Article
Engineering, Environmental
Yansen Sun, Shuo Yang, Zhenyu Pang, Haipeng Jiang, Shaohua Chi, Xiaoxu Sun, Lin Fan, Fengyou Wang, Xiaoyan Liu, Maobin Wei, Lili Yang, Jinghai Yang
Summary: In this study, a synergistic passivation strategy was developed to improve perovskite device performance by repairing the perovskite films and bilateral interfaces. Firstly, SnO2 electron transport layer (ETL) was modified using an appropriate amount of phenylethylammonium chloride. Then, N,N'-Bis-(1-naphthalenyl)-N,N'-bis-phenyl(1,1'-biphenyl)-4,4'-diamine (NPB) was introduced during the preparation of perovskite films to further regulate crystal quality. The obtained devices showed reduced hysteresis and enhanced long-term stability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Yudai Yamashita, Kaori Takayanagi, Kazuhiro Gotoh, Kaoru Toko, Noritaka Usami, Takashi Suemasu
Summary: The study found that Zn1-xGexOy films can serve as excellent interlayers for BaSi2, providing high photoresponsivity and effective surface passivation, thereby reducing carrier recombination rate.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
M. Thambidurai, Mohamed Omer, Foo Shini, Herlina Arianita Dewi, Nur Fadilah Jamaludin, Teck Ming Koh, Xiaohong Tang, Nripan Mathews, Cuong Dang
Summary: This study presents a facile yet excellent approach to enhance the thermal stability and power conversion efficiency (PCE) of perovskite solar cells (PSCs) by introducing triphenylphosphine (TPP) as a passivator. The TPP-passivated devices exhibited superior ambient and thermal stability, with a retention of 71% of its initial PCE after long-term storage at high temperature and humidity.
Article
Chemistry, Multidisciplinary
Dengxue Li, Zhi Xing, Xiangchuan Meng, Xiaotian Hu, Ting Hu, Yiwang Chen
Summary: In this study, a spontaneous internal encapsulation strategy was developed by constructing a dual interfacial perovskite heterojunction at the top and buried interface of the three-dimensional perovskite film. The spacer cations of the two-dimensional perovskite structure interacted strongly with the 3D perovskite to passivate the defects and optimize the energy level alignment. The interfacial perovskite heterojunction underearth delayed the crystallization speed and improved the crystallization quality of the upper 3D perovskite. As a result, the perovskite solar cell exhibited a high power conversion efficiency of 22.92% and maintained 88% of its initial efficiency after 2900 hours under air.
Article
Chemistry, Physical
Yaxiong Guo, Junjie Ma, Feihong Ye, Haibing Wang, Zongwei Pan, Liangbin Xiong, Zuojun Tan
Summary: The introduction of the nonfullerene Y6 additive effectively suppressed nonradiative recombination by passivating electronic defects, leading to high quality perovskite films with improved stability. Simultaneously, it enabled a well-matched energy alignment at the perovskite/electronic transport material interface, facilitating charge extraction through graded heterojunction structure and achieving a power conversion efficiency of up to 20.6% in planar inverted perovskite solar cells.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Multidisciplinary
Lingbo Jia, Fanyang Huang, Honghe Ding, Chuang Niu, Yanbo Shang, Wanpei Hu, Xingcheng Li, Xin Yu, Xiaofen Jiang, Ruiguo Cao, Junfa Zhu, Guan-Wu Wang, Muqing Chen, Shangfeng Yang
Summary: The study developed a novel perfluoroalkyl and pyridine-cofunctionalized fullerene derivative, which achieved double-site defect passivation of perovskite film and a champion power conversion efficiency of 20.10% for inverted BHJ-PVKSCs. Additional experiments with a non-fluoro-substituted pyridine-functionalized fullerene derivative demonstrated the crucial role of the perfluoroalkyl group in efficiency enhancement.
Article
Biochemistry & Molecular Biology
Yaodong Xiao, Xiangqian Cui, Boyuan Xiang, Yanping Chen, Chaoyue Zhao, Lihong Wang, Chuqun Yang, Guangye Zhang, Chen Xie, Yulai Han, Mingxia Qiu, Shunpu Li, Peng You
Summary: Researchers propose a facile and effective modification strategy for the electron transport layer (ETL) of perovskite solar cells (PSCs) by incorporating MDACl(2) into the SnO2 precursor colloidal solution. The addition of MDACl(2) effectively passivates the surface defects of the SnO2 film, resulting in increased conductivity and improved electron extraction and transport. The MDACl(2) modification also contributes to the formation of high-quality perovskite films with improved crystallinity and reduced defect density, and achieves a more suitable energy level alignment at the ETL/perovskite interface, leading to enhanced charge transport and improved PSC efficiency and stability.
