Solar cells, with conversion of abundant and clean solar energy into electricity, have emerged as a prominent technology in the race to reduce our dependence on fossil fuels and combat climate change. Among the various photovoltaic technologies, dye-sensitized solar cells (DSCs) have garnered significant attention due to their cost-effectiveness, ease of fabrication, and tunable optical properties. With the development of traditional n-type DSCs (n-DSCs) and p-type DSCs (p-DSCs) based on liquid electrolytes, the concept of p-n tandem DSCs has been proposed to improve cell efficiencies and also realized based on sharing a redox couple in liquid electrolytes. However, the liquid p-n tandem DSCs (t-DSCs) has been challenged by leakage of electrolyte and stability issues. Moreover, the theoretical photovoltage (cumulative in a series design) of the liquid p-n tandem DSC is also limited by the energy difference between the conduction band (CB) of n-type semiconductor, such as TiO2, used in n-DSCs and the valence band (VB) of p-type semiconductor, such as NiO, used in p-DSCs, typically ca. 1 V (Figure ). To overcome these hurdles, we previously proposed the concept and design principle of p-n tandem solid-state dye-sensitized solar cells (t-ssDSCs) in which a hole transport material (HTM) and electron transport material (ETM) are used to replace the liquid electrolyte to extract holes and electrons from dye-sensitized photoanode and dye-sensitized photocathode, respectively. If both photoelectrodes are then connected by a transparent conductor, it has been proposed that the photovoltage of p-n t-ssDSCs should be able to overcome the photovoltage limit in liquid p-n t-DSCs since the two half cells do not need to share the same redox couple, possibly reaching up to 2 V with suitable materials and device optimization (Figure ). However, until now, the concept has not been realized to show that such a device really could surpass the limitations of liquid t-DSCs.