High-Stable X-ray Imaging from All-Inorganic Perovskite Nanocrystals under a High Dose Radiation

Yang, Liuli; Zhang, Hao; Zhou, Min; Zhao, Lei; Chen, Weiqing; Wang, Ting; Yu, Xue; Zhou, Dacheng; Qiu, Jianbei; Xu, Xuhui

doi:10.1021/acs.jpclett.0c02570

Cited by 46 publications

(56 citation statements)

References 28 publications

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“…Alternatively, the purified PQDs can be reconstructed via a solution‐protected annealing approach, in which the surface Br vacancies of CsPbBr 3 QDs can be effectively compensated in a ligand‐rich solution environment (a mixture of ODE, OA, and OAm) at 353 K, leading to a doubled PLQY value from 36.9% to 72.0%. [ 161 ]…”

Section: Photovoltaics and Optoelectronic Applicationsmentioning

confidence: 99%

Surface Chemistry Engineering of Perovskite Quantum Dots: Strategies, Applications, and Perspectives

et al. 2021

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The presence of surface ligands not only plays a key role in keeping the colloidal integrity and non‐defective surface of metal halide perovskite quantum dots (PQDs), but also serves as a knob to tune their optoelectronic properties for a variety of exciting applications including solar cells and light‐emitting diodes. However, these indispensable surface ligands may also deteriorate the stability and key properties of PQDs due to their highly dynamic binding and insulating nature. To address these issues, a number of innovative surface chemistry engineering approaches have been developed in the past few years. Based on an in‐depth fundamental understanding of the surface atomistic structure and surface defect formation mechanism in the tiny nanoparticles, a critical overview focusing on the surface chemistry engineering of PQDs including advanced colloidal synthesis, in‐situ surface passivation, and solution‐phase/solid‐state ligand exchange is presented, after which their unprecedented achievements in photovoltaics and other optoelectronics are presented. The practical hurdles and future directions are critically discussed to inspire more rational design of PQD surface chemistry toward practical applications.

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Section: Photovoltaics and Optoelectronic Applicationsmentioning

confidence: 99%

Surface Chemistry Engineering of Perovskite Quantum Dots: Strategies, Applications, and Perspectives

et al. 2021

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“…For indirect-type X-ray detection, large area scintillator screens based on CsPbBr 3 PNCs have been fabricated that exhibited a high resolution of 9.8 lp mm -1 and long-term radiostability in X-ray imaging. [27][28][29][30][31] However, the severe photon reabsorption in thick PNC films caused by the small Stokes shift between the absorption and emission spectrum (Figure 1a and S1, Supporting Information) impairs the light yield and hence the detection efficiency drastically. [32,33] Meanwhile, for direct-type X-ray conversion, a sensitivity of 1450 µC Gy air −1 cm −2 has been achieved in PNC based soft X-ray detectors with only 0.1 V bias voltage.…”

Section: Tuning the Photon Sensitization Mechanism In Metal-halide-pe...mentioning

confidence: 99%

“…[7] The indirect-type detectors are composed of visible photodetectors coupled with scintillator screen which converts high-energy photons into visible ones. [8][9][10] Recently, metal halide perovskites (MHPs) have bloomed as immensely promising candidates for percolating network behaves as the charge transport channel while the embedded PNCs work as the X-ray photon sensitizers. The nanocomposite thick films were prepared via the scalable spray coating method as the photon active layer, and the sensitization mechanism can be readily tuned from indirect-to directtype X-ray conversion via simply modulating the ligand density on the PNCs, which significantly increased the sensitivity of the devices by nearly one order of magnitude to 5 696 µC Gy air -1 cm -2 .…”

Section: Introductionmentioning

confidence: 99%

Tuning the Photon Sensitization Mechanism in Metal‐Halide‐Perovskite‐Based Nanocomposite Films Toward Highly Efficient and Stable X‐Ray Detection

