Dye sensitized solar cells with 13% efficiency achieved through the molecular engineering of porphyrin sensitizers.
Dye sensitized solar cells have gained widespread attention in recent years because of their low production costs, ease of fabrication and tunable optical properties, such as colour and transparency. Here, we report a molecularly engineered porphyrin dye, coded SM315, which features the prototypical structure of a donor p bridge acceptor and both maximizes electrolyte compatibility and improves light harvesting properties. Linear response, time dependent density functional theory was used to investigate the perturbations in the electronic structure that lead to improved light harvesting. Using SM315 with the cobalt(II/III) redox shuttle resulted in dye sensitized solar cells that exhibit a high open circuit voltage VOC of 0.91 V, short circuit current density JSC of 18.1 mA cm( 2) fill factor of 0.78 and a power conversion efficiency of 13%
Nature chemistry