材料科学
能量转换效率
纳米颗粒
有机太阳能电池
胶体
化学工程
图层(电子)
离子
纳米技术
光电子学
化学
有机化学
聚合物
复合材料
工程类
作者
David Garcia Romero,Lorenzo Di Mario,Feng Yan,Carolina Mishell Ibarra‐Barreno,Suhas Mutalik,Loredana Proteşescu,Petra Rudolf,Maria Antonietta Loi
标识
DOI:10.1002/adfm.202307958
摘要
Abstract In organic solar cells, the interfaces between the photoactive layer and the transport layers are critical in determining not only the efficiency but also their stability. When solution‐processed metal oxides are employed as the electron transport layer, the presence of surface defects can downgrade the charge extraction, lowering the photovoltaic parameters. Thus, understanding the origin of these defects is essential to prevent their detrimental effects. Herein, it is shown that a widely reported and commercially available colloidal SnO 2 dispersion leads to suboptimal interfaces with the organic layer, as evidenced by the s‐shaped J–V curves and poor stability. By investigating the SnO 2 surface chemistry, the presence of potassium ions as stabilizing ligands is identified. By removing them with a simple washing with deionized water, the s‐shape is removed and the short‐circuit current is improved. It is tested for two prototypical blends, TPD‐3F:IT‐4F and PM6:L8:BO, and for both the power conversion efficiency is improved up to 12.82% and 16.26%, from 11.06% and 15.17% obtained with the pristine SnO 2 , respectively. More strikingly, the stability is strongly correlated with the surface ions concentration, and these improved devices maintain ≈87% and ≈85% of their initial efficiency after 100 h of illumination for TPD‐3F:IT‐4F and PM6:L8:BO, respectively.
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