Breakthrough in Solvent Engineering for High-Performance Silver Sulfide Thin Film Solar Cells

Strategic Insights -

Researchers at Xuchang University have made a significant discovery in the field of solvent engineering, paving the way for the development of high-performance silver sulfide thin film solar cells. According to a peer-reviewed study published in the Journal of Engineering, the team has developed a specific solvent engineering train that enables the production of high-quality Ag2S absorber films with improved power conversion efficiency.

Key Takeaways:

  • The researchers propose a specific solvent engineering train that precisely tunes the dimethyl sulfoxide (DMSO)/N,N-dimethylformamide (DMF) constituent and post-deposition annealing temperature to produce high-quality Ag2S absorber films.
  • The optimized simple indium tin oxide (ITO)/Ag2S/2,2',7,7'-tetrakis(N,N-di-p-methoxyphenamine)-9,9'-spirobifluorene (Spiro-OMeTAD)/Au device exhibits a significant increase in power conversion efficiency from 0.77% to 2.57%, which is the highest value reported among Ag2S solar cells without an electron transport layer.
  • The study finds that a preferential transition in crystal orientation from (012) to (103) crystal planes plays a key role in photo-induced carrier behavior, while the film surface morphology and grain size are fine-tuned, and bulk defect concentration and mitigated interface carrier recombination are well suppressed.
  • The research is supported by the National Natural Science Foundation of China (NSFC), Key Research and Development Project of Henan Province, Zhongyuan Thousand Talents (Zhongyuan Scholars) Program of Henan Province, Natural Science Foundation of Henan Province, Academic Degrees & Graduate Education Reform Project of Henan Province, Key Scientific Research Projects of Henan Province Higher Education Institutions, Technology Research and Development Program of Henan province.
  • The team's finding has the potential to revolutionize the field of solar energy and contribute to the development of more efficient and sustainable energy solutions.

Statistics:

  • The power conversion efficiency of the optimized device increases from 0.77% to 2.57% (a 236% increase).
  • The highest power conversion efficiency reported among Ag2S solar cells without an electron transport layer is 2.57%.
  • The research is supported by multiple financial agencies, including the National Natural Science Foundation of China (NSFC) and the Natural Science Foundation of Henan Province.
  • The team's discovery has the potential to contribute to the development of more efficient and sustainable energy solutions.

Sources:

  • NewsRx. Researchers at Xuchang University Target Solvent Engineering (Solvent Engineering for High-performance Silver Sulfide Thin Film Solar Cells). Journal of Engineering. October 20, 2025; p 3948.
  • Solvent Engineering for High-performance Silver Sulfide Thin Film Solar Cells. Nano Research, 2025;18(10).