FSU chemistry professor uses old materials to make newer, better solar cells
A 糖心vlog research team is mixing the old with the new to create a more stable solar cell.
Professor of Chemistry Biwu Ma and his team published a new study that shows if you add a layer of ancient organic pigment to a perovskite solar cell, it increases the stability and efficiency of the cell.
The study is published in the journal .
鈥淧igments are abundant, low cost and robust,鈥 Ma said. 鈥淲hen we combine them with perovskites, we can generate new high-performance hybrid systems. It鈥檚 using the old with the new, and together they produce something really exciting.鈥
Ma鈥檚 research in new generation solar cell technologies has been focusing on addressing the stability issues and challenges of perovskite solar cells. A perovskite solar cell is a type of photovoltaic cell which includes a perovskite- structured compound, most commonly an organic-inorganic lead or tin halide-based hybrid material, as the light-harvesting layer.
Over the past decade, research on perovskite solar cells has exploded. When they were first reported in 2009, the power conversion efficiency registered at about 4%, which is now as high as 25%. However, there are drawbacks for commercial viability, such as the material鈥檚 tendency to degrade quickly.
Researchers worldwide have been searching for that perfect formula to make them both stable and highly efficient.
The solar cell Ma鈥檚 team used for the experiment 鈥 based on methylammonium lead iodide 鈥 had an efficiency of 18.9% without the layer of pigment. With it, that number rose to 21.1%. The team also found that with the addition of the pigment layer, the cell without encapsulation could retain 90% of its initial efficiency after 1,000 hours in ambient conditions.
Adding the layer of insoluble pigment via facile solution processing and thermal annealing also makes the cell hydrophobic, meaning water cannot stay on the surface.
鈥淲e believe that surface passivation of these cells using low-cost pigments is a very promising approach to improving their stability and efficiency,鈥 Ma said.
Ma鈥檚 co-authors are postdoctoral researcher Quingquan He; doctoral students Michael Worku, He Liu, Alex Robb and Sandrine Lteif; research specialists Eric Lochner and J.S. Raaj Vellore Winfred,; FSU chemistry professors Joseph Schlenoff and Kenneth Hanson; and Professor Bumjoon Kim from the Korea Advanced Institute of Science and Technology.
The work is primarily supported by the Air Force Office of Scientific Research. Additional support was provided by the National Science Foundation, the FSU Office of Research, the U.S. Department of Energy and the Korea National Research Foundation.