Article
Nanoscience & Nanotechnology
Yan Li, Siqi Li, Yujie Shen, Xue Han, Yao Li, Yingchun Yu, Meilan Huang, Xia Tao
Summary: The study utilized a multifunctional agent histidine (His) to modify the SnO2/perovskite interface, reducing interfacial trap state density and nonradiative recombination loss, improving electron extraction/transfer efficiency, and enhancing device performance, leading to superior power conversion efficiency and open-circuit voltage.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Energy & Fuels
Junjie Ma, Yanping Song, Huanhuan Sun, Boyang Han, Dan Chi, Yuan Wang, Ting Wang, Xiuqing Meng, Shihua Huang, Bin Yao
Summary: Researchers propose a novel heterojunction interface (HEI) doping strategy to address HEI recombination issue in Cu2ZnSn(S,Se)4 (CZTSSe) solar cells by introducing Cu-poor (& Al-rich) CuAlO2 (CAO). The interdiffusion of interfacial elements between Cu from absorber and Al from CAO during selenization results in absorber shallow bulk inversion and the formation of a desirable homogeneous field passivation (HFP) for HEI. Furthermore, CAO itself contributes to a chemical passivation effect due to its high resistivity. The synergistic passivation effect combining common chemical passivation with novel HFP leads to the achievement of 9.34% efficiency kesterite device with simultaneous chemical and field passivation effects.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Applied
Yitian Du, Jihuai Wu, Xinpeng Zhang, Qianjin Zhu, Mingjing Zhang, Xuping Liu, Yu Zou, Shibo Wang, Weihai Sun
Summary: The use of an organic halide salt to passivate surface defects in perovskite solar cells resulted in improved efficiency and stability, with the treated device achieving higher performance compared to untreated and differently treated devices in the same experimental conditions.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Jianjun Zhang, Linxi Wang, Chenhui Jiang, Bei Cheng, Tao Chen, Jiaguo Yu
Summary: By doping CsPbBr3 nanocrystals into perovskites, a bilateral interface modification was achieved which effectively suppressed defects and enhanced electron transport. The enhanced built-in electric field facilitated oriented migration of carriers within the perovskite, resulting in a power conversion efficiency exceeding 20% in the solar cells.
Article
Chemistry, Applied
Shasha Zhang, Xiaobo Yan, Zonghao Liu, Hongmei Zhu, Zhichun Yang, Yuqian Huang, Sanwan Liu, Di Wu, Ming Pan, Wei Chen
Summary: A simple and efficient double-sided interfacial passivation method DIP-KCl is reported, which can effectively reduce defects in perovskite solar cells and improve performance, leading to increased efficiency and stability.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Physical
Jiadong Zang, Caiyun Zhang, Yue Qiang, Qi Liu, Yuemeng Fei, Ze Yu
Summary: In this study, the use of 2-mercaptopyrimidine (MPM) successfully improved the efficiency of metal halide perovskite solar cells (PSCs) and enhanced their stability in high humidity environments.
