Abstract Solution processed NiOx is one of the promising hole transport layer (HTL) for planar perovskite solar cells, which can replace hygroscopic poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT: PSS) HTL. In this study, we investigated effects of ethylenediamine (EDA) additive in NiOx precursor solution (nickel nitrate hexahydrate dissolved in ethyleneglycol) on optoelectronic and surface morphological properties of resultant solution processed NiOx films. By varying EDA content (0–10.0 v/v %) in the precursor, we could find out that adequate EDA additive (~5.0%) provide much reduced electrical resistivity and enhanced optical transmission compared with control NiOx film (No EDA) by suppressing formation of byproducts (i.e. nickel hydroxide). In addition, AFM surface topography showed much compact and dense deposition of NiOx film on ITO electrode. This contributed to improve charge transport properties and suppress charge recombination loss at ITO/perovskite interface, which provided strong enhancement in fill factor from 0.599 to 0.714 in the perovskite solar cells. As a result, a power conversion efficiency (PCE) was strongly increased from 13.9 (No EDA) to 16.7% (EDA 5.0%). This also outperformed the performance (14.3%) of device using PEDOT: PSS, which indicates that the adequate control of EDA additive for NiOx HTL could offer much promising photovoltaic performance.

中文翻译：

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用于高效钙钛矿光伏的溶液处理氧化镍空穴传输层

摘要 溶液处理的 NiOx 是一种很有前途的平面钙钛矿太阳能电池空穴传输层 (HTL)，可以替代吸湿性聚 (3,4-亚乙基二氧噻吩) 聚苯乙烯磺酸盐 (PEDOT: PSS) HTL。在这项研究中，我们研究了 NiOx 前体溶液（溶于乙二醇中的六水合硝酸镍）中乙二胺 (EDA) 添加剂对所得溶液处理的 NiOx 薄膜的光电和表面形态学特性的影响。通过改变前体中的 EDA 含量 (0–10.0 v/v %)，我们可以发现，与对照 NiOx 膜（无 EDA）相比，足够的 EDA 添加剂（~5.0%）通过抑制副产品（即氢氧化镍）的形成。此外，AFM 表面形貌显示在 ITO 电极上的 NiOx 薄膜非常紧凑和致密。这有助于改善电荷传输性能并抑制 ITO/钙钛矿界面处的电荷复合损失，从而使钙钛矿太阳能电池的填充因子从 0.599 大幅提高至 0.714。结果，功率转换效率（PCE）从13.9（无EDA）大幅增加到16.7%（EDA 5.0%）。这也优于使用 PEDOT: PSS 的设备的性能 (1​​4.3%)，这表明对 NiOx HTL 的 EDA 添加剂的充分控制可以提供非常有前途的光伏性能。钙钛矿太阳能电池中的 714。结果，功率转换效率（PCE）从13.9（无EDA）大幅增加到16.7%（EDA 5.0%）。这也优于使用 PEDOT: PSS 的设备的性能 (1​​4.3%)，这表明对 NiOx HTL 的 EDA 添加剂的充分控制可以提供非常有前途的光伏性能。钙钛矿太阳能电池中的 714。结果，功率转换效率（PCE）从13.9（无EDA）大幅增加到16.7%（EDA 5.0%）。这也优于使用 PEDOT: PSS 的设备的性能 (1​​4.3%)，这表明对 NiOx HTL 的 EDA 添加剂的充分控制可以提供非常有前途的光伏性能。