Prof. Hui Zhou Profile

Prof. Hui Zhou

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Proceedings Article | 13 December 2024 Paper

Study on the effect of different spectral splitting strategies on the efficiency of micro-concentrator systems

Lei Tang, Yu Gao, Hui Zhou, Yanguo Zhang, Qinghai Li

Proceedings Volume 13497, 134970G (2024) https://doi.org/10.1117/12.3048181

KEYWORDS: Energy efficiency, Solar energy, Solar cells, Solar energy systems, Beam splitters, Design, Photovoltaics, Analytical research, External quantum efficiency, Engineering

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The hybrid concentrating photovoltaic/thermal collector (CPVT) system utilizing beam splitting has tremendous potential for solar energy production. Spectral splitting allows for the decoupling of photovoltaic and photothermal processes, resulting in reduced temperature rise of the photovoltaic cells. This also ensures that the output heat energy of the photothermal module is not limited by the operating temperature of the PV cell, allowing for simultaneous generation of high-temperature thermal energy while maintaining high cell efficiency. While extensive research has been conducted to enhance the performance of photovoltaic cells under high temperatures and concentration ratios, few studies have investigated the impact of spectral beam splitting strategies on overall system performance. This work analyzed four computational methods for spectral splitting strategies (SSS) to evaluate their effectiveness using performance metrics. The conclusions drawn from this analysis are then used to identify the most suitable spectral splitting strategy for monocrystalline silicon photovoltaic cells. Furthermore, a novel CPVT system design based on micro-concentrator (MCT)system is proposed in this research. Using Zemax19 software for modeling, simulation, and theoretical calculations, a comprehensive evaluation of this system's performance was conducted while incorporating an optimal spectral splitting strategy. The analysis of the four computational methods indicates that integrating the energy efficiency method with the exergy efficiency method can achieve precise spectral splitting, ensuring theoretically optimal system performance. The simulation results reveal that due to suboptimal system design, both the energy efficiency and exergy efficiency of the system deviate significantly from the theoretical values, leaving considerable room for improvement.

Proceedings Article | 12 April 2023 Paper

Effects of RbI doping on perovskite film and photovoltaic performance

Yu Gao, Hui Zhou, Yanguo Zhang, Xiaoxiao Yang, Kunlin Cong, Zhongchao Tan, Qinghai Li

Proceedings Volume 12565, 1256512 (2023) https://doi.org/10.1117/12.2661866

KEYWORDS: Perovskite, Doping, Photovoltaics, Solar cells, Solar energy

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Perovskite solar cells are brought into sharp focus by their high-power conversion efficiencies and low costs. However, their photovoltaic performances are severely limited by the defects of perovskite films. In this study, we composed perovskite films with a two-step method and doped RbI into the precursor solution. The morphologies of perovskite films were measured with scanning electron microscope (SEM), ultraviolet visible absorption spectroscopy (UV-Vis), Xray diffraction (XRD) and photoluminescence spectroscopy (PL), and photovoltaic properties were determined with solar simulator. The effects of different RbI concentrations on film morphology and photovoltaic performance of the perovskite films were investigated in this work. Results show that doping with RbI of low-concentration is instrumental to the grain size and film morphology and enhances the absorbance of 400-580 nm spectrum. However, high-concentration doping is detrimental to the perovskite film, resulting in more holes on surface and diminished absorbance. The best doping concentration of RbI is 10 mg/mL. Comparing with undoped perovskite film, the grain size increased from 500-1000 nm to 1-2 μm, and short-circuit current density is increased from 23.48 mA/cm² to 23.73 mA/cm², with 10 mg/mL RbI doped into the precursor solution. This study not only helps optimize the perovskite film morphology, but also help improve photovoltaic performance of perovskite solar cells.

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