SURFACES AND INTERFACES
(2021)
Article
Chemistry, Physical
Fangfang Cai, Jianming Lin, Weichun Pan, Sijia Zhu, Wenjing Li, Yitian Du, Juanmei Liu, Minmin Yang, Jihuai Wu
Summary: Introducing lauric acid as a surface passivation agent in perovskite solar cells improves the stability and performance of the device by reducing carrier nonradiative combinations and enhancing the photovoltaic performance. The saturated alkyl chain of lauric acid forms a protective layer on the perovskite films, increasing their moisture resistance and environmental stability.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Multidisciplinary Sciences
Cheng Liu, Yi Yang, Kasparas Rakstys, Arup Mahata, Marius Franckevicius, Edoardo Mosconi, Raminta Skackauskaite, Bin Ding, Keith G. Brooks, Onovbaramwen Jennifer Usiobo, Jean-Nicolas Audinot, Hiroyuki Kanda, Simonas Driukas, Gabriele Kavaliauskaite, Vidmantas Gulbinas, Marc Dessimoz, Vytautas Getautis, Filippo De Angelis, Yong Ding, Songyuan Dai, Paul J. Dyson, Mohammad Khaja Nazeeruddin
Summary: The study focuses on understanding the energy barrier of 2D perovskite formation and proposes a method to prevent the formation of in-plane favored 2D perovskite layers, leading to improved device performance.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Hao Pan, Dashi Lu, Lihua Zhu, Mingyu Li, Hongjun Ji
Summary: Thermal behavior and phase ratios optimization of Sn/Cu composite solders were studied. The results showed that increased solid-liquid contact area promoted the formation of IMC, resulting in decreased melting endothermic peak temperature of Sn and its enthalpy change. The in situ temperature rose with higher solid-liquid contact area during ultrasonic-assisted transient liquid phase. The phase ratio of residual Cu and Cu3Sn increased with decreasing solid-liquid contact area after U-TLP, while it increased with more initial Cu content.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Bo Wang, Mingyu Li, Yuxuan Liu, Xinyi Liang, Yang Yang, Xinzheng Lan, Liang Gao, Jianbing Zhang, Jiang Tang
Summary: Researchers have developed a new and simple synthesis method for highly monodisperse and halide passivated PbS quantum dots. This method improves the quality of quantum dots and enhances their optoelectronic properties.
Article
Engineering, Electrical & Electronic
Chunyu Hu, Rongxing Yang, Weimin Shi, Li Li, Ruibin Gao, Zhijiang Dai, Jingzhou Pang, Mingyu Li
Summary: This paper presents a complex combining method for designing wideband Outphasing power amplifiers (OPAs). The method uses complex combining impedance to compensate for the frequency dispersion of the active load modulation in the OPA, extending its bandwidth. It is illustrated for the first time that the load modulation trajectories of the OPA can be corrected over a wide bandwidth by designing the complex combining impedance.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Yao Yao, Weimin Shi, Jingzhou Pang, Zhijiang Dai, Mingyu Li
Summary: This paper develops a simple dual-input dual-output (DIDO) Doherty power amplifier (DPA) that achieves flexible power transferring and enhanced efficiency by dynamically controlling the input amplitudes and phase difference of two sub-amplifiers. The fabricated DIDO-DPA operates at 2.4 GHz and delivers an output power of over 43.3 dBm, with a maximum drain efficiency (DE) of over 69.5% and a 6-dB back-off DE of over 58% at each output port.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Wenyi Jia, Zefan Feng, Tianfu Cai, Mingyu Li, Weimin Shi, Zhijiang Dai
Summary: In this paper, a robust constrained filtering algorithm called recursive constrained least arctangent (RCLA) adaptive algorithm is proposed. By introducing a novel cost function framework, the proposed RCLA algorithm shows superior convergence performance and better steady-state behavior against impulsive noises compared to other existing recursive methods. The mean square convergence analysis and theoretical transient mean square deviation (MSD) are derived in detail. Computer simulations are conducted to validate the theoretical analysis and verify the superior behavior of the proposed RCLA algorithm compared to known algorithms under non-Gaussian environments.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Jinting Liu, Weimin Shi, Linping Feng, Mingyu Li
Summary: This paper introduces the use of a dual-input technique to improve the conversion efficiency of a broadband Doherty power amplifier (DPA). By dynamically controlling the input power levels and phase difference between the carrier and peaking power amplifiers (PAs), the efficiency between the two peaks in the DPA is enhanced. Experimental results demonstrate the effectiveness of the fabricated dual-input DPA (DI-DPA) operating over the 1.1-2.2 GHz frequency range.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yixuan Lin, Xiaoquan Qi, Guoqiang Niu, Qin Sun, Hongjun Ji, Mingyu Li, Yufeng Li
Summary: This study demonstrates the successful surface metallization of Si3N4 ceramic substrate using the thick film method. High-performance silver thick films were formed on the Si3N4 surface, with significantly improved mechanical and electrical properties at higher sintering temperatures. The bonding between the thick film and the substrate was enhanced through interfacial reaction, resulting in the formation of the Bi2Si2O5 phase. This study has great significance for future research on interfacial design.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Computer Science, Information Systems
Mingyu Li, Xiaobing Cheng, Zhijiang Dai, Kang Zhong, Tianfu Cai, Chaoyi Huang
Summary: A novel method to extend the output power back-off (OPBO) range of the Doherty power amplifier (DPA) is proposed. The OPBO range of the DPA can be extended by tuning the output impedance of the peaking stage and changing the phase delay of the output matching network. A large OPBO range high-efficiency asymmetrical DPA is designed and tested within a working band of 1.55 to 2.2 GHz (35% relative bandwidth) to validate the proposed method. The experimental results show that the DPA operates from 1.6 to 2.1 GHz with an OPBO range of 11.1-13.2 dB and efficiency range of 42.2%-52.1% in the OPBO state and 47%-62.7% in the saturation state.
