To investigate the optimal working electrode for dye-sensitized solar cells (DSSCs), the traditional TiO ₂ film is modified by adding an electron transporting layer of graphene. Different layers of TiO ₂ /graphene/TiO ₂ stacks on the FTO substrate are analyzed. The experimental results show that the TiO ₂ /graphene/ TiO ₂ /graphene/TiO ₂ (TGT2) structure has higher dye loading, which means that more dye molecules can increase the light absorption. In the electrochemical impedance spectroscopy (EIS) analysis, the TGT2 structure has a lower interfacial resistance ( R _ct2 ) of 2.35 Ω at the TiO ₂ /dye/electrolyte interface and a higher electron lifetime (τ _e ) of 64.28 ms. This result represents that the graphene material exerts its properties of good conductivity and high charge carrier mobility to reduce the interfacial resistance and enhance the electron transport capability. The DSSCs with TGT2 structure working electrode has the short circuit current density ( J _SC ) of 10.87 mA/cm ² and photovoltaic conversion efficiency (η) of 4.47%. In this study, the working electrode of DSSC is successfully modified by using a TGT2 structure, with an improved efficiency of 10.6% and short circuit current density ( J _SC ) of 17.7% higher than that of the TiO ₂ working electrode.

中文翻译：

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染料敏化太阳能电池石墨烯电子多重传输层的制备及性能


为了研究染料敏化太阳能电池（DSSC）的最佳工作电极，通过添加石墨烯电子传输层对传统的TiO ₂薄膜进行改性。分析了 FTO 基底上不同层的 TiO ₂ /石墨烯/TiO ₂堆叠。实验结果表明，TiO ₂ /石墨烯/TiO ₂ /石墨烯/TiO ₂ (TGT2)结构具有更高的染料负载量，这意味着更多的染料分子可以增加光吸收。在电化学阻抗谱（EIS）分析中，TGT2结构在TiO ₂ /染料/电解质界面处具有2.35Ω的较低界面电阻（R _ct2 ）和64.28 ms的较高电子寿命（τ _e ）。这一结果表明石墨烯材料发挥其良好的导电性和高载流子迁移率的特性来降低界面电阻并增强电子传输能力。采用TGT2结构工作电极的DSSCs的短路电流密度（J _SC ）为10.87 mA/cm ² ，光电转换效率（η）为4.47%。本研究成功地采用TGT2结构对DSSC工作电极进行了修饰，与TiO ₂工作电极相比，效率提高了10.6%，短路电流密度（ J _SC ）提高了17.7%。