Nattestad, A., Cheng, Y. Y., MacQueen, R. W., Wallace, G. G., Schmidt, T. W. Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light. J. Vis. Exp. (91), e52028, doi:10.3791/52028 (2014).