Fluorene Conjugated Polymer/Nickel Oxide Nanocomposite Hole Transport Layer Enhances the Efficiency of Organic Photovoltaic Devices

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• 作者：Guan-Chiun Chiou ; Ming-Wei Lin ; Yu-Ling Lai ; Chiao-Kai Chang ; Jian-Ming Jiang ; Yu-Wei Su ; Kung-Hwa WeiYao-Jane Hsu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 25, 2017
• 年：2017
• 卷：9
• 期：3
• 页码：2232-2239
• 全文大小：684K
• ISSN：1944-8252

文摘

A nanocomposite layer comprising the conjugated polymer poly[(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctyl)fluorene] (PFN) and nickel oxide (NiO<sub>xsub>) has been employed as the hole transport layer (HTL) in organic photovoltaics (OPVs) featuring PBDTTBO-C<sub>8sub> and [6,6]-phenyl-C<sub>71sub>-butyric acid methyl ester (PC<sub>71sub>BM) as the active layer. The optimal device incorporating the PFN:NiO<sub>xsub> nanocomposite as the HTLs displayed a power conversion efficiency (PCE) to 6.2%, up from 4.5% for the corresponding device incorporating pristine NiO<sub>xsub> as the HTL layer: a nearly 40% improvement in PCE. X-ray photoelectron spectroscopy (XPS) was used to determine the types of chemical bonding, ultraviolet photoelectron spectroscopy (UPS) to measure the change in work function, and atomic force microscopy (AFM) to examine the morphology of the composite layers. The growth of nickel trioxide, Ni<sub>2sub>O<sub>3sub>, in the PFN:NiO<sub>xsub> layer played a key role in producing the p-doping effect and in tuning the work function, thereby improving the overall device performance.