Surface Termination, Morphology, and Bright Photoluminescence of Cesium Lead Halide Perovskite Nanocrystals

Brinck, Stephanie ten; Infante, Ivan

doi:10.1021/acsenergylett.6b00595

Cited by 208 publications

(264 citation statements)

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“…Since the electronic structure calculations are essential to understand with atomistic detail the optoelectronic properties of nanomaterials, [117,118] more efforts should be focused on the theoretical studies related to fully-inorganic perovskites NCs.…”

Section: Electronic Structuresmentioning

confidence: 99%

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

2017

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All-inorganic trihalide perovskite nanocrystals (NCs) are emerging as a new class of superstar semiconductors with excellent optoelectronic properties and great potential for a broad range of applications in lighting, lasing, photon detection, and photovoltaics. This article provides an up-to-date review on the developments of fully-inorganic trihalide perovskite NCs by emphasizing their controllable solution fabrication strategies, structural phase transformation, tunable optoelectronic properties, stability, as well as their photovoltaic and optoelectronic applications. Among the properties to be surveyed, particular focus is on the size-, shape-, and composition-dependent photoluminescence properties. Finally, by identifying new challenges, suggestions are provided for further research and potential development of this area.

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Section: Electronic Structuresmentioning

confidence: 99%

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

2017

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“…Although lead halide perovskites have a high defect tolerance compared to conventional semiconductor NCs (ie, CdSe, InP), the presence of typical defects such as undesirable cation or anion vacancies tends to cause trapped energy levels that fall within the CB (conduction band) and VB (valence band). This leads to a significant loss in carrier radiative recombination . These defects may deteriorate the short‐range order of the lattice and act as trapping centers of photo‐generated carriers, such as vacancies or distorted [PbX 6 ] octahedra on the surface and inside the perovskite.…”

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

“…The presence of chlorine causes a large number of defects in perovskite QDs compared to pure bromine analogues . The cation or anion vacancies tend to trap energy between the CB and VB, resulting in a nonradiative recombination process . The ligand passivation strategy introduced into CsPbBr 3 QDs was reported by Li et al in order to increase PL efficiency.…”

Section: Component Engineering For Blue‐emissive Perovskitesmentioning

confidence: 99%

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

Fang

Zhang

Yuan

et al. 2019

InfoMat

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Perovskite based light‐emitting diodes (PeLEDs) have become a powerful candidate for next‐generation solid‐state lightings and high‐definition displays due to their high photoluminescence quantum yield (PLQY), tunable emission wavelength over the visible spectrum, and narrow emission linewidths. Over the past few years, the development of red‐ and green‐emissive PeLEDs has rapidly increased, and the corresponding external quantum efficiencies (EQE) have exceeded 20%. However, the research progress of blue‐emitting PeLEDs is limited by its poor material quality and inappropriate device structure. Currently, the maximum EQE of blue PeLED is only 6.2%, which is far from the industrialization requirements. In order to promote the development of blue PeLEDs, we summarize the recent research progress of blue perovskite materials and LEDs and discuss several fatal challenges, mainly embodied in low efficiency and poor stability. In order to overcome these challenges, detailed analysis and strategies are put forward in terms of the materials and devices. For the former, we summarize the feasible strategy for the preparation of efficient and stable blue‐emissive perovskites using component engineering. For the latter, we analyze the advantages and limitations of the different strategies for blue‐emissive perovskite in LEDs. At the end of the review, a comprehensive outlook is detailed, including future development directions and several technical problems to be solved. Thus, we aim to highlight the significance and promote the industrialization of PeLEDs.

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“…Swarnkar et al first described the formation of α-CsPbI 3 QD films that are phase-stable for months under ambient condition and fabricated perovskite QD solar cells with an open-circuit voltage (V OC ) of 1.23 V and efficiency of 10.77%. [9,46,47] Therefore, further understanding of the ligand exchange process during CsPbI 3 QD solar cell fabrication and improving charge transport between QDs are still very important. [41] In comparison with the thin-film CsPbI 3 solar cells, [36][37][38] the short-circuit current density (J SC ) of CsPbI 3 QD solar cells is still lagging, [40][41][42] which may be attributed to the insufficient charge transport caused by residual of the insulating surface ligands.…”

mentioning

confidence: 99%

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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Surface Termination, Morphology, and Bright Photoluminescence of Cesium Lead Halide Perovskite Nanocrystals

Cited by 208 publications

References 35 publications

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

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

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Surface Termination, Morphology, and Bright Photoluminescence of Cesium Lead Halide Perovskite Nanocrystals

Cited by 208 publications

References 35 publications

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Fully‐Inorganic Trihalide Perovskite Nanocrystals: A New Research Frontier of Optoelectronic Materials

Recent advances and prospects toward blue perovskite materials and light‐emitting diodes

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

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Product

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About

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