The article "Recent Advances of Spectrally Selective Absorbers: Materials, Nanostructures, and Photothermal Power Generation" by Zhuo-Hao Zhou, Cheng-Yu He, and Xiang-Hu Gao reviews the latest advancements in spectrally selective absorbers (SSAs) used in photothermal technologies, particularly in concentrated solar power (CSP) systems and solar thermoelectric generators (STEGs). The authors highlight the critical role of SSAs in maximizing solar energy absorption while minimizing infrared thermal loss, which is essential for enhancing solar utilization efficiency. They discuss the challenges posed by high temperatures in CSP systems, which require both excellent optical properties and thermal stability in SSAs. The review covers various advanced materials and nanostructures that have been developed to improve SSA performance, including ceramic composites, MXenes, high-entropy materials, and graphene. These materials offer enhanced light-trapping abilities and thermal stability, making them promising candidates for next-generation SSAs. The authors also explore the integration of these materials with established nanostructures, such as optical microcavity multilayer structures and dual-ceramic structures, to achieve superior performance. The article further discusses the fabrication methods for SSAs, including magnetron sputtering and the sol-gel method, and evaluates the performance of different SSA designs through metrics such as solar absorptivity, thermal emissivity, photothermal conversion efficiency, and lifetime. The authors conclude by summarizing the challenges and opportunities in the field of high-temperature SSAs, emphasizing the potential of emerging materials and nanostructures to revolutionize solar-thermal power generation systems.The article "Recent Advances of Spectrally Selective Absorbers: Materials, Nanostructures, and Photothermal Power Generation" by Zhuo-Hao Zhou, Cheng-Yu He, and Xiang-Hu Gao reviews the latest advancements in spectrally selective absorbers (SSAs) used in photothermal technologies, particularly in concentrated solar power (CSP) systems and solar thermoelectric generators (STEGs). The authors highlight the critical role of SSAs in maximizing solar energy absorption while minimizing infrared thermal loss, which is essential for enhancing solar utilization efficiency. They discuss the challenges posed by high temperatures in CSP systems, which require both excellent optical properties and thermal stability in SSAs. The review covers various advanced materials and nanostructures that have been developed to improve SSA performance, including ceramic composites, MXenes, high-entropy materials, and graphene. These materials offer enhanced light-trapping abilities and thermal stability, making them promising candidates for next-generation SSAs. The authors also explore the integration of these materials with established nanostructures, such as optical microcavity multilayer structures and dual-ceramic structures, to achieve superior performance. The article further discusses the fabrication methods for SSAs, including magnetron sputtering and the sol-gel method, and evaluates the performance of different SSA designs through metrics such as solar absorptivity, thermal emissivity, photothermal conversion efficiency, and lifetime. The authors conclude by summarizing the challenges and opportunities in the field of high-temperature SSAs, emphasizing the potential of emerging materials and nanostructures to revolutionize solar-thermal power generation systems.