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Array of single crystalline anatase TiO2 nanotubes with significant enhancement of photoresponse

Progress in Natural Science:Materials International 2021年第4期31卷 536-540页

作者： Lvchao Qiu Ke Fang Yubo Li Shutao Huang Guanxing Li Songda Li Hu He Wentao Yuan Hangsheng Yang Wei Tian Yong Wang State Key Laboratory of Silicon Materials School of Materials Science and Engineering Zhejiang University Center of Electron Microscopy School of Materials Science and Engineering Zhejiang University Key Laboratory of Micro-Nano Electronic Device and Smart System of Zhejiang Province College of Information Science & Electronic Engineering Zhejiang University School of Physical Science and Technology Soochow University

Anatase TiO2nanotubes array（ATONA） has attracted tremendous attention owing to its promising applications in solar cells, water splitting and organic pollutants photocatalytic degradation. However, the activity of ATONAs was greatly suppressed by the grain boundaries existed in the tube walls, which acted as carrier scattering and recombination centers. Herein, we report a novel strategy to prepare array of single crystalline anatase TiO2nanotubes（SC-ATONAs） with significant enhancement of the photocatalytic activity and UV photo response performance compared to the polycrystalline counterparts. The growth of SC-ATONAs was achieved by establishing a crystallization temperature gradient along the tube wall, which ensured the crystallization started from the nucleation of a single nucleus at the bottom of amorphous TiO2nanotubes prepared by Ti anodization. These findings pave the way to prepare single-crystalline nanotubes with superior performance for other materials.

关键词： Single crystallineTiO2 nanotube Crystallization temperature gradient photo response photocatalysis

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Highly responsive biosensors based on organic field-effect transistors under light irradiation

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Chinese Chemical Letters 2021年第11期32卷 3364-3367页

作者： Xiaoqian Jiang Chenfang Sun Congcong Zhang Shanshan Cheng Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic Sciences School of ScienceTianjin UniversityTianjin 300072China Institute for Advanced Interdisciplinary Research University of JinanJi'nan 250011China

High responsivity and sensitivity play essential roles in the development of organic field-effect transistors(OFETs)-based biosensors with regard to biological detections,particularly for disease ***,how to design a biosensor which improves these two outstanding properties while achieving low cost,easy processing,and time saving is a daunting ***,a novel biosensor based on OFET with copolymer thin film,whose surface is illuminated with a suitable light beam is *** film can be used as both an organic semiconductor material and as a photoelectric active *** to amplification of signals as a result of the film’s strong response to light,the biosensor possesses higher responsivity and sensitivity compared to dark condition and even realizes a maximum responsivity of up to 10^(3)for alpha-fetoprotein(AFP)*** simple combination of light and transistor builds a bridge between photoelectric effect and biological *** addition,the emergence of more excellent photoelectric active materials is expected to pave a way for ultrasensitive bio-chemical diagnostic tools.

关键词： Organic field-effect transistors photoelectric active materials photo response Biosensors Disease diagnosis

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Effect of Temperature on photovoltaic Solar Cell Cadmium Telluride Thin Film

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Advances in Materials Physics and Chemistry 2023年第1期13卷 1-15页

作者： Kishan C. Rathod Vishalkumar R. More Jayashree S. Kshirsagar Santosh R. Sonwane Kallapa R. Sanadi Pradip D. Kamble Ganesh S. Kamble Sandip V. Mahamuni Muddsar L. Gaur Yong-Chein Ling Department of Chemistry The New College Kolhapur Department of Chemistry Doodhsakhar Mahavidyalaya Kolhapur Department of Physics The New College Kolhapur Department of Engineering Chemistry KIT Engineering College Kolhapur Department of Chemistry Sadguru Gadage Maharaj College Karad Department of Chemistry C. B. Khedgi’s Basaveshwar Science Raja Vijaysinh Commerce and Raja Jaysinh Arts College Ak-kalkot Department of Chemistry National Tsing Hua University Hsinchu City

Solar cell technology comes with unique temperature coefficients. These temperature coefficients are important and temperature of the solar cell has direct influence on the power output of a photovoltaic cells. CdTe is a very robust and chemically stable material and for this reason its related solar cell. Thin film photovoltaic technology is now the only thin film technology in the first top 10 producers in the world. The strong improvement in efficiency in the last 7 years was obtained by a new redesign of the CdTe solar cell device reaching a single solar cell. In this paper, we describe the fabrication process following the history of the solar cell as it was developed in the early years up to the latest development and changes. The configuration of fabricated cell is n-CdTe/NaOH (0.15 M) + S (0.15 M) + Na2S (0.15 M)/C(graphite). The junction ideality factor was found to be 2.63, 2.13, and 1.89. The flat band potential is found to be -0.400, -0.450, -0.501 V. The barrier height value was found to be 0.523, 0.487, and 0.436 eV. The study of power output characteristic shows open circuit voltage, short circuit current, fill factor and efficiency were found to be 120 mV, 24.2 μA, 32.68%, 26.18%, and 19.73% and 0.63%, 0.37%, and 0.23%, respectively. The lighted ideality factor was calculated and found to be 3.26, 1.87, and 1.17. Spectra attain maximum value of current at λ = 580 nm and decrease with increase in wavelength. The photovoltaic cell characterization of the thin films is carried out by studying current-voltage characteristics in dark, capacitance-voltage in dark, barrier height measurements, power output characteristics.

关键词： CBD Power Output Barrier Height photo response Spectral response

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