SiO2基宽光谱减反层/超疏水石墨烯功能协同透明导电薄膜

This project is mainly about the functional cooperation transparent conducting films of SiO2 broadband antireflection/superhydrophobic graphene layer, according to the regulation of SiO2 based nano-porous network on the structure and properties of graphene. Such fascinating properties render the composite films as a promising candidate in applications of photovoltaic cells and devices. The main contents are as follows: (1) Design and preparation of broadband antireflection with controllable and gradient refractive index. To achieve the broadband antireflection effect, the SiO2 based sub-wavelength structure and nano-porous network structure will be fabricated and studied. (2) Preparation of SiO2/graphene composite film at low temperature and its performance regulation. It is important to research the effect of SiO2 based nano-porous network structure on the graphene with connected network channel, and thus on the morphology, light transmission, carrier mobility and band structure of graphene layer. The functional cooperation mechanisms will be further studied. (3) Surface functionalization and wettability regulation of composite film. The effect of SiO2 based nano-porous network structure on the wettability of graphene will enhance the superhydrophobic, self-cleaning, anti-static performance. (4) Applications of composite films in dye-sensitized cells (DSC), CIGS or CdTe thin-film photovoltaic cells. The injection, transport, recombination and collection mechanism of charge and band match in the graphene/semiconductor interface will be explored in this project.

本项目围绕SiO2基纳米多孔网络结构对石墨烯结构和性能的调控，实现高导电性、宽光谱高透光性及超疏水性功能协同的SiO2基减反射层/超疏水石墨烯层复合透明导电薄膜，将在光伏电池器件中具有极大的应用前景。主要研究内容：(1)折射率可控的宽光谱减反纳米结构设计及可控制备。针对太阳能宽频减反，构筑折射率渐变的SiO2基亚波长复合阵列结构和纳米多孔网络结构。(2)复合薄膜低温可控制备及性能调控。研究纳米多孔网络结构对石墨烯连通网络通道的调控，从而对石墨烯层的形貌、透光性、载流子迁移及能带结构的影响及功能协同机制。(3)复合薄膜表面功能化及其浸润特性调控。研究纳米多孔网络结构对石墨烯浸润性的调控，实现超疏水、自清洁、防静电等功能性。(4)复合薄膜在染料敏化(DSC)、铜铟镓硒(CIGS)或碲化镉(CdTe)薄膜光伏电池中应用。探索石墨烯/半导体界面电子注入、传输、复合、收集等影响机制及能级匹配问题。

提高太阳光的透过率，实现宽光谱吸收，并提高光生电子传输性能，是目前制备新型透明导电薄膜，从而提高光伏电池组件转换效率最经济有效的技术途径之一。本课题以SiO2基微纳多级复合结构和石墨烯薄膜构建实现高导电性、宽光谱高透光性及超疏水性功能协同型透明导电薄膜的结构设计、可控制备和性能优化，并对其在光伏器件中的应用进行了研究。首先设计折射率梯度变化的微纳多级复合结构，然后创新通过一种低成本的远程催化方法制备质量良好的石墨烯。研究了微纳多级结构与石墨烯复合薄膜的低温可控制备及性能调控，并在染料染料敏化(DSSC)、铜铟镓硒(CIGS)或碲化镉(CdTe)薄膜光伏电池中应用，探索电子在薄膜界面处的传输、收集等影响机制。其中SiO2-TiO2梯度薄膜结构在400-2500 nm范围内平均透过率相对玻璃基底提高了8.46%，在580nm左右实现透光率最大值，为99.56%，反射率最小值为0.05%。SiO2-TiO2复合薄膜/铜铟镓硒薄膜光伏电池光电转换效率从11.20提高到12.15%。SiO2纳米球多级结构复合薄膜/铜铟镓硒薄膜光伏电池其光电转换效率从11.66提高到12.59%。高导电性、高透光性与超疏水性功能协同的透明导电薄膜，在薄膜光伏器件中将具有极大的应用前景。