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Metal halide perovskite with high Young's modulus is prone to form cracks when subjected to mechanical stresses such as bending, twisting, or impacting, ultimately leading to a permanent decline in the performance of their photovoltaic devices. These mechanical properties pose challenges to the durability of long‐term service of photovoltaic devices and the production of flexible devices. To address this issue, the poly (lipoic acid‐co‐Styrene) elastomer is employed to modulate the modulus of perovskite films. The peak force quantitative nanomechanical atomic force microscopy measurements and nanoindentation tests demonstrated a reduction in modulus, with the lower modulus preventing the formation of cracks and defects during deformation. Moreover, this approach also suppressed the non‐radiative recombination of perovskite solar cells by leveraging the interaction between functional groups and defects. Through this method, the rigid inverted devices attained a power conversion efficiency of 24.42% alongside remarkable stability. Concurrently, flexible inverted devices achieved a power conversion efficiency of 22.21%. This strategy offers a promising avenue for fabricating flexible perovskite solar cells and enhancing their mechanical durability. [ABSTRACT FROM AUTHOR]

The meticulous control of crystal facets in polycrystalline perovskite films offers valuable insights into the photoelectric properties, varying significantly with different orientations. Exploring effective means to regulate these facets is crucial, and further revealing the underlying mechanisms is needed. Here, the research employed green solution bathing to obtain high‐quality perovskite films with preferred crystallographic orientation. In brief, eco‐friendly 2‐pentanol is used as the solvent, and functional molecules 2‐(dimethylaminomethyl)‐4‐(2‐aminoethylthiomethyl)thiazole (DAT) are introduced into the solution bathing as the solute. By introducing DAT molecules, precise control over perovskite crystal nucleation kinetics is achieved, resulting in films with a preferential (100) facet orientation. Conversely, films without DAT exhibited distinct (111) facet orientation. The regulation of DAT on perovskite film crystal facet is verified through theoretical and crystallographic analyses. Theoretical calculations show that S atom of DAT binds most strongly to the (100) facet of FAPbI3, promoting surface energy reduction and thermodynamic enhancement, favoring (100) crystal orientation. Crystallographic characterization further proved the regulation effect. In addition, PL/TRPL tests confirm the regulation of DAT on superior photoelectric properties of (100)‐oriented perovskite films. The work introduces a novel approach and preparation process for regulating the crystal facets orientation of polycrystalline perovskite films. [ABSTRACT FROM AUTHOR]

Space solar cells, have been providing a consistent supply of energy for various spacecraft for decades. Currently, the third‐generation solar cells, such as perovskite solar cells (PSCs) and organic solar cells, have demonstrated significant potential for space applications. However, their real performance in space environments is not yet clear. To assess crucial performance parameters, solar cells need to be calibrated under the standard space spectral irradiance before deployment in space. This is known as AM0 calibration. This review article focuses on the calibration techniques and methods for space solar cells. The topics covered include space environment and standard testing condition for solar cells, the measurements of key parameters for traditional solar cells, advancements in PSCs and organic solar cells for space applications, and a comprehensive review of diverse calibration methods. The discussion spans from near‐ground calibration to near‐space calibration and space calibration, encompassing approaches, key technologies, developmental milestones, and the respective merits of each calibration methods, especially focus on high altitude balloon calibration. Finally, the article addresses the challenges and future trends of space solar cell calibration based on the aforementioned discussions. [ABSTRACT FROM AUTHOR]

Perovskite solar cells as one of the most promising photovoltaic technologies for commercialization have attracted tremendous attention in recent years. It is of great significance to develop and obtain a new controllable technology for preparing large‐area high‐quality perovskite thin films for promoting industrialization. The key to realizing high‐performance large‐area perovskite photovoltaic devices lies in the controllable preparation of large‐area perovskite active layers. Solvent bathing and solution bathing methods are new technologies suitable for large‐scale production, which can realize the controllability of large‐area and high‐quality perovskite layers and have the scalability, simplicity, and applicability required by industrialization. Herein, the research progress of large‐area metal halide perovskite films prepared by solvent bathing and solution bathing is emphasized. The crystallization kinetics of perovskite films prepared by solvent bathing is first introduced, including the types of antisolvents and the basis for screening. The next section illustrates the crystallization kinetics of solution bathing. Third, large‐area perovskite devices based on solvent bathing and solution bathing are present. Finally, the advantages and problems of this technology are summarized and future application scenarios are studied. [ABSTRACT FROM AUTHOR]

