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16 results on '"Wang, Pengjiu"'

1. Enhanced Performance in Cesium Tellurium Chlorine by Hafnium Alloying for X‐Ray Computed Tomography Imaging.

Author

Lai, Jun'an, Wang, Pengjiu, Zheng, Baofeng, Xuan, Tongtong, Wu, Daofu, Wang, Zixian, Wang, Yijia, Zhang, Wenxia, Du, Juan, He, Peng, An, Kang, and Tang, Xiaosheng

Subjects
*COMPUTED tomography, *VISIBLE spectra, *SCINTILLATORS, *HAFNIUM, *ION emission, *CESIUM, *TELLURIUM
Abstract

The term "light yield" (LY) refers to the ability of scintillator materials to convert high‐energy radiation into visible light. A higher LY corresponds to improved energy and spatial resolution in detectors. The enhancement of scintillator material performance is a crucial aspect of their development. In this study, the Cs2TeCl6 (CTC) double perovskite microcrystals is synthesized, and the broadband yellow emission shows a high degree of matching with the Charge‐coupled Device (CCD). However, the LY of CTC is poor for practical applications in X‐ray imaging. The scintillation performance is significantly enhanced through hafnium alloying. The LY increased from ≈4167 to 38 523 photons/MeV, and the detection limit decreased from 948 to 258 nGy s−1. The underlying mechanism of Te4+ ions emission is systematically explored through density function theory (DFT) analysis, along with investigations into pressure‐dependent photoluminescence, temperature‐dependent photoluminescence, and low‐temperature thermoluminescence. Furthermore, a flexible X‐ray scintillator screen with an outstanding high spatial resolution of 15.9 lp mm−1 is successfully fabricated. This work not only represents a substantial advancement in the scintillation performance of Te4+ ions emission double perovskite microcrystals but also provides an effective strategy for the development of the next generation of halide scintillators. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Seed‐Assisted Growth of Methylammonium‐Free Perovskite for Efficient Inverted Perovskite Solar Cells

Author

Wang, Pengjiu, primary, Chen, Xu, additional, Liu, Tianyu, additional, Hou, Cheng‐Hung, additional, Tian, Yue, additional, Xu, Xuehui, additional, Chen, Zeng, additional, Ran, Peng, additional, Jiang, Tingming, additional, Kuan, Chun‐Hsiao, additional, Yan, Buyi, additional, Yao, Jizhong, additional, Shyue, Jing‐Jong, additional, Qiu, Jianbei, additional, and Yang, Yang (Michael), additional

Published
2022
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6. Conception de contacts oxydes et de pérovskites à cations mixtes pour des cellules solaires hautement efficaces

Author

Wang, Pengjiu, Institut de Recherche de Chimie Paris (IRCP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ministère de la Culture (MC), Université Paris sciences et lettres, and Thierry Pauporté

Subjects
Solar cells, Cellules solaires, Titanium dioxide, Photovoltaïque, Dioxyde de titane, Photovlatic, Perovskite, [CHIM.OTHE]Chemical Sciences/Other
Abstract

Perovskite-based solar cells (PSCs) have emerged as the most promising new generation of photovoltaic technology.Organometal trihalide perovskite solar cells (PSC) have aroused widespread academic and commercial interests due to rapid increase in efficiency, which has boosted from 3.8%4 in 2009 to 20.1%5 in 2014. These great achievements are mainly attributed to the unique characteristics of perovskite materials, such as low cost, high photo-to-electric conversion efficiency, high light absorption properties, direct bandgap, high charge- carrier mobility and long electron-hole exciton transport distance (more than 1 µm). 6-8 Perovskite material is soluble, which makes it quite easy and cheap to prepare perovskite solar cells.; Base perovskite-cellules solaires (CSP) ont émergé comme la nouvelle génération la plus prometteuse du photovoltaïque technology.Organometal trihalogénure perovskite cellules solaires (PSC) ont suscité intérêts académiques et commerciaux répandus en raison de rapide accroître l'efficacité, qui a stimulé de 3,8% 4 en 2009 à 20,1% 5 en 2014. Ces grandes réalisations sont principalement attribué aux caractéristiques particulières des matériaux pérovskites, comme le faible coût, haute photo à électrique rendement de conversion, propriétés d'absorption de lumière élevés, bandgap directe, haute charge- la mobilité des porteurs et électron-trou à long transport exciton la distance (plus de 1 um). 6-8 matériau perovskite est soluble, ce qui le rend très facile et pas cher pour préparer solaire perovskite cellules.

