journal article·2024-08-07

Oxygen Switchable Photo-Hydrovoltaic Effect along the Silicon–Water Interface

Jidong Li, Han Sheng, Yuyang Long, Yunfei Zhang, Chenwei Fu, Xuemei Li, Wanlin Guo, Jun Yin

ACS Applied Materials & Interfaces· Volume 16· Issue 31
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Abstract

Moving boundaries of electrical double layers have shown promising capability in driving directional electron flows in solids, leading to a range of hydrovoltaic effects. The recent discovery of a photohydrovoltaic phenomenon utilizes a moving illumination zone to generate moving boundaries with different properties at the solid-water interface, referred to as the kinetic photovoltaic effect. Here, oxygen was found to act as a chemical switch to turn on and off the kinetic photovoltaic effect. Introducing oxygen would rapidly diminish the kinetic photovoltage in p-Si. On the contrary, degassing oxygen leads to a gradual recovery, whose rate can be facilely speeded up by more than one order through electrostatic gating. Mechanistic investigations of the oxygen switch behavior uncovered a dependence of surface band bending intensity of silicon on oxygen adsorption, which highlights the role of gas molecules, often overlooked, in applications based on semiconductor-liquid interfaces, such as photoelectrochemistry.
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Research context

OpenAlex topics: Solar-Powered Water Purification Methods · Nanowire Synthesis and Applications · Electrowetting and Microfluidic Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Mechanics and Control for Aerospace Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China

Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China

College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China

College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, P. R. China

Funding

National Key Research and Development Program of China · Nanjing University of Aeronautics and Astronautics · China Postdoctoral Science Foundation · Natural Science Foundation of Jiangsu Province · Fundamental Research Funds for the Central Universities · National Natural Science Foundation of China · State Key Laboratory of Mechanics and Control for Aerospace Structures, Nanjing University of Aeronautics and Astronautics

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