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Highlights d We investigate the importance of culture in achieving the Sustainable Development Goals (SDGs) d Culture mediates the attainment of 17 SDGs, represented by 79% of the SDG targets d Cultural values explain as much as 26% of the variations in the achievement of the SDGs d Sustainable policies can be tailored to, but not captive to, cultural context

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Ferro‐pyro‐phototronic (FPP) effect is a triple coupling of ferroelectricity, light‐induced pyroelectricity, and photo‐excitation, which holds a bright promise for next‐generation modern optoelectronic devices. However, except for few oxides (e.g., BaTiO3), new FPP‐active candidates remain extremely scarce due to the knowledge lacking on the underlying role of three coupling components. By tailoring the interlayered spacers, the authors present a series of 2D cesium‐based perovskite ferroelectrics, (A′)2CsPb2Br7 (where A′‐site cation is organic spacer), showing remarkable FPP‐active properties. As expected, the dynamic ordering and reorientation of spacers along with atomic displacement of Cs+ in the perovskite cavity lead to their ferroelectric polarizations. Particularly, exceptional FPP properties are created through this cooperation; the most FPP‐active candidate (n‐hexylammonium)2CsPb2Br7 endows a giant contrast up to 1500% for photopyroelectric current to photovoltaic signal. This figure‐of‐merit is far beyond most inorganic oxide counterparts, such as ≈110% for BaTiO3. Further, the electric switching and controlling of FPP directions confirm a crucial role of ferroelectric polarization to this coupling effect. To the authors’ best knowledge, this is the first study on an FPP‐active candidate of 2D hybrid perovskites, which affords a new avenue to design ferroelectrics with targeted physical properties and forward their potentials to smart optoelectronic device application.

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Organic–inorganic metal halide perovskites (most notably CH3NH3PbI3) have demonstrated remarkable physical attributes for photovoltaic and diverse optoelectronic applications, whereas concerns about toxicity owing to the use of lead in the chemical composition still motivate further exploration of new, nontoxic candidates. Lead‐free halide double perovskites (HDPs), designed by the rational chemical substitution of Pb2+ with other nontoxic candidate elements, have recently attracted interest as a fascinating alternative to their Pb‐based counterparts. Herein, recent advances in crystal structures, physical properties, and versatile optoelectronic applications of lead‐free HDPs, such as solar cells, photodetectors, X‐ray detectors, and light‐emitting diodes, are reviewed. Perspectives to improve the physical and photoelectric properties of existing HDP materials are also discussed and will favor future development of new, lead‐free HDP candidates.