Solar energy conversion is of great interest in developing green and sustainable energy. Herein, we report the solar-to-electricity capability of a new two dimensional (2D) Cu₂S-phenol superlattice (CP-SL) and carbon nanotubes (CNTs) composites for the first time. CP-SL is demonstrated to have a high Seebeck coefficient and a low thermal conductivity comparable to that of metal-organic frameworks. CP-SL based solar thermoelectric generator (STEG) exhibits stable output voltages for long time usages superior to previously reported STEGs. The device is made of p- and n-type modules that are composed of CP-SL/CNT and CP-SL/polyethyleneimine (PEI) doped CNTs (PEI-CNT) composites, respectively. The polarity of the composites is dominated by the CNTs which have higher carrier concentration. The carrier transport mechanism in the composites matches well with a parallel model, indicating the CP-SL and CNT interfaces play a minor role in carrier transport. The maximum ZT value of CP-SL/CNT is achieved by an in-situ growth method, which is about 35 times higher than that of the original CP-SL. These results indicate that 2D CP-SL is a new material with tunable thermoelectric properties and polarities, which may lay a foundation to realize p- and n-type properties in one material for single-material organic electronic devices development.

太阳能转换对开发绿色和可持续能源非常感兴趣。在此，我们报告了一种新的二维（2D）Cu ₂的太阳能发电能力S-苯酚超晶格（CP-SL）和碳纳米管（CNTs）首次复合。与金属有机骨架相比，CP-SL具有较高的塞贝克系数和较低的导热系数。基于CP-SL的太阳能热电发电机（STEG）具有长期稳定的输出电压，优于先前报道的STEG。该设备由p型和n型模块组成，分别由CP-SL / CNT和CP-SL /聚乙烯亚胺（PEI）掺杂的CNT（PEI-CNT）复合材料组成。复合材料的极性主要由具有较高载流子浓度的CNT决定。复合材料中的载流子传输机制与并行模型匹配得很好，这表明CP-SL和CNT界面在载流子传输中起着较小的作用。CP-SL / CNT的最大ZT值是通过原位生长方法获得的，这是原始CP-SL的35倍左右。这些结果表明2D CP-SL是一种具有可调的热电特性和极性的新材料，这可能为在一种材料中实现p型和n型特性奠定了基础，以用于单一材料有机电子器件的开发。