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Chunqian Zhang

Beijing Information Science & Technology University

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Junming Li

Huazhong University of Science and Technology

Yifei Wang

Fujian Institute of Research on the Structure of Matter

Xiaotong Li

Northeast Electric Power University

Keke Song

First Affiliated Hospital of Xi'an Jiaotong University

Baokai Ren

Beijing Information Science & Technology University

Xiaoping Zou

Nanjing Drum Tower Hospital

Jin Cheng

Beijing Information Science & Technology University

Xinyao Chen

Eye & ENT Hospital of Fudan University

Jialin Zhu

Beijing Information Science & Technology University

Wenqi Huang

Beijing Information Science & Technology University

Cooperative Institutions

Beijing Information Science & Technology University

Chinese Academy of Sciences

China Pharmaceutical University

University of Chinese Academy of Sciences

Beijing Institute of Technology

Huazhong University of Science and Technology

Chinese Academy of Medical Sciences & Peking Union Medical College

Peking University

University of Science and Technology Beijing

Xi'an Jiaotong University

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Effect of polarization on performance of inverted solar cells based on molecular ferroelectric Hexane-1,6-diammonium pentaiodobismuth without electron transport layer

Materials Letters (2021)

Xiaolan Wang Xiaoping Zou Jialin Zhu Chunqian Zhang Jin Cheng

Photoelectric effect

Open-circuit voltage

10.1016/j.matlet.2021.130951

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Citations (1)

A Systematical Study on Bands and Defects of Csbx3 (B=Pb, Sn, Ge, X=Cl, Br, I) Perovskite Based on First Principles

SSRN Electronic Journal (2022)

Hao Wang Chunqian Zhang Wenqi Huang Xiaoping Zou Yuhua Zuo

Recently, metal halide perovskites, which are known for their excellent optical and electrical properties, have attracted considerable attention as novel optoelectronic materials. Inorganic perovskites (CsPbX3, X=Cl, Br, I) are now viable alternative candidates for third generation photovoltaic technology because of their high photoelectric conversion efficiency, high carrier mobility, good defect tolerance, simple preparation method and many other advantages. Although lead halide perovskites provide many superior characteristics, the toxicity of lead is problematic for the practical implementation. Thus, the fabrication of lead-free perovskite materials and devices has been conducted very actively. In this work, the energy band and photoelectric properties of the inorganic perovskites CsBX3 (B=Pb, Sn, Ge, X=Cl, Br, I) have been investigated with the first principles calculation, especially the possible defect energy levels and their formation energies in different components of the materials have been systematically studied and compared. The advantages and disadvantages of Sn and Ge as replacement elements for Pb have been demonstrated from the perspective of defects. This study provides an important basis for the study of the properties and applications of lead-free perovskites.

10.2139/ssrn.4303389

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Understanding different oxidation methods for the hole transport layer Spiro-OMeTAD to improve perovskite solar cell performance

Physica Scripta (2024)

Xinyao Chen Linfeng He Chunqian Zhang Jin Cheng Yuan Liu

Abstract The preparation of a high-performance hole transport layer is a pivotal factor in achieving efficiency and stable perovskite solar cells. 2,2’,7,7’-Tetrakis[N, N-di(4-methoxyphenyl)amino]−9,9’-spirobifluorene (Spiro-OMeTAD) currently stands as the most widely employed hole transport material in high-performance perovskite solar cells. The current methodologies for its preparation primarily revolve around three techniques: O 2 oxidation, cobalt salt doping, and CO 2 bubbled doping. In this study, we systematically investigated and analyzed Spiro-OMeTAD prepared through these three methods, from solution and film to device. The CO 2 -bubbled method and Co-doped method allow for faster and more complete oxidation of Spiro-OMeTAD while maintaining conductivity and energy level matching. Therefore, the film of both methods shows better carrier extract capabilities and defect states than that of O 2 -oxidized. In particular, the film of the CO 2 -bubbled method had better hydrophobicity and thermal stability, showing the least degradation at 85 °C annealing, which can be attributed to the removal of hydrophilic Li + . This study could inspire further optimization of Spiro-OMeTAD film fabrication processes in perovskite solar cells.

Perovskite solar cell

10.1088/1402-4896/ad685f

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The Defect Passivation of Tin Halide Perovskites Using a Cesium Iodide Modification

Molecules (2023)

Linfeng He Jin Cheng Longjiang Zhao Xinyao Chen Xiaoping Zou

Tin-based perovskites are promising for realizing lead-free perovskite solar cells; however, there remains a significant challenge to achieving high-performance tin-based perovskite solar cells. In particular, the device fill factor was much lower than that of other photovoltaic cells. Therefore, understanding how the fill factor was influenced by device physical mechanisms is meaningful. In this study, we reported a method to improve the device fill factor using a thin cesium iodide layer modification in tin-based perovskite cells. With the thin passivation layer, a high-quality perovskite film with larger crystals and lower charge carrier densities was obtained. As a result, the series resistance of devices was decreased; the shunt resistance of devices was increased; and the non-radiative recombination of devices was suppressed. Consequently, the fill factor, and the device efficiency and stability were greatly enhanced. The champion tin-based perovskite cells showed a fill factor of 63%, an efficiency of 6.1% and excellent stability. Our study reveals that, with a moderate thin layer modification strategy, the long-term stability of tin-based PSCs can be developed.