FRONTIERS OF INFORMATION TECHNOLOGY & ELECTRONIC ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Sisi Liu, Meng Wang, Xiong Yu, Hao Li, Haifei Lu, Xiaoyan Wen, Ming-Yu Li, Jianbing Zhang
Summary: A hybrid electron transport layer (ETL) consisting of titanium-based nanomaterials and sol-gel zinc oxide (ZnO) is developed to enhance the infrared power conversion efficiency (PCE) of lead selenide (PbSe) quantum dot solar cells.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yanran Wang, Ming-yu Li, Shijie Liu, Yuan Ma, Bo Sun, Liangyu Wang, Haifei Lu, Xiaoyan Wen, Sisi Liu, Xumin Ding
Summary: Perovskite quantum dot/nanoplate heterostructures show great potential in underwater optical wireless communication systems, with improved photoluminescent efficiency and stability.
Article
Engineering, Electrical & Electronic
Zhijiang Dai, Shuman Kong, Mingyu Li, Tianfu Cai, Yi Jin, Changzhi Xu
Summary: A low-complexity Digital PreDistortion (DPD) method based on Improved Sparse Least Squares Twin Support Vector Regression (ISLSTSVR) modeling theory is proposed in this paper to tackle the resource consumption issue caused by the nonlinearity of the power amplifier in the RF front-end of high-capacity satellite communication. Experimental results show that this method can significantly reduce the coefficients and computational complexity of the DPD model while maintaining its accuracy, providing an effective idea and method for coefficient dimension reduction in the predistortion technology of spaceborne RF front-ends.
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Weiheng Jiang, Yaoxing Duan, Mingyu Li, Yi Jin, Changzhi Xu, Li Li
Summary: In traditional Digital PreDistortion (DPD) models, the same set of polynomial models and memory model are used to linearize the Power Amplifier (PA) at all input signal powers. However, different power levels exhibit different nonlinear characteristics and memory effects in PAs. To solve this problem, a DPD model based on the blind K-Nearest Neighbor (KNN) algorithm with dimension weighting is proposed. The proposed method is experimentally verified using a Doherty PA and a three carrier Long Term Evolution (LTE) signal.
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Guangwen Yang, Xinpeng Li, Jinting Liu, Xiaojuan Han, Hong Chang, Wei Zhang, Xinquan Yang, Mingyu Li
Summary: In this paper, the analysis and design method for the suboptimum Class-EM/F3 inverter with a duty ratio D =0.5 are presented. By introducing the new design parameter K, the suboptimum degree and the distance from the optimum condition can be defined. The proposed inverter offers lower peak switching voltage and higher efficiency compared to the conventional Class-E-M inverter.
Article
Engineering, Electrical & Electronic
Zixiong Li, Mingyu Li, Xinyi Hou, Lei Du, Lin Xiao, Tianshu Wang, Wanzhuo Ma
Summary: This paper proposes a mode-locked fiber laser based on graphene-coated microfiber. The total length of the fiber laser resonant cavity is 31.34 m. Dual-wavelength tuning is realized by adjusting the polarization controller (PC), and the wavelength tuning range is 11 nm. The effects of polarization states on bright-dark solitons are studied, and it is demonstrated that the mode-locking state can be switched between conventional solitons and bright-dark solitons in the graphene mode-locked fiber laser. Bright-dark soliton pairs with different shapes and nanosecond pulse width can be obtained by adjusting the PC and pump power.
FRONTIERS OF OPTOELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Chunyu Hu, Weimin Shi, Rongxing Yang, Shuaijiang Lin, Zhijiang Dai, Ruibin Gao, Chaoyi Huang, Jingzhou Pang, Mingyu Li
Summary: This letter presents the design and implementation of a broadband outphasing power amplifier (OPA) with complex combining impedance. The complex combining impedance, achieved through a post-matching network (PMN), is used to compensate for the frequency dispersion in the OPA. The results show that the designed OPA achieves high performance in terms of saturation power, saturation drain efficiency, and back-off efficiency over a wide frequency range.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)