Wei

Tao

et al. 2022

Advanced Optical Materials

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Metal halide perovskites (MHPs) have emerged as promising X‐ray detection materials. However, most MHP‐based X‐ray detectors are incompatible for large‐area preparation and integration, and suffer from the serious ion migration issue. This work demonstrates a “perovskite‐in‐a‐host” nanocomposite structure for X‐ray detection, by embedding the perovskite nanocrystal (PNC) sensitizers in the organic interpenetrating charge transport channels to work as the X‐ray attenuation layer. Intriguingly, the photon sensitization mechanism can be readily tuned from indirect‐ to direct‐type X‐ray conversion by decreasing the ligand density on the PNC surface, which significantly increases the sensitivity to 5 696 µC Gyair–1 cm–2. Besides, the ion migration gets suppressed due to the ion blocking effect of the surrounding organic phase. Therefore, an ultra‐small dark current relative drift of 3.57 × 10–9 cm s–1 V–1 is achieved even under an extremely large electric field up to 5 100 V cm–1, ensuring a low detection limit down to 72 nGyair s–1. The superior sensitivity and biasing stability enable the high performance X‐ray imaging capability of the devices, which exhibit great potential in scaling up and integration for the flat panel imaging.

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“…In addition, it is worth noticing that all-inorganic single junction devices offer interesting potential applications in high impact optoelectronics. Examples include photodetectors for gamma and X-rays detection, [107][108][109][110][111] scintillators, [112][113][114][115] photocatalysts, [116][117][118][119] and light emitting devices, [120][121][122][123] offering a plethora of new attractive solutions.…”

Section: Concluding Remarks and Future Perspectivesmentioning

confidence: 99%

All‐Inorganic Cesium‐Based Hybrid Perovskites for Efficient and Stable Solar Cells and Modules

Montecucco

Quadrivi

Pò

et al. 2021

Advanced Energy Materials

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high defect tolerance, long carrier diffusion length, and compatibility toward scalable manufacturing processes to name a few. [2][3][4][5][6][7] However, hybrid perovskites face severe degradation issues under operative conditions, which stem from the (photo) chemical instability when exposed to moisture, oxygen, UV light, and heat. [8][9][10][11][12] Among other reasons, the presence of the hydrophobic organic cation, e.g., methylammonium, can accelerate the degradation path. [12][13][14] For this reason, a greater focus has been devoted to exploring inorganic elements to replace the organic cations, for instance, using cesium to form CsPbX 3 all-inorganic perovskites. This system has been revealed of particular interest especially for the improved thermal stability of the material and, consequently, the enhanced device lifetime. [13] CsPbI 3 and CsPbBr 3 are the most studied materials within this class, with a rapid boost of their use for highly efficient solar cells, reaching 19.03% in 2019. [15] However, the PCE of CsPbX 3 -based devices are still lower than their organic-inorganic counterparts and far from the Shockley-Queisser limit calculated for their bandgap. [16] Therefore, major efforts are required to stabilize the CsPbI 3 structure and to fabricate high quality CsPbX 3 thin films, before upscaling the manufacturing toward marketable devices. In this work, we provide a compelling perspective on the most recent and innovative strategies to tackle this challenge. The structural and optoelectronic properties of CsPbX 3 materials are first sorted out, with a focus on the film morphology, crystal structure, and phase transitions of each system. Second, methods for improving the photovoltaic performances and the stability of CsPbX 3 -based devices are reported, focusing on the highest PCE and the longest device lifetimes reported up to date. Finally, we provide a perspective on the state of the art and future challenges for the upscaling of all-inorganic perovskite modules.

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High-Stable X-ray Imaging from All-Inorganic Perovskite Nanocrystals under a High Dose Radiation

Cited by 46 publications

References 28 publications

Surface Chemistry Engineering of Perovskite Quantum Dots: Strategies, Applications, and Perspectives

Surface Chemistry Engineering of Perovskite Quantum Dots: Strategies, Applications, and Perspectives

Tuning the Photon Sensitization Mechanism in Metal‐Halide‐Perovskite‐Based Nanocomposite Films Toward Highly Efficient and Stable X‐Ray Detection

All‐Inorganic Cesium‐Based Hybrid Perovskites for Efficient and Stable Solar Cells and Modules

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