Passivation

Carrier lifetime

10.3390/molecules28176414

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Investigation on Film Quality and Photophysical Properties of Narrow Bandgap Molecular Semiconductor Thin Film and Its Solar Cell Application

Coatings (2021)

Xiaotong Li Xiaoping Zou Chunqian Zhang Jin Cheng Guangdong Li

Hexane-1,6-diammonium pentaiodobismuth (HDA-BiI5) is one of the narrowest bandgap molecular semiconductor reported in recent years. Through the study of its energy band structure, it can be identified as an N-type semiconductor and is able to absorb most of the visible light, making it suitable to fabricate solar cells. In this paper, SnO2 was used as an electron transport layer in HDA-BiI5-based solar cells, for its higher carrier mobility compared with TiO2, which is the electron transport layer used in previous researches. In addition, the dilution ratio of SnO2 solution has an effect on both the morphology and photophysical properties of HDA-BiI5 films. At the dilution ratio of SnO2:H2O = 3:8, the HDA-BiI5 film has a better morphology and is less defect inside, and the corresponding device exhibited the best photovoltaic performance.

10.3390/coatings11111300

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Effect of anti-solvent chlorobenzene on bottom micro-porous structure of perovskite light-absorbing layer

Materials Letters (2021)

Yifei Wang Xiaoping Zou Jialin Zhu Chunqian Zhang Jin Cheng

Chlorobenzene

Spin Coating

Perovskite solar cell

10.1016/j.matlet.2021.130430

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Rapid-response humidity sensors based on ultra-thin films stacked with single-layer graphene oxide

Results in Chemistry (2024)

Junyi Zhu Yang Cao Hao Chen Bo Fan Xiaoping Zou

Monitoring and control of humidity is important for industry, agriculture and human activities. Currently, it is achallengeto develop highly sensitive humidity sensors with both the response time and recovery time less than 1 s.Therefore, it isdifficult to dynamically monitor rapid changes in humidity. Here, we report a resistive humidity sensor based on an ultrathin graphene oxide (GO) film, which is formed by stacked single-layered GO. Both the response and recovery time of the sensor is less than 1 s in the range of 10 %–95 % relative humidity (RH). The shortest response and recovery time of the reported GO-based resistive humidity sensor can be 0.33 s at 10 % RH, indicating the fastest response and recovery property to date. Moreover, the sensor is sensitive, and it can accurately detect the distance between the sensor and the human finger as well as the strength of the human breath. The simple preparation, microscale structure, and extremely fast response make the GO-based sensor a new alternative for integrated humidity sensors with real-time monitoring functions.

Resistive touchscreen

Response time

Microscale chemistry

10.1016/j.rechem.2024.101444

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Photodetector without Electron Transport Layer Based on Hexane-1,6-Diammonium Pentaiodobismuth (HDA-BiI5) Molecular Semiconductor

Coatings (2021)

Yifei Wang Xiaoping Zou Jialin Zhu Chunqian Zhang Jin Cheng

With the development of the semiconductor industry, research on photoelectronic devices has been emphasized. In this paper, a molecular semiconductor material with a narrow bandgap of hexane-1,6-diammonium pentaiodobismuth (HDA-BiI5) was utilized to prepare photodetectors without electron transport layers. Using a single light source, the effects of different wavelengths and different powers on the photoresponsivity, switching ratio, specific detectivity, and external quantum efficiency of the device were investigated. It is demonstrated that this device has excellent responsivity, specific detectivity, stability, and repeatability, and this work will help expand the application of molecular semiconductor materials for photodetection.

Photodetection

Quantum Efficiency

Organic semiconductor

10.3390/coatings11091099

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Research progress of ABX₃-type lead-free perovskites for optoelectronic applications: materials and devices

Physical Chemistry Chemical Physics (2022)

Hao Wang Chunqian Zhang Wenqi Huang Xiaoping Zou Zhenyu Chen

In recent years, lead halide perovskite materials have attracted great interest and are widely used in solar cells and light-emitting devices due to their high photoelectronic quantum yield, high color purity, high defect tolerance, long diffusion length, high carrier mobility, and bandgap tunability. However, the application of lead halide perovskites is limited due to the presence of Pb, making lead-free perovskites an important substitute due to their same crystal structure and similar properties. Although some reports have been made on lead-free perovskite materials, there are still great challenges to realize their application due to their poor stability, easy phase transition, and low photoelectric conversion efficiency. Here, we mainly summarize the development and application of ABX3-type lead-free halide perovskite materials, especially in optoelectronic devices. The article first introduces the lattice and energy band structure, the optoelectronic properties of lead-free perovskites, including the research method of lead-free perovskites, and then analyzes the reasons for the low luminous efficiency and poor stability of lead-free perovskite materials. Second, the development history and current situation of lead-free perovskites in different optoelectronic device applications are summarized. Finally, we present the challenges and prospects for the future development of lead-free perovskites.

ABX test

Lead (geology)

10.1039/d2cp02451a

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Citations (18)

Research on the reflectivity of the end face of film-coated optic fiber for application in fiber optic Fabry-Perot cavity hydrophone

Mingkai Gu Jin Cheng Lei Qin Chunqian Zhang Junming Li

Fiber optic Fabry-Perot cavity hydrophones have the advantages of high sensitivity, simple structure and the resistance to electromagnetic interference, making them a research hotspot. Filling the Fabry-Perot cavity with water media would lead to a decrease in the reflectivity of the fiber end face, thus causing a decrease in the sensitivity of the fiber FP cavity hydrophone. In this work, the magnetron sputtering technology was utilized with alumina as the sputtering target. A thin film was deposited to the end face of the optical fiber to improve the reflectivity of the end face of the fiber. Coated fibers with varied film thicknesses were prepared and their reflectivity was characterized. The experimental results showed that the reflectivity of the end face of the optical fiber in water media can be increased by an order of magnitude to 2.61%, which is an excellent basis for the development of a highly sensitive optical fiber Fabry-Perot cavity hydrophone.

Hydrophone

10.1117/12.2671371

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