The team of Wang Zhen/Jiang Yue/Gao Jinwei from the South China Institute of Advanced Optoelectronics has published important research results continuously in

• In recent years, organic-inorganic hybrid perovskite solar cells have achieved rapid development, with photoelectric conversion efficiency increasing from the initial 3.8% to 26.1%, making them an important competitor for the new generation of photovoltaic materials. In battery devices, material stability and preparation processes are crucial to battery efficiency. Co-solvent engineering, additive engineering and dimensional engineering are of great significance to improving cell efficiency and stability and promoting the commercial development of perovskite solar cells.The team explored the following questions:

  
  

  (1) The self-assembled 3D/0D quasi-core-shell structure inner encapsulation layer helps realize stable and efficient FAPbI3 perovskite solar cells.

  
  

  In recent years, formamidine lead iodide-based (FAPbI3) perovskite solar cells have attracted much attention due to their excellent thermal stability and ideally close to the theoretical band gap and efficiency. However, its inherent phase instability poses a huge challenge to the long-term stability of the device. Recently, the Wang Zhen/Gao Jinwei team of the South China Institute of Advanced Optoelectronics collaborated with Hu Xiaowen's research group to achieve a synergistic effect through dual strategies - PbI2 in-situ self-passivation strategy and self-assembled 3D/0D quasi-core-shell structure inner encapsulation layer, passivated surface and Grain boundary defects minimize non-radiative recombination and improve the stability of FAPbI3 perovskite films. Finally, a photoelectric conversion efficiency (PCE) of 23.23% was obtained on the small-area device, and a PCE of 19.51% was obtained on the module device (5 × 5 cm2). In addition, the device has good humidity stability, retaining 80% of the initial efficiency after aging for 3500 hours at 40% relative humidity (RH). This study provides valuable insights and research directions for the development of stable and efficient FAPbI3 perovskite solar cells.

  
  

  Associate Researcher Wang Zhen, Associate Researcher Hu Xiaowen and Professor Gao Jinwei are the co-corresponding authors. Wang Yuqi, a master’s student jointly supervised by Professor Gao Jinwei and Associate Researcher Wang Zhen, is the first author of the paper.

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• Original link:

  
  

  https://onlinelibrary.wiley.com/doi/10.1002/smll.202306954

  
  

  (2) Supramolecular polyurethane dynamic “ligaments” enhance the mechanical flexibility and self-healing ability of perovskite films

  
  

  To address issues such as the mechanical stability of flexible perovskite solar cells (F-PSCs), the Gao Jinwei/Jiang Yue team introduced dynamic "ligaments" composed of supramolecular PDMS polyurethane (DSSP-PPU) into the grain boundaries of perovskite solar cells. Promote the release of residual stress and the softening of grain boundaries. This dynamic "ligament" exhibits excellent self-healing properties and is able to heal cracks in perovskite films at room temperature. Finally, photoelectric conversion efficiencies (PCE) of 23.73% and 22.24% were achieved on the rigid substrate and flexible substrate respectively, and the flexible module device also achieved a PCE of 17.32%. Notably, after the F-PSCs were subjected to 8000 bending cycles (r = 2 mm), the F-PSCs still maintained nearly 80% of their initial efficiency and further recovered to nearly 90% of their initial efficiency through the room temperature self-healing process. %. The flexible and self-healing "ligament" strategy provides a simple and effective solution to improve the durability and performance of F-PSCs and facilitate the commercial application of F-PSCs.

  
  

  Associate researcher Jiang Yue and Professor Gao Jinwei are the co-corresponding authors. The doctoral candidate Yang Zhengchi, who is jointly supervised, is the first author of the paper. Associate researcher Wang Zhen, Professor Gaoxingsen, Professor Lu Xubing and Professor Zhou Guofu of our school are the main authors. Our school is the first author. One completed unit.

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• Original link:

  
  

  https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.202307186
  

  
  

  (3) Co-solvent engineering strategy helps prepare efficient and stable perovskite solar cells through anti-solvent-free process

  
  

  Based on the common problems in the preparation process of perovskite films, the Gao Jinwei/Wang Zhen team collaborated with Feng Yancong's research group to propose a simple and effective co-solvent engineering strategy to obtain high-quality perovskite films. The mineral component (FAI or PbI2, etc.) has strong coordination ability, and the co-solvent (MCP, NMP, DMI) with weak interaction with the main solvent (DMF) can quickly remove the main solvent during the spin process to adjust the concentration. To trigger nucleation, while the presence of the intermediate phase delays crystallization, uniform and dense perovskite polycrystalline films are prepared without the use of antisolvents, and are also suitable for the preparation of larger-area devices. With this strategy, PCEs of 22.00% and 18.02% were obtained over the area and large active area (1 cm2), respectively. The module device obtains 16.54% PCE. At the same time, NMP-based PSCs showed high reproducibility and good stability (80% PCE can still be maintained after 30 days of storage under air conditions). This strategy provides a simple and effective method to prepare efficient and stable perovskite solar cells and modules, promoting their large-scale commercial application.

  
  

  Associate Researcher Wang Zhen, Associate Researcher Feng Yancong and Professor Gao Jinwei are the co-corresponding authors. Master student Li Gu, who is co-supervised, is the first author of the paper. Associate Researcher Jiang Yue and Professor Zhou Guofu of our school are the main authors. Our school is the first to complete the paper. unit.

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• Original link:

  
  

  https://onlinelibrary.wiley.com/doi/abs/10.1002/smll.202301323
  

  
  

  Wang Zhen: Talent introduction from the "Young Talents" of South China Normal University, associate researcher, master's tutor. The main research directions are perovskite photovoltaic devices and organic optoelectronic materials and devices. Published more than 10 high-quality research papers (6 papers with IF>10) in authoritative international academic journals such as Advanced Energy Materials, Advanced Functional Materials, Advanced Science, Journal of Material Chemistry A, Solar RRL, ACS Applied Materials & Interfaces, etc. Hosted the National Natural Science Foundation Youth Fund Project, Postdoctoral Fund General Project, etc.

  
  

  Jiang Yue: Graduated from South China University of Technology and the University of Angers (France National Science Center CNRS, Moltech-Anjou Institute), and received double doctorate degrees. In 2015, he joined Gao Jinwei's team at the South China Advanced Optoelectronics Research Institute as a young talent, and was appointed as an associate researcher in 2019. Research interests include: perovskite solar cells, organic solar cells, piezochromic and electrochromic materials and devices. Published more than 30 original papers as the first author/corresponding author in journals such as Advanced Materials, Energy & Environmental Science, Nature Communication, etc.; was approved by the National Natural Science Foundation, Guangdong Natural Science Foundation, Guangzhou Basic and Applied Basic Research Project, etc. 

  
  

  Gao Jinwei: Professor and doctoral supervisor at South China Normal University. "Top Ten Emerging Scientific and Technological Figures" in China, core member of the local innovation and entrepreneurship team of "Guangdong Provincial Special Support Plan", "Outstanding Teacher of South Guangdong" by the Guangdong Provincial Department of Education; editor of the international journal Surfaces and Interfaces, Science Talk, Frontiers in Nanotechnology; Chinese Energy Society Special Committee on Energy Experts. So far, he has published more than 150 SCI papers and more than 40 papers in high impact factor (IF>10) journals such as Nature Communications, Advanced Materials, Energy & Environmental Science, and Advanced Functional Materials. Invited to write 4 long review papers for Advances in Physics, Advanced Functional Materials, etc. His papers have been cited nearly 7,000 times (Google Scholar, h-index 37), and he has 3 ESI highly cited papers.
  

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