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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrical and Optical Properties of ZnO Processed by Atomic Layer Deposition in Inverted Polymer Solar Cells
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Electrical and Optical Properties of ZnO Processed by Atomic Layer Deposition in Inverted Polymer Solar Cells

机译：倒置聚合物太阳能电池中原子层沉积处理的ZnO的电学和光学性质

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摘要

We report on the photovoltaic properties of inverted polymer solar cells where the transparent electron-collecting electrode is formed by a ZnO-modified indium-tin oxide (ITO) electrode. The ZnO layers were deposited by atomic layer deposition (ALD) with varying thicknesses from 0.1 to 100 nm. The work function, surface roughness, and morphology of ITO/ZnO were found to be independent of the ZnO thickness. However, the device performance was found to be strongly dependent on a critical ZnO thickness, around 10 nm. Below the critical thickness the device performance was degraded because of the appearance of a "kink" in the current-voltage characteristics. The kink features became less pronounced after ultraviolet (UV) exposure. This was attributed to oxygen desorption, leading to an increased conductivity of the ZnO layer. At and above this critical thickness, the device performance significantly improved and no longer depended strongly on the thickness of the ZnO layer, in agreement with optical simulations. Instead, these optical simulations showed that the thickness of the active layer plays a more important role than the thickness of the ZnO layer in optimizing the photovoltaic properties of inverted solar cells. Inverted polymer, solar cells with an increased thickness of the active layer showed a power conversion efficiency (PCE) of 3.06% estimated for AM1.5G, a 100 mW cm~(-2) illumination.
机译：我们报告了反向聚合物太阳能电池的光电性能，其中透明电子收集电极由ZnO改性的铟锡氧化物（ITO）电极形成。 ZnO层通过原子层沉积（ALD）沉积，厚度从0.1到100 nm不等。发现ITO / ZnO的功函数，表面粗糙度和形态与ZnO厚度无关。但是，发现器件性能在很大程度上取决于临界ZnO厚度（约10 nm）。低于临界厚度，由于电流-电压特性中出现“扭结”，导致器件性能下降。紫外线（UV）暴露后，扭结特征变得不太明显。这归因于氧的解吸，导致ZnO层的电导率增加。在此临界厚度以上，与光学模拟相一致，器件性能得到了显着改善，不再严格取决于ZnO层的厚度。相反，这些光学模拟表明，在优化倒置太阳能电池的光伏性能中，活性层的厚度比ZnO层的厚度更重要。有源层厚度增加的倒置聚合物太阳能电池显示出对AM1.5G（100 mW cm〜（-2）照明）估计的功率转换效率（PCE）为3.06％。

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