The 29th International Conference on Amorphous and Nano-crystalline Semiconductors-Yonghua Chen (Topic 9)

Yonghua Chen

Flexible Thin Film Electronics

Key Laboratory of Flexible Electronics (KLoFE), College of Flexible Electronics (Future Technology), Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech), 30 South Puzhu Road, Nanjing 211816, Jiangsu, China.

Email: iamyhchen@njtech.edu.cn

Biography

Dr. Yonghua Chen is currently a full professor at Institute of Advanced Materials at Nanjing Tech University. He has got the Young 1000 Talents, Jiangsu Specially-Appointed Professor, Jiangsu Distinguished Young Scholars projects, and Jiangsu Province six talent peak projects. He has been focusing on perovskite photovoltaic cells in view of its efficiency and stability by taking ionic liquids as the main research line. The main representative results are as follows: 1) He has conceived and fabricated perovskite thin films based on environmentally-friendly ionic liquids instead of traditional commonly used toxic aprotic polar solvents, achieving highly efficient and stable perovskite solar cells. 2) He has proposed a new chemical control strategy for precursor solution, which stabilizes the layered perovskite framework and builds phase-pure layered perovskites. Highly efficient and stable two-dimensional layered perovskite photovoltaic cells were achieved. 3) A new method of ion channel reaction is proposed, stabilizing perovskite formation at room temperature and high humidity and achieving high efficiency and long-term stability. In last 5 years, as a correspondence author, he has published 70 papers (including Science, Nature Energy, Nature Photonics, Chem, Advanced Materials, Nano Letters, Angewandte Chemie International Edition, etc)

Abstract for Presentation

Proton ionic liquid for perovskite solar cells

Solvent is vital to control crystallization and crystal growth of the state-of-the-art solution-processed hybrid organic-inorganic perovskites. However, researchers just focus on the highly toxic and coordinating solvents (e.g., dimethylformamide, dimethylsulfoxide, and g-butyrolactone) and the based modification (e.g., antisolvent), which may hinder the success of perovskite solar cells (PSCs) in practical applications, and a largely serious unexplored challenge remains until now. Here, we report an alternative environment-friendly ionic liquid as a novel solvent for facile fabrication of PSCs in ambient air. Ionic liquid has excellent chemical properties with high viscosity, negligibly vapor pressure, and nonhazardous. Completely soluble of both ammonium and lead salts by hydrogen bonds in ionic liquid were observed. Dense and pinhole-free perovskite films with high reproducibility can be readily prepared by simple one-step method without anti-solvent even under the relative humidity over 80%. The findings may open up a new approach for further improving PSCs performance with higher reproducibility and reliability in ambient atmosphere.

References

1.   W. Hui, L. Chao, H. Lu, Y. Chen,* W. Huang,* et al Science, 371 (2021) 1359-1364.
2.   C. Liang, H. Gu, Y. Xia, Y. Chen,* G. Xing,* W. Huang,* et al Nat. Energy 6 (2021) 38-45.
3.   H. Ren, S. Yu, L. Chao, L. Zhang,* Y. Chen,* W. Huang,*et al “Efficient and stable Ruddlesden-Popper perovskite solar cell with tailored interlayer molecular interaction” Nat. Photonics 14 (2020) 154-163.
4.   L. Chao, Y. Xia, B. Li, G. Xing, Y. Chen,* Wei Huang,* “Room Temperature Molten Salt for Facile Fabrication of Efficient and Stable Perovskite Solar Cells in Ambient Air” Chem 5 (2019) 995-1006.
5.   X. Wang, X. Ran, X. Liu, H. Gu, Y. Xia*, Y. Chen,* and W. Huang,* et al “Tailoring Component Interaction for Air-Processed Efficient and Stable All-Inorganic Perovskite Photovoltaic” Angew. Chem. Int. Ed. 59 (2020) 13354-13361.