By:
On:
In: Energymaterials

An international team of scientists  has greatly improved the stability of organic-inorganic lead halide perovskites. These materials have enormous potential for photovoltaic applications, but still suffer from relatively short device lifetimes. Guanidinium replaces some traditional cations The scientists, led by researchers from the EPFL in Lausanne, Switzerland, incorporated a large organic cation – guanidinium – into the perovskite crystal structure, partly replacing the methylammonium and formamidinium cations used traditionally. Conversion efficiency 19 % Overall, the new material delivered average power conversion efficiencies of over 19%, and increased  operation to 1,000 h under continuous illumination. This is an important step for research in the perovskite field. ScientistsRead More →

By:
On:
In: Summerstudents

Organic-inorganic hybrid metal-halide perovskites are very interesting materials and can be used as an absorber in photovoltaic device. Efficiencies of solar cells based on metal halide perovskites above 20% have been reported, however, the long-term stability of related solar cells is still challenging. The robustness of triple cation perovskite films seems to indicate the way to obtain a long-term stability. The samples used on the experiments consisted on a substrate with a layer of porphyrin. Their characterization by surface photovoltage (SPV) technique was performed by analyzing its transport length in interaction with the perovskite. The procedure included the measurements before and after the perovskite layerRead More →