Band Edge Energies and Excitonic Transition Probabilities of Colloidal CsPbX<sub>3</sub> (X = Cl, Br, I) Perovskite Nanocrystals

Ravi, Vikash Kumar; Markad, Ganesh B.; Nag, Angshuman

doi:10.1021/acsenergylett.6b00337

Cited by 504 publications

(500 citation statements)

References 40 publications

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“…The CsPbBr 3 QDs have a much lower VB edge than the FAMAPbI 3 perovskite, which hinders hole transfer from the perovskite film to the HTM layer. In contrast, because the VBP of CsPbI 3 QDs is located between that of the HTM and the perovskite, more favorable energy-level alignment occurs at the interface, facilitating cascade hole extraction 33,34 . To further investigate the role of interface engineering in influencing the performance of the fabricated PSC devices, the PL spectra of perovskites without QDs, with CsPbI 3 QDs and with CsPbBr 3 QDs were measured.…”

Section: Resultsmentioning

confidence: 98%

Efficiency and stability enhancement of perovskite solar cells by introducing CsPbI3 quantum dots as an interface engineering layer

et al. 2018

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Although great efforts have been devoted to enhancing the efficiency and stability of perovskite solar cells (PSCs), the performance of PSCs has been far lower than anticipated. Interface engineering is helpful for obtaining high efficiency and stability through control of the interfacial charge transfer in PSCs. This paper demonstrates that the efficiency and stability of PSCs can be enhanced by introducing stable α-CsPbI 3 quantum dots (QDs) as an interface layer between the perovskite film and the hole transport material (HTM) layer. By synergistically controlling the valence band position (VBP) of the perovskite and the interface layer, an interface engineering strategy was successfully used to increase the efficiency of hole transfer from the perovskite to the HTM layer, resulting in the power conversion efficiency increasing from 15.17 to 18.56%. In addition, the enhancement of the stability of PSCs can be attributed to coating inorganic CsPbI 3 QDs onto the perovskite layer, which have a high moisture stability and result in long-term stability of the PSCs in ambient air.

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Section: Resultsmentioning

confidence: 98%

Efficiency and stability enhancement of perovskite solar cells by introducing CsPbI3 quantum dots as an interface engineering layer

et al. 2018

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“…This study of the spectroscopic properties of CsPb(Br0.65,I0.35)3 PNCs is complemented by X-ray photoemission spectroscopy, intended to probe the electronic spectrum on the absolute energy scale. 26 This work is of utmost importance to probe and quantify the Schottky barrier at the metal-PNC interface. Measurements were conducted at the TEMPO beamline of the SOLEIL synchrotron on PNC films prepared by following the same protocol used for transport studies at the device scale.…”

mentioning

confidence: 99%

Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays

Mir

Livache

Goubet

et al. 2018

Applied Physics Letters

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We discuss the transport properties of CsPbBrxI3−x perovskite nanocrystal arrays as a model ensemble system of caesium lead halide-based perovskite nanocrystal arrays. While this material is very promising for the design of light emitting diodes, laser, and solar cells, very little work has been devoted to the basic understanding of their (photo)conductive properties in an ensemble system. By combining DC and time-resolved photocurrent measurements, we demonstrate fast photodetection with time response below 2 ns. The photocurrent generation in perovskite nanocrystal-based arrays is limited by fast bimolecular recombination of the material, which limits the lifetime of the photogenerated electron-hole pairs. We propose to use nanotrench electrodes as a strategy to ensure that the device size fits within the obtained diffusion length of the material in order to boost the transport efficiency and thus observe an enhancement of the photoresponse by a factor of 1000.

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“…11 As shown in Figure 4, the VBM exhibited a large shift of 0.80 eV from −6.24 eV to −5.44 eV, whereas the CBM exhibited a smaller shift of 0.19 eV from −3.26 eV to −3.45 eV, when the nanocrystal composition was successively changed from CsPbCl 3 to CsPbI 3 through CsPbBr 3 and alloyed halides CsPb(Cl/Br) 3 and CsPb(Br/I) 3 . Thus, halides contributed more to the VBM than to the CBM, but their contribution to the latter was also not negligible.…”

Section: Properties Of Perovskite Cspbx 3 Nanocrystalsmentioning

confidence: 99%

Review—Synthesis, Luminescent Properties, and Stabilities of Cesium Lead Halide Perovskite Nanocrystals

Iso¹,

Isobe²

2017

ECS J. Solid State Sci. Technol.

