Meifang Yang

Baotou Teachers College

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Co-Authors

Wu‐Qiang Wu

Nankai University

Jinghai Yang

Jilin Normal University

Tian Tian

Nanjing University

Fengyou Wang

Jilin Normal University

Lili Yang

Jilin Normal University

Wenhuai Feng

Sun Yat-sen University

Lin Fan

Fujian Provincial Hospital

Yingrui Sui

Jilin Normal University

Yuhong Zhang

Hubei University

Jun‐Xing Zhong

Guangdong University Of Finances and Economics

Cooperative Institutions

Sun Yat-sen University

Yangzhou University

Jilin Normal University

Chinese Academy of Sciences

Jilin University

University of Chinese Academy of Sciences

Chongqing University of Posts and Telecommunications

Wuhan University of Technology

Shandong University

Northwestern Polytechnical University

Author Statistics

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Citation

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Steady-State Analysis of the Constant Power Region in Distributed Maximum Power Point Tracking Architecture with Photovoltaic Applications

2022 IEEE Energy Conversion Congress and Exposition (ECCE) (2024)

Guanying Chu Qinglei Bu Meifang Yang

Constant (computer programming)

Tracking (education)

Distributed power

Maximum power principle

10.1109/ecce55643.2024.10861337

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Citations (0)

Modulation of Ni3+ and crystallization of dopant-free NiOx hole transporting layer for efficient p-i-n perovskite solar cells

Electrochimica Acta (2019)

Yuhong Zhang Meifang Yang Jinyue Du Lili Yang Lin Fan

Nickel oxide

10.1016/j.electacta.2019.06.168

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Citations (24)

Interface Dipole Induced Field‐Effect Passivation for Achieving 21.7% Efficiency and Stable Perovskite Solar Cells

Advanced Functional Materials (2020)

Fengyou Wang Yuhong Zhang Meifang Yang Donglai Han Lili Yang

Abstract Organolead halide hybrid perovskite solar cells (PSCs) have become a shining star in the renewable devices field due to the sharp growth of power conversion efficiency; however, interfacial recombination and carrier‐extraction losses at heterointerfaces between the perovskite active layer and the carrier transport layers remain the two main obstacles to further improve the power conversion efficiency. Here, novel field‐effect passivation has been successfully induced to effectively suppress the interfacial recombination and improve interfacial charge transfer by incorporating interfacial polarization via inserting a high work function interlayer between perovskite and holes transport layer. The charge dynamics within the device and the mechanism of the field‐effect passivation are elucidated in detail. The unique interfacial dipoles reinforce the built‐in field and prevent the photogenerated charges from recombining, resulting in power conversion efficiency up to 21.7% with negligible hysteresis. Furthermore, the hydrophobic interlayer also suppresses the perovskite decomposition by preventing the moisture penetration, thereby improving the humidity stability of the PSCs (>91% of the initial power conversion efficiency (PCE) after 30 d in 65 ± 5% humidity). Finally, several promising research perspectives based on field‐effect passivation are also suggested for further conversion efficiency improvements and photovoltaic applications.

Passivation

Perovskite solar cell

Field effect

Charge carrier

10.1002/adfm.202008052

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Citations (60)

Interfacial Linkage and Carbon Encapsulation Enable Full Solution‐Printed Perovskite Photovoltaics with Prolonged Lifespan

Angewandte Chemie (2021)

Tian Tian Jun‐Xing Zhong Meifang Yang Wenhuai Feng Chengxi Zhang

Abstract Simplified perovskite solar cells (PSCs) were fabricated with the perovskite layer sandwiched and encapsulated between carbon‐based electron transport layer (ETL) and counter electrode (CE) by a fully blade‐coated process. A self‐assembled monolayer of amphiphilic silane (AS) molecules on transparent conducting oxide (TCO) substrate appeals to the fullerene ETL deposition and preserves its integrity against the solvent damage. The AS serves as a “molecular glue” to strengthen the adhesion toughness at the TCO/ETL interface via robust chemical interaction and bonding, facilitating the interfacial charge extraction, increasing PCEs by 77 % and reducing hysteresis. A PCE of 18.64 % was achieved for the fully printed devices, one of the highest reported for carbon‐based PSCs. AS‐assisted interfacial linkage and carbon‐material‐assisted self‐encapsulation enhance the stability of the PSCs, which did not experience performance degradation when stored at ambient conditions for over 3000 h.

