Abstract

In this study, the graphene oxide (GO)-TiO₂ nanocomposite film prepared by the sol–gel method was used to optimize the photoelectric performance of the perovskite solar cells (PSCs), which structure is based on the carbon electrode and no hole transport layer. Through a series of scientific experiments, it has been proved that the GO–TiO₂ nanocomposite film has excellent electrical properties. The electron transport layer which containing 1 wt% of GO makes the PSCs have the most excellent performance. Compared with the controlling PSCs, the photoelectric conversion efficiency of PSCs, which containing 1 wt% GO, increased by 9.3%, from 12.44 to 13.60%. Short-circuit current density (Jsc) increased by 5.99%, from 21.55 to 22.84 mA/cm², and open circuit voltage remained basically unchanged. It can be seen from the measurement results that the trend of incident photon-to-electron conversion efficiency spectrum is consistent with J–V characteristics, indicating that the PSCs device containing 1 wt% GO has the best electron extraction and transfer performance. However, when too much GO is used, the increased surface charge trap state will lead to the acceleration of carrier recombination and the decrease of electron transport path, and the photovoltaic parameters show a downward trend.

中文翻译：

---

通过将GO掺入介孔结构的TiO 2层来增强钙钛矿太阳能电池中的电子传输

摘要

在这项研究中，通过溶胶-凝胶法制备的氧化石墨烯（GO）-TiO ₂纳米复合薄膜用于优化钙钛矿型太阳能电池（PSC）的光电性能，该结构基于碳电极且无空穴传输层。通过一系列的科学实验，已经证明GO–TiO ₂纳米复合膜具有优异的电性能。包含1 wt％的GO的电子传输层使PSC具有最优异的性能。与对照PSC相比，GO含量为1％（重量）的PSC的光电转换效率从12.44提高到13.60％，提高了9.3％。短路电流密度（Jsc）从21.55增至22.84 mA / cm ²增加了5.99％，开路电压基本保持不变。从测量结果可以看出，入射光子-电子转换效率谱的趋势与J - V特性一致，表明含有1 wt％GO的PSCs器件具有最佳的电子提取和转移性能。然而，当使用过多的GO时，增加的表面电荷陷阱状态将导致载流子复合加速和电子传输路径减少，并且光伏参数呈现下降趋势。