HarvSolar: Eco-friendly Perovskite Photovoltaics


Eco-friendly, non-toxic, lead-free, tin-based perovskite solar cells show an enhancement of 30% in power conversion efficiency and maintain stable performance (>95%) after continuous working for 1000 hours.

  • HarvSolar: Eco-friendly Perovskite Photovoltaics 0
  • HarvSolar: Eco-friendly Perovskite Photovoltaics 1
Research completion
Commercialisation opportunities
Technology licensing agreement
Problem addressed

Organic-inorganic lead halide perovskites have made tremendous development owing to their remarkable optoelectronic properties, low-cost solution processing, and the exceptional efficiency approaching 26%. However, the perceived toxicity of lead element in the state-of-the-art perovskite solar cells remains an issue that must be addressed on the path towards commercialization.

  • We designed and synthesized new lead-free tin perovskite materials with excellent optoelectronic properties and stability.
  • We developed and optimized thin film deposition processes based on these synthesized lead-free perovskite materials
  • The innovation develops environmentally friendly tin perovskite solar cells and a preparation method to solve the toxicity problem of widely applied perovskite solar cells.
Key impact
  • No heavy metal harmful substances and environmentally friendly
  • Low cost
  • Lightweight
  • High efficiency
  • 48th International Exhibition of Inventions Geneva (IEIG) - Gold Medal
  • Greenhouse power generation
  • Self-powered IoT nodes
  • Flexible wearable photovoltaic


  • PWG/PA/1264/5/2022 (US) Patent number: 17/991,165 (USA)
City University of Hong Kong (CityU)

As one of the fastest growing universities in the world over the past decade, City University of Hong Kong (CityU) is recognised as a hub for innovation in research and professional education. CityU identifies solutions to critical global challenges by extending the frontiers of knowledge both within and beyond existing research paradigms.

The University’s highly qualified academics are drawn from all over the world, not only bringing a wealth of research and professional experience to the teaching programmes, but also contributing to the knowledge and technology advancement.