If solar energy is to become available to more people, smart material choices need to be made. The research group in the Photovoltaic Materials Laboratory is studying solar cells made from materials which are cheaper and more readily available than those used for today’s solar cells.
Solar cells technology in our lab is based on unique monograin layer solar cell design. This technology is being implemented by Spin-off Company of TTÜ, crystalsol GmbH. The monograin layer technology (MGL) combines the high photoelectrical parameters of single crystals and advantages of polycrystalline materials and technologies: low cost and simple technology of materials and devices, the possibility to make flexible devices and to use the materials up to 100%. MGL technology allows to separate the materials formation from the module fabrication. Large area modules are fabricated at room temperature in a continuous roll-to-roll process. Homogeneous composition of powders gives an additional advantage and leads to homogeneous modules without any up-scaling problem. This technology can be used for different absorber materials.
In addition to powder technology, several thin film technologies such as pulsed laser deposition (PLD), co-evaporation, electrodeposition and magnetron sputtering are applied for the growth of different thin film materials for photovoltaic applications.