Kirigami-inspired organic and inorganic film-based flexible thermoelectric devices with built-in heat sink
Kirigami-inspired organic and inorganic film-based flexible thermoelectric devices with built-in heat sink
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DOI：
10.1016/j.nanoen.2023.109213
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发表时间：
2024-01-09
期刊：
影响因子：
17.6
通讯作者：
Bilotti，Emiliano
中科院分区：
文献类型：
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作者：
Zeng，Chongyang;Chen，Kan;Bilotti，Emiliano
热电（TE）设备可以直接将热转化为电，这为实现废热回收提供了独特的机会。然而，传统的TE设备不可避免地使用体积庞大、坚硬且沉重的散热器，限制了实际应用。在此，我们提出了一种完全集成的基于薄膜的TE器件，在六边形蜂窝器件结构中内置翅片作为散热器，同时实现了高TE性能和一致性，实验和建模证实了这一点。一种具有铜电极的柔性卡普顿衬底，集成了碳纳米管（CNT）薄膜或碲化铋（Bi2Te3） TE“腿”，包括n型和p型，对于基于Bi2Te3的器件实现了185.4 nW K−2的显着比功率，对于基于碳纳米管的器件实现了53.1 nW K−2，这要归功于内置翅片的散热效果。此外，定向聚合物薄膜互连的添加，当高于其玻璃化转变温度时收缩，允许单个衬底二维（2D） TE器件自折叠成三维（3D）六边形蜂窝结构，内置翅片，无接触和自主。演示的形状编程kirigami启发的可扩展TE设备为实现自供电应用铺平了道路，该应用包括数百个TE腿，其中包括无机（例如Bi2Te3）和有机（例如碳纳米管面纱）TE材料和集成散热器。
Thermoelectric (TE) devices can convert heat to electricity directly, which offers a unique opportunity to realize waste heat recovery. However, conventional TE devices inevitably use heat sinks, which are bulky, rigid and heavy, limiting practical applications. Herein, we propose a fully integrated film-based TE device with intrinsically built-in fins as heat sink in a hexagonal honeycomb device structure, that simultaneously achieves high TE performance and conformability, as confirmed by experiments and modelling. A flexible Kapton substrate with copper electrodes, integrating either carbon nanotube (CNT) veils or bismuth telluride (Bi2Te3) TE ‘legs’, both of n- and p-type, achieved a remarkable specific power of 185.4 nW K−2for a Bi2Te3-based device and 53.1 nW K−2for a CNT-based device, thanks to the heat dissipation effect granted by the built-in fins. Besides, the addition of oriented polymer films interconnects, contracting when above their glass transition temperature, allowed a single substrate two-dimensional (2D) TE device to self-fold into a three-dimensional (3D) hexagonal honeycomb structure, with built-in fins, contactlessly and autonomously. The demonstrated shape-programmed kirigami-inspired scalable TE device paves the way for realising self-powered applications comprising hundreds of TE legs with both inorganic (e.g., Bi2Te3) and organic (e.g. CNT veils) TE materials and integrated heat sinks.