题　目：Engineering Electrode Structures for Dye and Perovskite Sensitized Solar Cells
报告人：Tao Chen 博士（Department of Physics, The Chinese University of Hong Kong,） 

时　间：11月3日（周一），上午10:00-11:00
地    址：南校区第一实验楼423会议室

Abstract

Conversion of solar energy into electricity through photovoltaic effect is one of the most promising approaches to alleviate energy crisis in the future. Mesoscopic solar cells, such as dye-sensitized solar cell and perovskite solar cell, are new generation solution-processable devices. The low-cost fabrication, colourful, and transparent characteristics make them attractive for practical applications. In this talk, I will introduce our recent work on the improvement of light harvesting efficiency by engineering the electrode structures.

Firstly, I will present the plasmon-enhanced dye-sensitized solar cells. Plasmonic Au nanorod is found to improve the longer wavelength light harvesting and the TiO₂ encapsulated Au nanparticle can serve as scattering layer for reducing the film thickness.^{1, 2}

Afterwards, I will introduce the conformational engineering of cosensitizers (e.g. porphyrin and phenothiazine based molecules) in dye-sensitized solar cells.^3-5The post-adsorption of smaller molecules (phenothiazine) can make up the interstitial site of the large molecules (porphyrin) on the TiO₂ surface, which in turn generates two advantages: (i) impeding the back charge transfer and (ii) improve the light harvesting efficiency.  

I will finally talk about our fundamental investigation on the reaction kinetics and crystallization process in the synthesis of organolead halide perovskite. In this work, a method to precisely control the crystal size domain is developed, which ultimately leads to an improvement of the device efficiency by 22.3%.

Reference:

1. S. Chang, Q. Li, X. Xiao, K. Y. Wong and T. Chen, Energy Environ. Sci., 2012, 9444-9448.
2. C. Fang, H. Jia, S. Chang, Q. Ruan, P. Wang, T. Chen and J. Wang, Energy Environ. Sci., 2014, 7, 3431-3438.
3. S. Chang, H. Wang, Y. Hua, Q. Li, X. Xiao, W.-K. Wong, W. Y. Wong, X. Zhu and T. Chen, J. Mater. Chem. A, 2013, 1, 11553-11558.
4. S. Chang, H. Wang, L. T. Lin Lee, S. Zheng, Q. Li, K. Y. Wong, W.-K. Wong, X. Zhu, W.-Y. Wong, X. Xiao and T. Chen, J. Mater. Chem. C, 2014.
5. L. T. L. Lee, J. He, B. Wang, Y. Ma, K. Y. Wong, Q. Li, X. Xiao and T. Chen, Sci. Rep., 2014, 4, 4063.

Brief CV

Dr. CHEN Tao is now a Research Assistant Professor in the Department of Physics, the Chinese University of Hong Kong (CUHK). He received his Ph.D in Chemistry from Nanyang Technological University (Singapore) in 2010. His Ph.D. study focuses on the synthesis, property and assembly of semiconducting and noble metal nanostructures. After graduation, he did one-year postdoctoral research at the same university, where he made effort into solar cell investigation. In 2011, he joined the Department of Physics of CUHK and conducted research in the dye-sensitized solar cells and perovskite solar cells. Dr. Chen has delivered invited talks for several academic conferences, contributed two invited book chapters and published more than 40 papers in J. Am. Chem. Soc., Appl. Phys. Lett., Energy Environmental Sci., ACS Nano., etc..