It looks like they don't claim to break the second law of thermodynamics, but the press article is so bad that any interpretation is possible. IIUC in the research article they just got "quantum efficiency" of 130% i.e. 1.3 electrons per 1 photon. This may improve the energetic efficiency, but I can't be sure from the details. It loos like a weird setup disolved in a liquid, so I guess it's still less efficient than a usual photovoltaic cell.