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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.  Since 2017, he joined Tsinghua University as a principal investigator. He has published over 80 papers in high impact journals such as Science, Joule and Science Advances etc., with citation of over 1,8000.

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 semi-transparent and flexible solar cells as well as 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

Clean Energy-Writing and Communication

1. Improve the stability of perovskite solar cells by reinforcing their mechanical properties

2. Integrated solar charging battery

3. Semitransparent solar cells

4. Flexible solar cells

(1). Selected Publications:

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

1. Wang, S.; Tan, L.; Zhou, J.; Li, M.; Zhao, X.; Li, H.; Tress, W.; Ding, L.; Graetzel M.; Yi, C.* Over 24% efficient MA-free CsxFA1-xPbX3 perovskite solar cells. Joule 2022, 6, 1344-1356.

2. Li, H.; Zhou, J.; Tan, L.; Li, M.; Jiang, C.; Wang, S.; Zhao, X.; Liu, Y.; Zhang, Y.; Ye, Y.; Tress, W.; Yi C.* Sequential vacuum-evaporated perovskite solar cells with more than 24% efficiency. Science Adv. 2022, 8, eabo7422.

3. Zhou, J.#; Li, M.#; Wang, S.#; Tan, L.; Liu, Y.; Jiang, C.; Zhao, X.; Ding, L.; Yi, C.* 2-CF3-PEAI to eliminate Pb0 traps and form a 2D perovskite layer to enhance the performance and stability of perovskite solar cells. Nano Energy, 2022, 95, 107036

4. Zhang, Y.; Liu, Y.; Zhou, J.; Wang, D.; Tan, L.; Yi, C.* 3D cubic framework of fluoride perovskite SEI inducing uniform lithium deposition for air-stable and dendrite-free lithium metal anodes. Chem. Eng. J. 2022, 431, 134266.

5. 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.

6. 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.

7. 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 ABX3 metal halide perovskites for high performance perovskite solar cells. Energy Environ. Sci. 2016, 9 (2), 656-662.

8. 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%. Nat. Energy 2016, 1, 16142.

9. 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. Nat. Chem. 2015, 7, 703-711.

10. 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.

(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).

1. Vice director-Expert commitee of Chinese Society for Imaging Science and Technology division of Optoelectronic Materials and Devices

2. Commitee member-Expert comitee of Chinese Materials Research Society division of Solar Energy Materials

3. Associate Editor-iEnergy