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All‐inorganic lead‐free Cs2AgBiBr6 double perovskite solar cells (PSCs) have attracted growing attention owing to their eco‐friendly features and robust intrinsic stability. However, arising from the rapid crystal growth, the poor film quality always leads to substantial non‐radiative recombination and inferior performance improvement. Herein, high‐efficiency and stable Cs2AgBiBr6 PSCs are obtained by introducing a functional polymethyl methacrylate (PMMA) layer at the perovskite surface to avoid direct contact between carbon and the underlying charge transfer layer, as well as to passivate the defects. When assembling into solar cells, the non‐radiative charge recombination is suppressed and the interfacial charge extraction is accelerated. As a result, the carbon‐electrode‐based Cs2AgBiBr6 PSC yields an enhanced efficiency of 2.25% with a high open‐circuit voltage of 1.18 V. Moreover, the unencapsulated device exhibits superior long‐term stability owing to the protection of the PMMA layer from corrosion by the extraneous water and oxygen, retaining nearly 100% of the initial efficiency after storage in 25 °C, with 5% relative humidity (RH) for 80 days and high temperature of 85 °C, and 0% RH for 60 days, respectively. A simple method of polymer passivation for enhancing the performance and stability of Pb‐free Cs2AgBiBr6 PSCs is provided.

The colloidal nature of perovskite precursor solution highly determines the quality of perovskite film and the photovoltaic performance of a perovskite solar cell (PSC). Herein, we demonstrate a facile method to fabricate a highquality all-inorganic CsPbIBr 2 film by regulating the temperature of the precursor solution. After characterization, stable microcrystals with a size up to 1 μm have been formed under high temperatures, more suitable for preferable crystallization by spontaneous nucleation than the precursor solution at room temperature. Consequently, rapid charge transfer across enlarged crystal grain rather than intragranular charge recombination is achieved within the perovskite film because of reduced defects, promoting the efficiency as high as 11.12% for carbon-based PSC, which is higher than that of a control device with 8.51% efficiency. Moreover, the optimal device shows improved stability under air atmosphere and high-temperature conditions.

Organic–inorganic hybrid perovskite solar cells (PSCs) have achieved an impressive certified efficiency of 25.7%, which is comparatively higher than that of commercial silicon solar cells (23.3%), showing great potential toward commercialization. However, the low stability and high toxicity due to the presence of volatile organic components and toxic metal lead in the perovskites pose significant challenges. To obtain robust and low‐toxicity PSCs, substituting organic cations with pure inorganic cations, and partially or fully replacing the toxic Pb with environmentally benign metals, is one of the promising methods. To date, continuous efforts have been made toward the construction of highly performed low‐toxicity inorganic PSCs with astonishing breakthroughs. This review article provides an overview of recent progress in inorganic PSCs in terms of lead‐reduced and lead‐free compositions. The physical properties of poor‐lead all‐inorganic perovskites are discussed to unveil the major challenges in this field. Then, it reports notable achievements for the experimental studies to date to figure out feasible methods for efficient and stable poor‐lead all‐inorganic PSCs. Finally, a discussion of the challenges and prospects for poor‐lead all‐inorganic PSCs in the future is presented.