Synthesis of nanostructured zinc oxide and its composite with carbon dots for DSSCs applications using flexible electrode

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Abstract

ZnO nanowires (ZnO NWs), ZnO nanoparticles (ZnO NPs) and carbon dots (C-dots) were synthesized by hydrothermal, sol-gel and hydrothermal methods respectively. They were also characterized and applied for dye sensitized solar cells (DSSCs). The effects of C-dots on ZnO NWs and ZnO NPs have been evaluated. The C-dots were used at a mole ratio of citric acid (CA) to ethylene diamine (EDA) of 1 : 1.5. These C-dots were found to enhance the performance of the flexible electrode DSSCs. After the addition of C-dots, the power conversion efficiency (PCE) of ZnO NPs was boosted to be two times higher than that of ZnO NPs DSSCs without C-dots. Similarly, the ultraviolet (UV)-band revealed a blue shift, resulting in a lower band gap and a reduced charge transfer resistance, which can enhance the PCE of DSSCs. The loaded quantity on the flexible electrode substrate made of polyethylene terephthalate (PET) was optimized (50 mg). For DSSCs, the PET flexible electrode conductive polymer has produced positive outcomes. For ZnO NWs and ZnO NWs@C-dots, the PCE values were 1.45% and 4.25%; while for ZnO NPs and ZnO NPs@C-dots, they were 2.34% and 5.81%, respectively. This work achieved remarkable and competitive performance when compared to solid (indium tin oxides/glass)-based substrate.

Abstract Image

利用柔性电极合成用于 DSSC 应用的纳米结构氧化锌及其与碳点的复合材料
采用水热法、溶胶-凝胶法和水热法分别合成了氧化锌纳米线(ZnO NWs)、氧化锌纳米颗粒(ZnO NPs)和碳点(C-dots)。研究还对它们进行了表征,并将其应用于染料敏化太阳能电池(DSSC)。评估了 C 点对 ZnO NWs 和 ZnO NPs 的影响。柠檬酸(CA)与乙二胺(EDA)的摩尔比为 1:1.5。研究发现,这些 C 点可提高柔性电极 DSSC 的性能。添加 C 点后,氧化锌氮氧化物的功率转换效率(PCE)比不添加 C 点的氧化锌氮氧化物 DSSC 高出两倍。同样,紫外(UV)带出现蓝移,导致带隙降低,电荷转移电阻减小,从而提高了 DSSC 的 PCE。聚对苯二甲酸乙二醇酯(PET)制成的柔性电极基底上的负载量进行了优化(50 毫克)。对于 DSSC 而言,PET 柔性电极导电聚合物产生了积极的效果。ZnO NWs 和 ZnO NWs@C-dots 的 PCE 值分别为 1.45% 和 4.25%;而 ZnO NPs 和 ZnO NPs@C-dots 的 PCE 值分别为 2.34% 和 5.81%。与基于固体(铟锡氧化物/玻璃)的基底相比,这项工作取得了卓越的性能和竞争力。
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来源期刊
材料导报:能源(英文)
材料导报:能源(英文) Renewable Energy, Sustainability and the Environment, Nanotechnology
CiteScore
13.00
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50 days
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