Tuning the wettability of the blade enhances solution-sheared perovskite solar cell performance
Tuning the wettability of the blade enhances solution-sheared perovskite solar cell performance
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DOI：
10.1016/j.nanoen.2020.104830
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发表时间：
2020-08-01
期刊：
影响因子：
17.6
通讯作者：
Shin, Byungha
中科院分区：
文献类型：
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作者：
Lee, Hyeon Seok;Kim, Min Kyu;Shin, Byungha
溶液剪切法是一种很有前景的可大规模制备钙钛矿型薄膜的技术，是实现钙钛矿型太阳能电池商业化的重要因素。到目前为止，用于调整薄膜性能的溶液剪切参数主要受衬底温度和镀膜速度的限制。在这项工作中，证明了涂层刀片的润湿性强烈地影响薄膜的性能，从而提高了功率转换效率(PCE)。具体地说，在所有其他参数固定的情况下，渲染刀片去湿可生成更厚的薄膜和更大的微晶尺寸。这与光捕获效率和载流子寿命的增加有关。另一方面，质构程度与刀片的润湿性无关；相反，在特定的涂布速度下，质构程度最高。在此涂布速度下，使用去湿刀片，获得了19.47%的最佳相变效率。
Solution-shearing is a promising technique to generate a perovskite thin film over a large area in a scalable manner, which is an important factor for the commercialization of perovskite solar cells. Thus far, solution-shearing parameters that were utilized to tune the thin-film properties have mainly been restricted to substrate temperature and coating speed. In this work, it is demonstrated that the wettability of the coating blade strongly influences the thin film properties, through which improved power conversion efficiency (PCE) was resulted. Specifically, with all other parameters fixed, rendering the blade de-wetting generates thicker films with larger crystallite size. This was correlated to the increase in light harvesting efficiency and carrier lifetime. The degree of texturing, on the other hand, was independent of the wettability of the blade; rather, it was the highest at a specific coating speed. At this coating speed using a de-wetting blade, the best PCE of 19.47% was achieved.