Researchers from the Korea Advanced Institute of Science and Technology (KAIST) and Sungkyunkwan University have developed a perovskite-based semi-transparent solar cell that is reportedly highly efficient and functions very effectively as a thermal mirror.
A major key to achieving semitransparent solar cells is to develop a transparent electrode for the cell's uppermost layer that is compatible with the photoactive material. The Korean team developed a 'top transparent electrode' (TTE) that works well with perovskite solar cells. The TTE is based on a multilayer stack consisting of a metal film sandwiched between a high refractive index layer and an interfacial buffer layer. This TTE, placed as a solar cell's top-most layer, can be prepared without damaging ingredients used in the development of perovskite solar cells. Unlike conventional transparent electrodes that only transmit visible light, the team's TTE both allows visible light to pass through and reflects infrared rays.