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Your search keyword '"Zhang, Xiaoliang"' showing total 91 results
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91 results on '"Zhang, Xiaoliang"'

17. Methylammonium Bromide Assisted Crystallization for Enhanced Lead-Free Double Perovskite Photovoltaic Performance

Author

Wu, Hua, Wang, Yunfei, Liu, Aijie, Wang, Junxin, Kim, Byeong Jo, Liu, Yawen, Fang, Yuan, Zhang, Xiaoliang, Boschloo, Gerrit, Johansson, Erik, Wu, Hua, Wang, Yunfei, Liu, Aijie, Wang, Junxin, Kim, Byeong Jo, Liu, Yawen, Fang, Yuan, Zhang, Xiaoliang, Boschloo, Gerrit, and Johansson, Erik

Abstract

Cs2AgBiBr6, has recently gained wide attention as a possible alternative to lead-halide perovskites, considering the nontoxicity and improved stability. However, this double perovskite suffers from defects, especially deep electron traps, severely hampering the photovoltaic performance. This work reports a simple method to control the double perovskite crystallization by adding volatile salts into the precursor solution. X-ray diffraction patterns reveal that the organic cation with suitable radius (such as methylammonium, MA(+)) is introduced into the perovskite lattice, forming an organic/inorganic mixed double perovskite intermediate phase. The organic salt is thereafter fully evaporated during high temperature annealing, and the all-inorganic double perovskite is obtained with dense surface and less pin-holes. From optical and electrical characterization, it is concluded that the Cs2AgBiBr6 film exhibits high quality, with higher light absorptance and emission. Reduced trap density and longer carrier lifetime are also observed. The improved Cs2AgBiBr6 film is beneficial for efficient carrier collection with suppressed defect-assisted recombination. With this strategy, a power conversion efficiency (PCE) of 2.53% is achieved for the champion Cs2AgBiBr6-based solar cell device, which is significantly higher compared to the control device with 1.43% PCE. This work is therefore helpful for further improvement of inorganic lead-free perovskite materials for optoelectronic applications.

Published
2022
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23. SuperDTI: Ultrafast DTI and fiber tractography with deep learning

Author

Li, Hongyu, primary, Liang, Zifei, additional, Zhang, Chaoyi, additional, Liu, Ruiying, additional, Li, Jing, additional, Zhang, Weihong, additional, Liang, Dong, additional, Shen, Bowen, additional, Zhang, Xiaoliang, additional, Ge, Yulin, additional, Zhang, Jiangyang, additional, and Ying, Leslie, additional

Published
2021
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24. Strong Coupling of Colloidal Quantum Dots via Self-Assemble Passivation for Efficient Infrared Solar Cells

Author

Zheng, Siyu, Wang, Yunfei, Jia, Donglin, Tian, Lei, Chen, Jingxuan, Shan, Lianwei, Dong, Limin, Zhang, Xiaoliang, Zheng, Siyu, Wang, Yunfei, Jia, Donglin, Tian, Lei, Chen, Jingxuan, Shan, Lianwei, Dong, Limin, and Zhang, Xiaoliang

Abstract

The surface passivation of colloidal quantum dots (CQD) is critical for the electronic coupling of CQDs, which significantly affects the photovoltaic performance of CQD solar cells (CQDSCs). Herein, a self-assemble passivation (SAP) strategy of CQDs is introduced to improve CQD coupling. The PbI2 passivation layer prepared using the SAP method can largely improve surface defect passivation of CQDs, diminishing charge recombination induced by the sub-bandgap traps. Meanwhile, extensive theoretical simulations reveal that the self-assembled PbI2 passivation layer works as a "charger bridge" for charge transport between the adjacent CQDs, avoiding CQD fusion. The infrared CQDSCs are fabricated and the SAP-based CQDSC yields an efficiency of up to 12.3%, which is significantly improved compared with that of the conventional CQDSCs with iodide passivating CQD surface. The improved photovoltaic performance in the SAP-based CQDSCs is attributed to increased charge extraction, resulting from strong CQD coupling within the CQD solid films. This work provides a simple and facile way to improve the electronic coupling of CQDs for high-performance infrared CQDSCs.

