Efficiency Improvement of Organic Solar Cells via Introducing Combined Anode Buffer Layer To Facilitate Hole Extraction

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• 作者：Xinyuan Zhang ; Zhiqi Li ; Zhihui Zhang ; Shujun Li ; Chunyu Liu ; Wenbin Guo ; Liang Shen ; Shanpeng Wen ; Songnan Qu ; Shengping Ruan
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：July 7, 2016
• 年：2016
• 卷：120
• 期：26
• 页码：13954-13962
• 全文大小：580K
• 年卷期：0
• ISSN：1932-7455

文摘

In this article, we introduce a new method to assist hole extraction by incorporating carbon nanodots (CNDs) interfacial layer between active layer and hole-transporting layer for organic solar cells (OSCs). Under an optimal concentration of CNDs and specific film-forming conditions, a simultaneous enhancement of short-circuit current density (J_SC) and fill factor (FF) was achieved, leading to the optimal power conversion efficiency up to 7.22%. Due to the nice conductivity of CNDs, the interlayer effectively bridged the separated islands of active layer to transport free charge carriers toward correct electrodes and reduced charge carrier recombination. The employment of interface modification depicted here can also provide a rough and uniform surface coating on polymer photolayer, leading to improved morphology and closer interface contact, and thus reduce the series resistance and increase FF of OSCs. In addition, the incorporation of CNDs also increased the light-harvesting of active layer. Therefore, the CNDs interfacial layer could play a dual role in the improvement of optical and electrical properties for OSCs.