Abstract We demonstrate for the first time, the photovoltaic performance of perovskite solar cells (PSCs) by employing nitrogen-doped graphene/ZnO nanorod nanocomposites (NG-ZnO NR NCs) as an electron transport layer (ETL). A series of PSCs are fabricated by varying the NG concentration from 0 to 1 wt% with an increment of 0.2 wt% in ZnO NRs having a device structure of FTO/NG-ZnO NR NCs/CH3NH3PbI3/Spiro-MeOTAD/Ag. The perovskite films grown on NG-ZnO NR NCs exhibited a uniform film with high surface coverage area with an improved crystallinity. By employing photoluminescence measurements, it was found that NG-ZnO NR NCs reduced the interfacial resistance by improving charge carrier extraction, which is in correlation with an improvement in photocurrent and fill factor in the corresponding devices. At an optimized concentration of NG (0.8 wt%) in ZnO NRs, PSCs obtained an improvement in photocurrent from 17.38 mA/cm2 to 21.98 mA/cm2 and the power conversion efficiency from 12.87% to 16.82%, respectively.

中文翻译：

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使用氮掺杂石墨烯/ZnO纳米棒复合材料作为电子传输层的高效钙钛矿太阳能电池

摘要 我们首次展示了钙钛矿太阳能电池 (PSC) 的光伏性能，其采用掺氮石墨烯/ZnO 纳米棒纳米复合材料 (NG-ZnO NR NCs) 作为电子传输层 (ETL)。通过在具有 FTO/NG-ZnO NR NCs/CH3NH3PbI3/Spiro-MeOTAD/Ag 器件结构的 ZnO NRs 中以 0.2 wt% 的增量改变 NG 浓度，制备一系列 PSC。在 NG-ZnO NR NCs 上生长的钙钛矿薄膜表现出均匀的薄膜，具有高表面覆盖面积和改善的结晶度。通过使用光致发光测量，发现 NG-ZnO NR NCs 通过改善电荷载流子提取降低了界面电阻，这与相应器件中光电流和填充因子的改善有关。在优化的 NG 浓度 (0.