A strategy for efficient parallel tandem dye-sensitized solar cells based on doubled-sided Pt electrode with a novel phenothiazine-based dye and N719

Abstract

The tandem idea of the dye-sensitized solar cells (DSSCs) is considered as a promising route to break through the barrier for the development of the DSSCs through extending the absorption spectra and improving the short-circuit photocurrent density (Jsc) or open-circuit voltage (Voc). In this paper, an innovative 2-phenothiazine-phenylamine-based organic dye PTZ-17 with complementary optical properties to dye N719 was exploited. The parallel tandem dye-sensitized solar cells (PT-DSSCs) with a doubled-sided Pt electrode which are composed of a N719-based top cell and a PTZ-17-based bottom cell were manufactured and exhibited a high photoelectric conversion efficiency of 10.52%. From our work, a new strategy is provided for the further exploration of the dye molecular selection and the high-efficient DSSCs preparation.