescence quantum yield (PL QY) and low cost is still a challenge. [12][13][14][15][16][17][18][19][20][21] The high quantum efficiency, high color purity, and facile preparation make them as promising candidates for LED or backlight downconverters for LCDs. Recently, cesium lead halide perovskite quantum dots (PQDs) CsPbX 3 (X = Cl, Br, I) with outstanding optical performances are the focus of considerable research efforts.…”

Section: Introductionmentioning

confidence: 99%

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF₂ Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes

Wei

Xiao

Xie

et al. 2018

Advanced Optical Materials

117

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Lead halide perovskite quantum dots (PQDs) have been widely recognized as highly luminescent materials for efficient optoelectronic applications owing to their fascinating electronic and optical properties. In spite of the excellent performances for the fabrication of lighting devices, the poor chemical instability greatly hampers their practical applications. The inevitable ion exchange and degradation driven from light, moisture, heat, and others limits their applications such as solid‐state light‐emitting diodes (LEDs). In this paper, the stability of PQDs is improved by integrating them in CaF2 hierarchical nanospheres (HNSs). In comparison with the pristine perovskite materials, the outstanding optical performances are well preserved. The perovskite displays a unique quantum confinement effect in the HNSs. Additionally, embedding the quantum dots in robust CaF2 matrices protects them from being damaged by moisture or light irradiation as well as anion exchange. Furthermore, white LED devices are obtained by mixing green CaF2‐CsPbBr3 composites and commercial red phosphors on a blue chip. The optimized devices show a high luminous efficacy of 62.7 lm W–1 under 20 mA current and preserve the value of 56.3 lm W–1 after working for 8 h.

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Properties and potential optoelectronic applications of lead halide perovskite nanocrystals

Cited by 1,955 publications

References 51 publications

Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration

Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration

14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF₂ Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes

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Properties and potential optoelectronic applications of lead halide perovskite nanocrystals

Cited by 1,955 publications

References 51 publications

Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration

Hybrid Growth Modes of PbSe Nanocrystals with Oriented Attachment and Grain Boundary Migration

14.1% CsPbI3 Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF2 Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes

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Resources

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14.1% CsPbI₃ Perovskite Quantum Dot Solar Cells via Cesium Cation Passivation

Highly Luminescent Lead Halide Perovskite Quantum Dots in Hierarchical CaF₂ Matrices with Enhanced Stability as Phosphors for White Light‐Emitting Diodes