Graphene‐Based Inverted Planar Perovskite Solar Cells: Advancements, Fundamental Challenges, and Prospects

Metal halide based perovskite solar cells (PSCs) are considered among the most promising photovoltaic technologies, and already present certified efficiencies that surpass 22 %. The high performance and low fabrication cost make this technology competitive with that of state‐of‐the‐art thin‐film photovoltaics. However, PSCs present some striking disadvantages that hinder their commercialization, including short operational lifetimes, high toxicity, and hysteresis effects, which lower both the performance and long‐term stability of the devices. Herein, work conducted within the last two years is summarized with regard to addressing the challenges of low‐temperature‐processed planar inverted PSCs composed of graphene‐based materials. In addition, critical challenges and the prospects of this field are discussed and some prospects for future research directions are proposed. Turning previous work on its head: Metal halide based perovskite solar cells (PSCs) are considered among the most promising photovoltaic technologies (see figure). The high performance and low fabrication cost make this technology competitive with that of state‐of‐the‐art thin‐film photovoltaics, but there are still challenges to overcome. Progress within the last two years in the field of graphene‐based inverted planar PSCs is summarized.