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<p>Flexible solar-thermoelectric generators hold great promise for efficient solar energy harvesting and power supply in wearable electronics. However, the achievement of strong photothermal and thermoelectric performance simultaneously within a single material remains a significant challenge. Here, we propose a fully integrated solar-thermoelectric generator that directly employs Ag<sub>2</sub>Se thermoelectric thin films as the light-absorbing terminal, combined with a bottom infrared-reflective layer and surface visible anti-reflective coating. This multilayer architecture enables solar-selective absorption and enhances the photothermal conversion efficiency of Ag<sub>2</sub>Se up to 87.6%, while demonstrating good generalizability to other narrow-bandgap thermoelectric films. The resulting ring-shaped flexible generator delivers a maximum temperature difference and power density of 19.6 K and 0.17 μW cm<sup>-2</sup> under 1-sun irradiation and exhibits a stable peak output power of ~1 μW under prolonged outdoor sunlight. These results highlight an effective strategy for high-efficiency solar-thermoelectric generators design and broaden the application potential of narrow-bandgap thermoelectric thin films in photothermal energy conversion.</p>

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An all-in-one Ag2Se-based flexible solar-thermoelectric generator with photothermal integration

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月2日

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  • Shuaihang Hou,
  • Jian Wang,
  • Guixia Zhang,
  • Xinqi Liu,
  • Zuoxu Wu,
  • Bingshang Liu,
  • Mengyang Lu,
  • Muhao Zhang,
  • Shihao Qiu,
  • Zhiliang Li,
  • Feng Cao,
  • Qian Zhang,
  • Shufang Wang

摘要

Flexible solar-thermoelectric generators hold great promise for efficient solar energy harvesting and power supply in wearable electronics. However, the achievement of strong photothermal and thermoelectric performance simultaneously within a single material remains a significant challenge. Here, we propose a fully integrated solar-thermoelectric generator that directly employs Ag2Se thermoelectric thin films as the light-absorbing terminal, combined with a bottom infrared-reflective layer and surface visible anti-reflective coating. This multilayer architecture enables solar-selective absorption and enhances the photothermal conversion efficiency of Ag2Se up to 87.6%, while demonstrating good generalizability to other narrow-bandgap thermoelectric films. The resulting ring-shaped flexible generator delivers a maximum temperature difference and power density of 19.6 K and 0.17 μW cm-2 under 1-sun irradiation and exhibits a stable peak output power of ~1 μW under prolonged outdoor sunlight. These results highlight an effective strategy for high-efficiency solar-thermoelectric generators design and broaden the application potential of narrow-bandgap thermoelectric thin films in photothermal energy conversion.