20:T4eb,The environmental toxicity of Pb in organic-inorganic hybrid perovskite solar cells remains an issue, which has triggered intense research on seeking alternative Pb-free perovskites for solar applications. Halide perovskites based on group-VA cations of Bi³⁺ and Sb³⁺ with the same lone-pair ns² state as Pb²⁺ are promising candidates. Herein, through a joint experimental and theoretical study, we demonstrate that Cl-incorporated methylammonium Sb halide perovskites (CH₃NH₃)₃Sb₂Cl_XI_9-X show promise as efficient solar absorbers for Pb-free perovskite solar cells. Inclusion of methylammonium chloride into the precursor solutions suppresses the formation of the undesired zero-dimensional dimer phase and leads to the successful synthesis of high-quality perovskite films composed of the two-dimensional layered phase favored for photovoltaics. Solar cells based on the as-obtained (CH₃NH₃)₃Sb₂Cl_XI_9-X films reach a record-high power conversion efficiency over 2%. This finding offers a new perspective for the development of nontoxic and low-cost Sb-based perovskite solar cells.21:T484,Abstract Wearable sensors have drawn considerable interest for healthcare applications due to their low cost, flexibility, lightweight, and biocompatibility. Gold nanomaterials possess excellent properties such as high conductivity/flexibility, facile surface functionalization, biocompatibility, wide electrochemical sensing window, and extraordinary optical response, making them excellent candidates for wearable sensors. By implementing gold nanomaterials such as gold nanoparticles (AuNPs) and gold nanowires (AuNWs), great efforts are devoted to fabricate wearable sensors with rational designs for healthcare applications. This review focuses on recent advances in gold nanomaterials‐implemented wearable sensors, particularly the fabrication method, the working mechanism, and the performance of these wearable sensors in healthcare‐related applications. Wearable sensors including strain/pressure sensors, humidity/gas sensors, electrochemical sensors, and colorimetric sensors are discussed and highlighted. Meanwhile, future prospects and challenges are also discussed on the development of gold nanomaterials‐implemented wearable sensors.

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