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Current Location: Home > faculties > Yi Chenyi

Yi Chenyi

Associate Professor

Research Direction

Solar Energy Conversion and Storage, Perovskite Solar Cells

West Main Building 1-303, Department of Electrical Engineering, Tsinghua University 100084 Beijing, China



  • Biography
  • Teaching
  • Research Project
  • Publications
  • Social service

Chenyi Yi is currently an associate professor in Department of Electrical Engineering, Tsinghua University. He received his PhD in 2010 from University of Bern in Switzerland. Then, he joined laboratory of photonics and interfaces (led by Prof. Michael Graetzel) in EPFL as a postdoc fellow and research group leader. There he developed Y123 dye for dye-sensitized solar cells (DSSCs) and vacuum flash-assisted solution process for perovskite solar cells (PSCs). Since 2017, he joined Tsinghua University as a principal investigator. He has published over 50 papers in high impact journal such as Science, Energy Environmental Science and Advanced Materials etc., with citation over 9000.

His research interest is focused on light-driven electricity production and storage in a scalable, cost-efficient way. Basic and applied research will be combined to improve the stability of perovskite solar cells through further understanding and optimizing materials, interfaces and device structure. Special efforts will be put on developing new process for high efficiency large-area perovskite solar modules. Solar charging devices will be developed to mitigate the intermittent problem of photovoltaics. It will facilitate large scale deployment of PSCs contributing to fulfill the growing energy demand by renewable sources.

Education and Work experiences

2017-now Associate Professor Tsinghua University, China

2010-2017 Postdoc Fellow EPFL, Switzerland

2006-2010 PhD. University of Bern, Switzerland

2003-2006 Master Tsinghua University, China

1999-2003 Bachelor Xiangtan University, China

Awards and Honors

Dean’s Special Prize EPFL 2011

Chinese Oversea Outstanding Graduate Student Award 2009

Outstanding Graduate Award, Tsinghua University 2006

Best Master’s Thesis Award, Tsinghua University 2006

Outstanding Graduate Award, Xiangtan University 2003

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(1). Selected Publications:

* denoted for corresponding authors, # denoted for equal contributions.

1. Li, X.#; Bi, D.#; Yi, C.#; Decoppet, J. D.; Luo, J.; Zakeeruddin, S. M.; Hagfeldt, A.; Gratzel, M.*, A vacuum flash-assisted solution process for high-efficiency large-area perovskite solar cells. Science 2016, 353(6294), 58-62.

2. Yi, C.*; Li, X.; Luo, J.; Zakeeruddin, S. M.; Gratzel, M.*, Perovskite Photovoltaics with Outstanding Performance Produced by Chemical Conversion of Bilayer Mesostructured Lead Halide/TiO2 Films. Adv. Mater. 2016, 28 (15), 2964-2970.

3. Yi, C.; Luo, J.; Meloni, S.; Boziki, A.; Ashari-Astani, N.; Gratzel, C.; Zakeeruddin, S.M.; Rothlisberger, U.*; Gratzel, M.*, Entropic stabilization of mixed A-cation ABX(3) metal halide perovskites for high performance perovskite solar cells. Energy Environ. Sci. 2016, 9 (2), 656-662.

4. Zhang, F.; Yi, C.*; Wei, P.; Bi, X.; Luo, J.; Jacopin, G.; Wang, S.*; Li, X.; Xiao, Y.; Zakeeruddin, S.M.*; Grätzel, M.*, A Novel Dopant-Free Triphenylamine Based Molecular “Butterfly” Hole-Transport Material for Highly Efficient and Stable Perovskite Solar Cells. Adv. Energy Mater. 2016, 6. 1600401.

5. Bi, D.; Yi, C.; Luo, J.; Decoppet, J. D.; Zhang, F.; Zakeeruddin, S. M.; Hagfeldt, A.; Li, X.; Gratzel, M.*Polymer-templated nucleation and crystal growth of perovskite films for solar cells with efficiency greater than 21%. Nature Energy 1, 2016, 16142.

6. Li, X.; Dar, I.; Yi, C.; Luo, J.; Tschumi, M.; Zakeeruddin, S.M.; Nazeeruddin, M.K.; Han, H.; Gratzel, M.*, Improved performance and stability of perovskite solar cells by crystal crosslinking with alkylphosphonic acid omega-ammonium chlorides. Nature Chemistry 2015, 7 (9), 703-711.

7.Yella, A.; Lee, H.; Tsao, N.; Yi, C.; Chandiran, A.K.; Nazeeruddin, M.K.; Diau, E.*; Yeh, C.*; Zakeeruddin, S.M.*; Gratzel*, M., Porphyrin-Sensitized Solar Cells with Cobalt (II/III)-Based Redox Electrolyte Exceed 12 Percent Efficiency. Science 2011, 334 (6056), 629-634.

8. Zhang, W.; Wu, Y.; Bahng, H.; Cao, Y.; Yi, C.; Saygili, Y.; Luo, J.; Liu, Y.; Kavan, L.; Moser, J.; Hagfeldt, A.; Tian, H.; Zakeeruddin, S.; Zhu, W.; Gratzel, M.Comprehensive control of voltage loss enables 11.7% efficient solid-state dye-sensitized solar cells. Energy Environ. Sci. 2018, 11 (7), 656-662

9. Zhang, F.; Shi, W.; Luo, J.; Pellet, N.; Yi, C.; Li, X.; Zhao, X.; Dennis, T.; Li, X.; Wang, S.; Xiao, Y.; Zakeeruddin, S.; Bi, D.; Gratzel, M. Isomer-Pure Bis-PCBM-Assisted Crystal Engineering of Perovskite Solar Cells Showing Excellent Efficiency and Stability. Adv. Mater. 2017, 29, 1606806.

10.Leong, W.*; Ooi, Z.; Sabba, D.; Yi, C.; Zakeeruddin, S.M.; Graetzel, M.; Gordon, J. M.; Katz, E.A.; Mathews, N., Identifying Fundamental Limitations in Halide Perovskite Solar Cells. Adv. Mater. 2016, 28 (12), 2439-2445.

(2). Patents:

1. Yi, C.; Giordano, F.; Zakeeruddin, S.M.; Graetzel, M. Porphyrin based sensitizer for dye-sensitized solar cell (EP2883915, WO2015087210 A1).

2. Li, X.; Yi, C.; Bi, D.; Zakeeruddin S.M.; Graetzel, M.; Hagfedlt, A. High efficiency large area perovskite solar cells and process for producing the same Application (WO 2017158551 A2)

3. Ahn, H.; Jung, H.; Bae, H.; Park, C.; Lee, C.; Graetzel, M.; Nazeeruddin, M.K.; Yi, C.; Delcamp, J. Organic dyes with high molar absorption coefficient for dye-sensitized solar cells with good photoelectric conversion efficiency (WO 2012102544 A2).

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