A loss mechanism for solar cells is the incomplete absorption of sunlight. Light trapping aims to remove this loss by both reducing reflection at the front surface of the cell and engineering the light inside the cell so that it cannot escape, thus effectively trapping the light. Light which is trapped will be absorbed by the cell, thereby increasing the cell performance.
With this goal in mind, novel devices are developed using nanoimprint lithography to precisely control the geometry while maintaining excellent scalability. These concepts are then directly applied to liquid phase crystallized thin-film silicon solar cells where light trapping is particularly effective due to the low device thickness.