A Sequential Slot‐Die Coated Ternary System Enables Efficient Flexible Organic Solar Cells. Issue 3 (8th January 2019)

• Record Type: Journal Article
• Authors: Zhao, Yifan; Wang, Guodong; Wang, Yuheng; Xiao, Tong; Adil, Muhammad Abdullah; Lu, Guanghao; Zhang, Jianqi; Wei, Zhixiang
• Is Part Of: Solar RRL. Volume 3:Issue 3(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-01-08
• Subjects: flexible -- large area -- organic solar cells -- pre‐aggregation -- sequential slot‐die coating; Solar energy -- Periodicals; Photovoltaic power generation -- Periodicals; Solar energy -- Research -- Periodicals; Photovoltaic power generation -- Research -- Periodicals; Periodicals; 333.7923
• DOI: 10.1002/solr.201800333
• Languages: English
• ISSNs: 2367-198X

Abstract

Abstract : For the preparation of flexible organic solar cells (OSCs), the Roll‐to‐Roll slot‐die coating technique is preferable. Herein, a sequential slot‐die (SSD) coating strategy to fabricate flexible OSCs using non halogenated solvent under ambient atmosphere, is developed. The coating order of the active layer materials shows great influence on the performance of OSCs. It is found that, compared with the one‐step coating, the power conversion efficiency (PCE) of devices with an area of 0.75 cm 2, and fabricated by SSD coating process with the polymer as the first layer, is enhanced from 4.86 to 5.51% for the binary system, whereas from 6.09 to 7.32% for the ternary system, showing an increase of 13 and 20% in PCE, respectively. For the devices with a standard small area of 4 mm 2 and large area of 1 cm 2, PCE as high as 9.36 and 7.11% are obtained, respectively, which are among the top value for flexible devices fabricated by slot‐die coating. It turns out that the SSD coating process with the polymer as the first layer assists pre‐aggregation of the polymer to form better crystal domains with face‐on orientation. Therefore, a sequential deposition strategy could provide a new means for manufacturing the high efficiency flexible OSCs. Abstract : A sequential slot ‐die (SSD) coating technique can lead the polymer to form pre‐aggregates, resulting in enhanced crystallinity and face‐on orientation which is superior for charge transport. As a result, large area (1 cm 2 ) flexible devices with a power conversion efficiency of 7.11% are obtained. Therefore this approach offers a new strategy for the fabrication of large area flexible organic solar cells.