Published
2018

7. Design of oxide contacts and mixed cation hybrid perovskites for highly efficient solar cells

Author

Wang, Pengjiu, STAR, ABES, Institut de Recherche de Chimie Paris (IRCP), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Ministère de la Culture (MC), Université Paris sciences et lettres, and Thierry Pauporté

Subjects
Solar cells, Cellules solaires, [CHIM.OTHE] Chemical Sciences/Other, Photovoltaïque, Titanium dioxide, Photovlatic, Dioxyde de titane, [CHIM.OTHE]Chemical Sciences/Other, Perovskite
Abstract

Perovskite-based solar cells (PSCs) have emerged as the most promising new generation of photovoltaic technology.Organometal trihalide perovskite solar cells (PSC) have aroused widespread academic and commercial interests due to rapid increase in efficiency, which has boosted from 3.8%4 in 2009 to 20.1%5 in 2014. These great achievements are mainly attributed to the unique characteristics of perovskite materials, such as low cost, high photo-to-electric conversion efficiency, high light absorption properties, direct bandgap, high charge- carrier mobility and long electron-hole exciton transport distance (more than 1 µm). 6-8 Perovskite material is soluble, which makes it quite easy and cheap to prepare perovskite solar cells., Base perovskite-cellules solaires (CSP) ont émergé comme la nouvelle génération la plus prometteuse du photovoltaïque technology.Organometal trihalogénure perovskite cellules solaires (PSC) ont suscité intérêts académiques et commerciaux répandus en raison de rapide accroître l'efficacité, qui a stimulé de 3,8% 4 en 2009 à 20,1% 5 en 2014. Ces grandes réalisations sont principalement attribué aux caractéristiques particulières des matériaux pérovskites, comme le faible coût, haute photo à électrique rendement de conversion, propriétés d'absorption de lumière élevés, bandgap directe, haute charge- la mobilité des porteurs et électron-trou à long transport exciton la distance (plus de 1 um). 6-8 matériau perovskite est soluble, ce qui le rend très facile et pas cher pour préparer solaire perovskite cellules.

Published
2018

11. The Experimental Study on Depletion Development Factors of Condensate Gas Reservoirs

Author

Zhiqiang He, Guolong Zhang, Jianjun Zhu, Wang Pengjiu, and Qingheng Zeng

Subjects
Petroleum engineering, Chemistry, High pressure, Water saturation
Abstract

There will be a variety of factors restricting the development of the condensate gas reservoirs in the process of mining depletion. There are many important implications for the actual production to study the results of these factors of recovery ratio. Taking advantage of the high temperature high pressure full diameter core flooding system, this paper conducts a lab experiment of the victory, the irreducible water saturation, the reservoir and the fluid properties to obtain the results of its impact on recovery ratio. The experiment results show that under the influence of these four factors, condensate ratio has varying degrees of change, and the gas ratio will not be much fluctuation.

Published
2015

16. Charge Injection and Electrical Response in Low-Temperature SnO 2 -Based Efficient Perovskite Solar Cells.

Author

Ulfa M, Wang P, Zhang J, Liu J, de Marcillac WD, Coolen L, Peralta S, and Pauporté T

Abstract

Defining low-temperature engineering protocols for efficient planar perovskite solar cell (PSC) preparation is important for fabrication simplification and low-cost production. In the present work, we have defined a low-temperature (123 °C) protocol for the preparation from a solution of SnO 2 layers which are efficient for an application as an electron transporting layer (ETL) in PSCs. Thin, conformal, and transparent layers have been obtained. The related PSCs have shown best devices with a power conversion efficiency of 18.22% and low-hysteresis J- V curves (a hysteresis index of 6.7%). Charge injection has been thoroughly studied by photoluminescence decay measurements. The decay curves followed a biexponential function. The injection of holes into the spiro-OMeTAD layer was found very fast and is a no-limiting step. On the other side, the charge injection into the oxide ETLs depends on its structure and on the oxide. The time constant for the low-temperature SnO 2 layers is close to that of the mesoporous benchmark layers with a fast (surface) and a slow (bulk) component at 11 and 129 ns with relative contributions calculated at 13% and 87%, respectively. The phenomena occurring at a longer time scale have been investigated by impedance spectroscopy. The SnO 2 cell spectra showed no intermediate-frequency inductive loop. The very low frequency part of the spectra was characterized by the beginning of an arc of a circle at the origin of a very large resistance over a large applied potential range. This resistance, along with an intermediate-frequency resistance, has been assigned to a recombination resistance and explains the very large  V oc achievable with SnO 2 PSCs. The existence of a capacitance at the intermediate frequency with a noticeable low value at about 0.2 mF·cm -2 is linked with the low hysteresis of the devices.

Published
2018
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