Department of Physics and EHSRC , University of Ulsan , Ulsan 44610 , Republic of Korea.
Department of Materials Physics , Dong-A University , Busan 49315 , Republic of Korea.
ACS Appl Mater Interfaces. 2018 Dec 5;10(48):41578-41585. doi: 10.1021/acsami.8b15551. Epub 2018 Nov 21.
The introduction of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) as a standard hole transport layer greatly increased the efficiency of early organic solar cells. However, because PEDOT:PSS has a metallic property, it can still form a barrier by means of metal-semiconductor contact at its interface with the photoactive layer. In this study, we modified the PEDOT:PSS surface with hydroquinone (HQ) to remove that barrier. HQ treatment of the PEDOT:PSS surface lowered the hole transport barrier at the interface between the PEDOT:PSS and the active layer. In addition, because of the secondary doping effect of HQ, the sheet resistance of the PEDOT:PSS surface decreased by almost 2 orders of magnitude. As a result, the device fabricated with the HQ-modified PEDOT:PSS showed a 28% increase in efficiency compared to the device without HQ treatment. Modifying the PEDOT:PSS surface with HQ solution is an easy way to effectively boost the performance of polymer solar cells.
聚（3,4-亚乙基二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）作为标准空穴传输层的引入极大地提高了早期有机太阳能电池的效率。然而，由于 PEDOT：PSS 具有金属性质，因此它仍然可以通过与光活性层的金属-半导体接触在其界面处形成势垒。在这项研究中，我们用对苯二酚（HQ）修饰 PEDOT：PSS 表面以去除该势垒。HQ 处理 PEDOT：PSS 表面降低了 PEDOT：PSS 与活性层之间界面处的空穴传输势垒。此外，由于 HQ 的二次掺杂效应，PEDOT：PSS 表面的方阻降低了近 2 个数量级。结果，与未经过 HQ 处理的器件相比，用 HQ 修饰的 PEDOT：PSS 制成的器件的效率提高了 28%。用 HQ 溶液修饰 PEDOT：PSS 表面是一种有效提高聚合物太阳能电池性能的简单方法。
