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4 results on '"Zhenchao Li"'

1. Quantitative effects of air pollution on regional daily global and diffuse solar radiation under clear sky conditions

Author

Liwei Yang, Xiaoqing Gao, Zhenchao Li, and Dongyu Jia

Subjects
Global solar radiation, Diffuse solar radiation, Air quality index, Air pollution, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

Air pollution is one of the most important factors affecting the solar radiation reaching the earth’s surface under the clear (cloudless) sky conditions. In this work, six typical cities with serious pollution located in the north, northeast, eastern, central, southwest, and southern regions of China: Beijing, Shenyang, Shanghai, Wuhan, Wenjiang and Guangzhou were selected. The influence of air pollution on global and diffuse solar radiation (Rsand Rd) under clear sky condition was quantitatively analyzed, based on the historical daily meteorological data from January 2014 to December 2020. The results showed that the highest Rsattenuation ratio of the above six cities appeared in spring, autumn, winter, summer, autumn and winter, respectively. The largest Rdincrement ratio of the six cities appeared in summer, spring, autumn, summer, autumn and spring, respectively. From 2014 to 2020, the relative attenuation of Rscaused by air pollution (AQI > 100) was largest in Beijing (6.03%), followed by Shanghai (4.21%), Wenjiang (4.15%), Shenyang (3.28%) and Wuhan (3.14%), while Guangzhou (1.32%) had the smallest relative attenuation. Additionally, the Rdrelative increment was largest in Beijing (16.21%), followed by Shanghai (8.78%), Wenjiang (8.13%), Shenyang (7.76%) and Guangzhou (5.96%), while Wuhan (2.57%) had the smallest relative increment.

Published
2022
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2. Stable Sn/Pb-Based Perovskite Solar Cells with a Coherent 2D/3D Interface

Author

Ziming Chen, Meiyue Liu, Zhenchao Li, Tingting Shi, Yongchao Yang, Hin-Lap Yip, and Yong Cao

Subjects
Science
Abstract

Summary: Low-band-gap metal halide perovskite semiconductor based on mixed Sn/Pb is a key component to realize high-efficiency tandem perovskite solar cells. However, the mixed perovskites are unstable in air due to the oxidation of Sn2+. To overcome the stability problem, we introduced N-(3-aminopropyl)-2-pyrrolidinone into the CH3NH3Sn0.5Pb0.5IxCl3-x thin film. The carbonyl group on the molecule interacts with Sn2+/Pb2+ by Lewis acid coordination, forming vertically oriented 2D layered perovskite. The 2D phase is seamlessly connected to the bulk perovskite crystal, with a lattice coherently extending across the two phases. Based on this 2D/3D hybrid structure, we assembled low-band-gap Sn-based perovskite solar cells with power conversion efficiency greater than 12%. The best device was among the most stable Sn-based organic-inorganic hybrid perovskite solar cells to date, keeping 90% of its initial performance at ambient condition without encapsulation, and more than 70% under continuous illumination in an N2-filled glovebox for over 1 month. : Materials Science; Optical Materials; Energy Materials Subject Areas: Materials Science, Optical Materials, Energy Materials

Published
2018
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3. Efficient monolithic perovskite/organic tandem solar cells and their efficiency potential

Author

Jingjing Tian, Zhen Chen, Hin-Lap Yip, Yong Cao, Shenkun Xie, Lei Yan, Minrun Ren, Ruoxi Xia, Guichuan Zhang, Zhenchao Li, and Qifan Xue

Subjects
Materials science, Tandem, Organic solar cell, Renewable Energy, Sustainability and the Environment, Band gap, business.industry, Photovoltaic system, Energy conversion efficiency, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Optoelectronics, 0303 Macromolecular and Materials Chemistry, 0912 Materials Engineering, 1007 Nanotechnology, General Materials Science, Quantum efficiency, Electrical and Electronic Engineering, 0210 nano-technology, business, Absorption (electromagnetic radiation), Perovskite (structure)
Abstract

A high-performance monolithic perovskite/organic tandem solar cell based on the integration of a large bandgap CsPbI2Br inorganic perovskite front cell with a narrow bandgap PM6:Y6-based or PTB7-Th:O6T-4F-based bulk-heterojunction organic rear cell is demonstrated. Large bandgap inorganic perovskites are well suited candidates for the front cell due to their excellent optoelectronic properties and broad absorption for visible light, they also possess smaller voltage loss (Eloss) and higher external quantum efficiency (EQE) response when compare to their organic counterparts with approximate bandgap. Low bandgap organic solar cells offer potentially better stability and absorption tunability compared with the Sn-based perovskite counterparts, making them be good candidates for the rear cell of the tandem cells. As a result, the best power conversion efficiency (PCE) of the perovskite/organic tandem cell presented in this work reaches over 18%. In addition, based on the photovoltaic performance parameters (EQE, fill factor (FF), Eloss) that have already been achieved in state-of-the-art organic and perovskite solar cells, we further evaluate the potential PCE of the perovskite/organic tandem cells, showing a maximum calculated PCE of over 31% when the bandgaps of the subcells are optimized. This work paves the way for the development of hybrid tandem solar cells with promising performance.

Published
2020

4. Stable Sn/Pb-Based Perovskite Solar Cells with a Coherent 2D/3D Interface

Author

Tingting Shi, Yongchao Yang, Zhenchao Li, Hin-Lap Yip, Meiyue Liu, Ziming Chen, and Yong Cao

Subjects
Materials science, Materials Science, Halide, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Article, Energy Materials, Metal, Molecule, Thin film, lcsh:Science, Perovskite (structure), Multidisciplinary, Tandem, Optical Materials, business.industry, Energy conversion efficiency, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Semiconductor, Chemical engineering, visual_art, visual_art.visual_art_medium, lcsh:Q, 0210 nano-technology, business
Abstract

Summary Low-band-gap metal halide perovskite semiconductor based on mixed Sn/Pb is a key component to realize high-efficiency tandem perovskite solar cells. However, the mixed perovskites are unstable in air due to the oxidation of Sn2+. To overcome the stability problem, we introduced N-(3-aminopropyl)-2-pyrrolidinone into the CH3NH3Sn0.5Pb0.5IxCl3-x thin film. The carbonyl group on the molecule interacts with Sn2+/Pb2+ by Lewis acid coordination, forming vertically oriented 2D layered perovskite. The 2D phase is seamlessly connected to the bulk perovskite crystal, with a lattice coherently extending across the two phases. Based on this 2D/3D hybrid structure, we assembled low-band-gap Sn-based perovskite solar cells with power conversion efficiency greater than 12%. The best device was among the most stable Sn-based organic-inorganic hybrid perovskite solar cells to date, keeping 90% of its initial performance at ambient condition without encapsulation, and more than 70% under continuous illumination in an N2-filled glovebox for over 1 month., Graphical Abstract, Highlights • The 2D perovskite lattice is seamlessly connected to the 3D perovskite lattice • Polymorphs of 2D perovskite were directly observed in a single perovskite film • The best device is among the most stable Sn-based perovskite solar cells to date, Materials Science; Optical Materials; Energy Materials

Published
2018

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