10.1002/ange.202108495

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Citations (7)

An Advanced Flyback Converter-Based MPPT Strategy for Optimizing PV System Performance

Meifang Yang Guanying Chu Qinglei Bu Leilei Guo Yinxiao Zhu

Buck converter

10.1109/pset62496.2024.10808628

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Activating Old Materials with New Architecture: Boosting Performance of Perovskite Solar Cells with H₂O‐Assisted Hierarchical Electron Transporting Layers

Advanced Science (2018)

Fengyou Wang Meifang Yang Yuhong Zhang Lili Yang Lin Fan

The breakthrough of organometal halide perovskite solar cells (PSCs) based on mesostructured composites is regarded as a viable member of next generation photovoltaics. In high efficiency PSCs, it is crucial to finely optimize the charge dynamics and optical properties matching between the perovskites and electron transporting materials to relax the trade-off between the optical and electrical requirements. Here, a simple antipolar route with H2O as the additive is proposed to prepare hierarchical electron transporting layers to boost the efficiency of dopant-free PSCs. The photovoltaic performance of the PSCs is enhanced owing to increased light-scattering, improved Ostwald ripening, and photo-generated electron extraction. Optimization of the H2O addition enables a valid power conversion efficiency of 19.9% (reverse scan: 20.02%) to be achieved. The device can retain more than 90% of its initial performance after storage in air more than 30 days. These results are inspiring in that they present that a mesoporous transporting layer could be easily re-constructed to hierarchical architecture by the antipolar method to further improve the performance of PSCs.

Perovskite solar cell

10.1002/advs.201801170

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Citations (42)

Multidentate Chelation Heals Structural Imperfections for Minimized Recombination Loss in Lead‐Free Perovskite Solar Cells

Angewandte Chemie International Edition (2022)

Gengling Liu Yang Zhong Wenhuai Feng Meifang Yang Guo Yang

Tin-based perovskite solar cells (Sn-PSCs) have emerged as promising environmentally viable photovoltaic technologies, but still suffer from severe non-radiative recombination loss due to the presence of abundant deep-level defects in the perovskite film and under-optimized carrier dynamics throughout the device. Herein, we healed the structural imperfections of Sn perovskites in an "inside-out" manner by incorporating a new class of biocompatible chelating agent with multidentate claws, namely, 2-Guanidinoacetic acid (GAA), which passivated a variety of deep-level Sn-related and I-related defects, cooperatively reinforced the passivation efficacy, released the lattice strain, improved the structural toughness, and promoted the carrier transport of Sn perovskites. Encouragingly, an efficiency of 13.7 % with a small voltage deficit of ≈0.47 V has been achieved for the GAA-modified Sn-PSCs. GAA modification also extended the lifespan of Sn-PSCs over 1200 hours.

Lead (geology)

10.1002/anie.202209464

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Citations (67)

Global and Local Enhancement of Low-light Endoscopic Images

En Mou Huiqian Wang Meifang Yang Enling Cao Yuanyuan Chen

Endoscopic medical images can suffer from uneven illumination, low contrast, and lack of texture information due to the use of point directional light sources and the presence of narrow tissue structures, posing diagnostic difficulties for physicians. In this paper, a deep learning-based supervised illumination enhancement network is designed for low-light endoscopic images, aiming to improve both global illumination and local details. Initially, a global illumination enhancement module is formulated utilizing a higher-order curve function to improve global illumination. Secondly, a local feature extraction module incorporating dual attention is designed to capture local detailed features. Considering the significance of color fidelity in biomedical scenarios, the designed loss function prioritizes introducing color loss to alleviate image color distortion. Compared with seven state-of-the-art enhancement algorithms on Endo4IE endoscopic datasets, experimental results show that the proposed method can better enhance low-light endoscopic images and avoid image color distortion. It provides an efficient method to enhance images captured by endoscopes which can effectively assist clinical diagnosis and treatment.

Distortion (music)

Contrast Enhancement

Feature (linguistics)

10.20944/preprints202311.1954.v1

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Citations (2)

Achieving efficient flexible perovskite solar cells with room-temperature processed tungsten oxide electron transport layer

Journal of Power Sources (2019)

Fengyou Wang Yuhong Zhang Meifang Yang Jinyue Du Lili Yang

10.1016/j.jpowsour.2019.227157

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Citations (32)

Multidentate Chelation Heals Structural Imperfections for Minimized Recombination Loss in Lead‐Free Perovskite Solar Cells

Angewandte Chemie (2022)

Gengling Liu Yang Zhong Wenhuai Feng Meifang Yang Guo Yang

Abstract Tin‐based perovskite solar cells (Sn‐PSCs) have emerged as promising environmentally viable photovoltaic technologies, but still suffer from severe non‐radiative recombination loss due to the presence of abundant deep‐level defects in the perovskite film and under‐optimized carrier dynamics throughout the device. Herein, we healed the structural imperfections of Sn perovskites in an “inside‐out” manner by incorporating a new class of biocompatible chelating agent with multidentate claws, namely, 2‐Guanidinoacetic acid (GAA), which passivated a variety of deep‐level Sn‐related and I‐related defects, cooperatively reinforced the passivation efficacy, released the lattice strain, improved the structural toughness, and promoted the carrier transport of Sn perovskites. Encouragingly, an efficiency of 13.7 % with a small voltage deficit of ≈0.47 V has been achieved for the GAA‐modified Sn‐PSCs. GAA modification also extended the lifespan of Sn‐PSCs over 1200 hours.

Passivation

Carrier lifetime

10.1002/ange.202209464

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Citations (26)