Published
2021
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29. Risk assessment on chemical plants by the method of safety checklist analysis

Author

Zhang Zhikai, He Rui, Zhao Daoliang, Zhang Xiaoliang, Shen Qian, and Song Huijuan

Subjects
021110 strategic, defence & security studies, Engineering, Process (engineering), business.industry, General Chemical Engineering, 0211 other engineering and technologies, Specialty, 02 engineering and technology, Checklist, 021105 building & construction, Operations management, Safety, Risk, Reliability and Quality, Risk assessment, business
Abstract

In this article, 46 chemical plants were investigated and assessed by Safety Department of Shanghai Institute of Technology in China. The safety management and technology ability and level were evaluated by the method of Safety Checklist Analysis (SCA) under the perspective of Safety Specialty Engineer. The risk levels of the overall of 46 plants were got. The SCA assessment presents the visible and invisible risks of the plants quantitatively and plainly. The results show that a majority of the plants have not fully implemented either on the good safety management or the reliable safety practice technology. The level of the overall risk indicate that about 35% of the plants reach the level of A (Scores ≥90), and others both lower than A, even 2 plants in the level of E, with total disregard for their health, safety, and well-being. Otherwise, 23 items were surveyed and judged one by one in safety assessment by SCA, and put forward suggestions for rectify and reform, which helps the plants recognize the reality of the situation and make better in the future. © 2016 American Institute of Chemical Engineers Process Saf Prog 36: 95–101, 2017

Published
2016
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37. Fault-Growth Pattern of the South Margin Normal Fault of the Yuguang Basin in Northwest Beijing and its Influencing Factors

Author

Wang Lin, LI Dewen, Tian Qinjian, and Zhang Xiaoliang

Subjects
law, Transform fault, Geology, Slip (materials science), Slippage, Radar, Structural basin, Fault scarp, Digital elevation model, Slipping, Seismology, law.invention
Abstract

Based on high-resolution remote sensing image interpretation, digital elevation model 3-D analysis, field geologic field investigation, trenching engineering, and ground-penetrating radar, synthetic research on the evolution of the Yuguang Basin South Margin Fault (YBSMF) in northwest Beijing was carried out. We found that the propagation and growth of faults most often occurred often at two locations: the fault overlapping zone and the uneven or rough fault segment. Through detailed observation and analysis of all cropouts of faults along the YBSMF from zone a to zone i, we identified three major factors that dominate or affect fault propagation and growth. First, the irregularity of fault geometry determine the propagation and growth of the fault, and therefore, the faults always propagate and grow at such irregular fault segments. The fault finally cuts off and eliminates its irregularity, making the fault geometry and fault plane smoother than before, which contributes to the slipping movement of the half-graben block in the basin. Second, the scale of the irregularity of the fault geometry affects the result of fault propagation and growth, that is, the degree of the cutting off of fault irregularity. The degree of cutting off decreases as irregularity scale increases. Third, the maximum possible slip displacement of the fault segment influences the duration of fault propagation and growth. The duration at the central segments with a large slip displacement is longer than that at the end segments with a smaller slippage value.

Published
2013
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38. Inorganic CsPbI3 Perovskite Coating on PbS Quantum Dot for Highly Efficient and Stable Infrared Light Converting Solar Cells

Author

Zhang, Xiaoliang, primary, Zhang, Jindan, additional, Phuyal, Dibya, additional, Du, Juan, additional, Tian, Lei, additional, Öberg, Viktor A., additional, Johansson, Malin B., additional, Cappel, Ute B., additional, Karis, Olof, additional, Liu, Jianhua, additional, Rensmo, Håkan, additional, Boschloo, Gerrit, additional, and Johansson, Erik M. J., additional

Published
2017
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