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All-inorganic cesium lead halide perovskite CsPbX 3 (X = Cl, Br, I) nanocrystals have emerged as promising luminescent quantum dots. In this review, we summarize recent work on their synthesis, luminescent properties, and stabilities. Through controlling the composition of the alloyed halides and quantum size effects, the band gaps and emission wavelengths of CsPbX 3 nanocrystals are readily tunable over the entire visible range. Their sharp emission line-widths extend the color gamut of liquid crystal displays. They also exhibit high photoluminescence (PL) quantum yields and fast PL lifetimes. CsPbX 3 nanocrystals with both cubic and plate shapes have been successfully synthesized through several liquid-phase methods, such as hot-injection, room-temperature, and amine-free methods. The sizes and shapes of CsPbX 3 nanocrystals can be controlled via the reaction temperature and the length of the n-alkyl carboxylic acids and n-alkylamines used in their synthesis. Several attempts have been made to improve their stabilities during storage, at high temperature, and under light irradiation, for example by incorporation of CsPbX 3 nanocrystals into silica or polymer matrixes. In the liquid crystal display (LCD) industry, much research currently focuses on achieving the Rec. 2020 color gamut, which is the color standard for ultra-high-definition television broadcasting.1 An LCD backlight is composed of blue LEDs together with phosphors converting blue light to green and red. Extending the color gamut requires sharper emission spectra from the phosphors and finer tuning of their emission wavelengths. K 2 SiF 6 :Mn 4+ has attracted attention because of its sharp red-emission spectrum.2 In contrast, conventional green phosphors doped with rare earths suffer from low color purity. In recent years, LCD backlights based on quantum dots (QDs) with high color purity have been developed. QDs also possess color-tunable properties, because the bandgaps that determine their luminescent colors can be controlled through quantum size effects. Core/shell-type CdSe/ZnS QDs are widely used, but the high toxicity of cadmium and selenium is a major drawback. Alternatively, InP/ZnS QDs have been adopted in LCD backlights, but this solution suffers from the scarcity of indium and the sensitivity of InP to ambient O 2 and H 2 O. Very recently, CsPbX 3 (X = Cl, Br, I) nanocrystals have emerged as promising QDs.3 CsPbX 3 has crystal structure of cubic perovskite, as shown in Figure 1a. CsPbX 3 QDs are novel materials with many attractive photoluminescence (PL) properties, such as high quantum yields (QYs), narrow PL peaks, and emission colors that are controllable by halide anion exchange and quantum size effects. These properties make them potentially applicable in not only wide-colorgamut displays 3,4 (Figure 2), but also photovoltaic devices, 5 lasers, 6 photodetectors, 7 and bioimaging. 8 In this review, we introduce recent work on their synthesis, luminescent properties, and stabilities. Properties of Perovskite CsPbX 3 NanocrystalsHybrid...

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Band Edge Energies and Excitonic Transition Probabilities of Colloidal CsPbX₃ (X = Cl, Br, I) Perovskite Nanocrystals

Cited by 504 publications

References 40 publications

Efficiency and stability enhancement of perovskite solar cells by introducing CsPbI3 quantum dots as an interface engineering layer

Efficiency and stability enhancement of perovskite solar cells by introducing CsPbI3 quantum dots as an interface engineering layer

Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays

Review—Synthesis, Luminescent Properties, and Stabilities of Cesium Lead Halide Perovskite Nanocrystals

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Band Edge Energies and Excitonic Transition Probabilities of Colloidal CsPbX3 (X = Cl, Br, I) Perovskite Nanocrystals

Cited by 504 publications

References 40 publications

Efficiency and stability enhancement of perovskite solar cells by introducing CsPbI3 quantum dots as an interface engineering layer

Efficiency and stability enhancement of perovskite solar cells by introducing CsPbI3 quantum dots as an interface engineering layer

Strategy to overcome recombination limited photocurrent generation in CsPbX3 nanocrystal arrays

Review—Synthesis, Luminescent Properties, and Stabilities of Cesium Lead Halide Perovskite Nanocrystals

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Band Edge Energies and Excitonic Transition Probabilities of Colloidal CsPbX₃ (X = Cl, Br, I) Perovskite Nanocrystals