纳米纤维素/环氧树脂复合物用作柔性有机太阳能电池基底

Nanocellulose/Epoxy Resin Composites used as Flexible Organic Solar Cell Substrates

摘要:

为了解决柔性有机太阳能电池基底热膨胀系数大、基底热稳定性不佳的问题，该文提出了一种纳米纤维素增强环氧树脂作为柔性有机太阳能电池基底的方法。根据环氧树脂热膨胀系数高、温度变化时热稳定性不佳，而纳米纤维素透明、热稳定性能良好的特性，用制得的纳米纤维素透明薄膜浸渍环氧树脂获得了新的复合基底材料。结果表明：与纯环氧树脂相比，复合膜的热膨胀系数由46×10-6/K下降至19×10-6/K，透光率可达89%，表面平滑（粗糙度2.15nm），机械性能良好（杨氏模量2.3GPa，抗张强度59MPa）。在此基础上，在复合基底上制备聚(3,4-乙撑二氧噻吩):聚苯乙烯磺酸盐导电电极，在-15~70℃下对其进行了表面形貌、电导率等测试，结果表明，温度变化时电极材料与基底结合良好无开裂，电导率稳定（830~875S/cm）。

Abstract:

In order to solve the problem of high expansion coefficient and poor thermal stabilityof the flexible organic solar cellsubstrates, this paper proposed a method that using cellulose nanofibrils to reinforce epoxy resin as the flexible substrate of organic solar cells. In this paper, the nanocellulose with highly transparent and outstanding thermal stability properties were took to improve the epoxy’s thermal stability that possesses high thermal expansion coefficient, therefor a new nanocomposite substrate material is achieved by preparing a transparent film of nanocellulose impregnated with epoxy resin. The results shown the thermal expansion coefficient of composite film decreases from 46×10-6/K to 19×10-6/K comparing with the pure epoxy resin, and the new substrate also has outstanding light transmittance(89%), smooth surface (roughness 2.15nm), good mechanical properties (Young'smodulus 2.3GPa, tensile strength 59MPa). According to this results, a poly(3,4-ethylenedioxythiophene):polystyrene sulfonate conductive electrode was deposited on the nanocomposite substrate and the surface morphology and conductivity were performed between -15°C to 70°C. The results proved that electrode materials deposited on the substrate hadn’t any crack when the temperature changed, and the conductivity remained stable (830-875S/cm).