Hole‐conductor–free carbon‐based perovskite solar cells (C‐PSCs) are a promising candidate for commercialization due to low cost, simple, and industry applicable fabrication methods. However, when measuring the photovoltaic parameters of these cells, they do not achieve their maximal performance immediately following their fabrication, but rather require a certain maturation period. Herein, the natural and induced changes that occur in C‐PSCs are studied after their fabrication is complete. It is observed that the current density increases by natural maturation, and the open‐circuit voltage increases by light‐soaking treatment. Using charge extraction, intensity‐modulated photovoltage spectroscopy, and voltage decay measurements during the three steps of maturation, it is possible to observe some changes in crystallization and surface traps, which are the cause for the evolution in the photovoltaic parameters. Moreover, in the case of two‐step deposition, the cells achieve their final performance already as fresh cells in contrast to the case of one‐step deposition cells. The conclusions offer practical information regarding the preparation and optimal measurement conditions of C‐PSCs as well as possible prospects for the improvement and optimization of this cell type.

Perovskite solar cells have developed into a promising branch of renewable energy. A combination of feasible manufacturing and renewable modules can offer an attractive advancement to this field. Herein, a screen-printed three-layered all-nanoparticle network was developed as a rigid framework for a perovskite active layer. This matrix enables perovskite to percolate and form a complementary photoactive network. Two porous conductive oxide layers, separated by a porous insulator, serve as a chemically stable substrate for the cells. Cells prepared using this scaffold structure demonstrated a power conversion efficiency of 11.08% with a high open-circuit voltage of 0.988 V. Being fully oxidized, the scaffold demonstrated a striking thermal and chemical stability, allowing for the removal of the perovskite while keeping the substrate intact. The application of a new perovskite in lieu of a degraded one exhibited a full regeneration of all photovoltaic performances. Exclusive recycling of the photoactive materials from solar cells paves a path for more sustainable green energy production in the future.

Lead halide perovskites attract much attention in recent years as a realistic solution for efficient and low‐cost solar cells. One of the interesting solar cell structures is the fully mesoporous‐carbon‐based perovskite solar cells. The mesoporous layers can be fabricated entirely by screen printing with the potential for upscaling. Herein, the two‐step deposition of perovskite in mesoporous‐carbon‐based perovskite solar cells is studied. The influence of the dipping time on the photovoltaic parameters is investigated using charge extraction and intensity‐modulated photovoltage spectroscopy (IMVS) measurements. A power conversion efficiency of 15% is observed for cells fabricated using two‐step deposition which is one of the highest reported for this solar cell structure. Stability characterizations at maximum power point (MPP) tracking show degradation with time, however a complete recovery of the devices in the dark is revealed. Analyzing the mechanism for this shows that the perovskite's unit cell shrinks during the recovery process due to internal stress relief. This interesting phenomenon opens the possibility to optimize the stability of these solar cells for commercial applications.