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To enhance their overall performance and mitigate key limitations associated with each approach, we present hybrid electro\u2010thermochromic (ETC) smart windows. By integrating a black electrochromic layer composed of three complementarily\u2010colored, redox\u2010matched viologen molecules with a paraffin\u2010particle\u2010based thermochromic film, these hybrid devices deliver multiple synergistic functionalities: voltage\u2010controlled, multimodal operation enabling both passive and active solar modulation; photothermal\u2010assisted activation of the thermochromic layer driven by the strong solar absorption of the colored electrochromic state; efficient regulation of solar heat gain with a ten\u2010fold reduction in electrical energy consumption for the electrochromic component; and near\u2010complete suppression of sunlight transmission by simultaneous activation of both layers thanks to their complementary spectral responses. In energy\u2010saving experiments in hot days, ETC windows achieved a maximum reduction of 8.5\u00b0C in solar heat gain relative to clear glass, in agreement with building\u2010energy simulations predicting up to a 23% decrease in annual energy usage in low\u2010latitude regions (e.g., Honolulu). Collectively, these results demonstrate the practical energy\u2010saving potential of ETC smart windows, which offer a versatile and energy\u2010efficient solution for dynamic solar control across diverse climatic conditions.<\/jats:p>","DOI":"10.1002\/advs.77765","type":"journal-article","created":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T08:55:12Z","timestamp":1790153712000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Synergistic Effects in Multistate Black Electro\u2010Thermochromic Smart Windows for Energy\u2010Efficient Modulation of Solar Heating"],"prefix":"10.1002","author":[{"given":"Xilu","family":"Wu","sequence":"first","affiliation":[{"name":"State Key Laboratory of Advanced Fiber Materials College of Materials Science and Engineering Donghua University  Shanghai 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