Among all‐inorganic perovskite photoactive materials, CsPbIBr2 demonstrates the most balanced trade‐off between optical bandgap and phase stability. However, the poor quality and high‐temperature engineering of CsPbIBr2 film hinder the further optimization of derived perovskite solar cells (PSCs). Herein, a simple dynamic vacuum‐assisted low‐temperature engineering (merely 140 °C) is proposed to prepare high‐quality CsPbIBr2 film (VALT‐CsPbIBr2 film). Compared to HT‐CsPbIBr2 film processed via conventionally high temperature (280 °C), VALT‐CsPbIBr2 film presents higher crystallinity and more full coverage consisting of larger grains and fewer grain boundaries, which results in intensified light‐harvesting capability, reduced defects, and extended charge carrier lifetime. Benefiting from those improved merits, VALT‐CsPbIBr2 PSCs show lower trap‐state densities, more proficient charge dynamics, and larger built‐in potential than HT‐CsPbIBr2 PSCs. Consequently, VALT‐CsPbIBr2 PSCs deliver a higher efficiency of 11.01% accompanied by a large open‐circuit voltage of 1.289 V and a remarkable fill factor of 75.31%, being highly impressive among those reported CsPbIBr2 PSCs. By contrast, the efficiency of HT‐CsPbIBr2 PSCs is only 9.00%. Moreover, VALT‐CsPbIBr2 PSCs present stronger endurance against heat and moisture than HT‐CsPbIBr2 PSCs. Herein, a feasible avenue to fabricate efficient yet stable all‐inorganic PSCs via low‐temperature engineering is provided. [ABSTRACT FROM AUTHOR]

Planar‐heterojunction perovskite solar cells (PSCs) have experienced rapid evolution in recent years because of the low‐temperature processing, suitable alignment, and high mobility of the tin oxide buried contact layer. However, improper SnO2 surface states and poor crystallinity of the top perovskite films are still the main obstacles for the planar PSCs in which performance always lags behind their mesoporous counterparts. Herein, a new buried contact is reported by introducing graphitic carbon nitride (g‐C3N4) into the commonly used SnO2 which performs outstanding transmittance, conductivity, and surface states for a high‐quality electron‐transporting layer. Moreover, the vertical composition and crystallinity of the top perovskite film are manipulated by rich amino groups on the edge of the g‐C3N4 nanosheets which induce the prenucleation of the lead‐rich species at the buried interface. Benefiting from the high‐quality buried contacts and the optimized perovskite layers, the resultant PSCs achieve a champion efficiency of 21.5% with all photovoltaic parameters enhanced in comparison with their control counterparts (<20%). [ABSTRACT FROM AUTHOR]

Wide‐bandgap (WBG) perovskite solar cells (PSC) have been widely applied in tandem photovoltaics (PV) for various scenarios including indoor, building, and underwater PV. However, the current mainstream WBG PSCs are fabricated by spin‐coating, which is inappropriate for scalable production. Blade‐coating has demonstrated great potential to realize commercial PV panel size at low cost, while till present, only a few efforts have been devoted to blade‐coated WBG PSCs, significantly hampering their efficiency evolvements. Herein, state‐of‐the‐art research progress and major challenges of blade‐coated WBG PSCs are reviewed, with their optimization strategies being summarized into four main categories, such as blading parameter, solvent engineering, additive/dopant, and defect passivation. Film homogenization, defect manipulation, optimized blade coating machines, single‐halide three‐dimensional WBG perovskites, and fabrication on the textured substrate are proposed as five promising directions for future investigations on high‐performance blade‐coated WBG PSCs. [ABSTRACT FROM AUTHOR]