The practical application of DSSCs requires further improvements in the power conversion efficiency and long term stability. Recently, we have systematically studied a novel concept of D−A−π−A model for the molecular engineering of organic photosensitizers. We highlights recent advance in the D−A−π−A based photosensitizers, specifically focusing on the mechanism of efficiency and stability enhancements. Also we take insight into the additional acceptor as well as the trade-off of long wavelength response. The basic principles are involved in the molecular engineering of efficient D−A−π−A sensitizers, providing a clear road map how to rationally extend the response wavelength, enhance molecular extinction coefficients, and step by step optimize photovoltaic efficiency.

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