Perylene Bisimide as a Promising Zinc Oxide Surface Modifier: Enhanced Interfacial Combination for Highly Efficient Inverted Polymer Solar Cells

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• 作者：Li Nian ; Wenqiang Zhang ; Siping Wu ; Leiqiang Qin ; Linlin Liu ; Zengqi Xie ; Hongbin Wu ; Yuguang Ma
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 25, 2015
• 年：2015
• 卷：7
• 期：46
• 页码：25821-25827
• 全文大小：486K
• ISSN：1944-8252

文摘

We report the application of a perylene bisimide (PBI-H) as zinc oxide (ZnO) surface modifier to afford an organic鈥搃norganic co-interlayer for highly efficient inverted organic photovoltaics (i-OPV). By thermal annealing, a N鈥揨n chemical bond formed between PBI-H and ZnO, inducing close organic鈥搃norganic combination. In addition, this co-interlayer shows decreased work function and increased electron transportation and conductivity, which are benefits for the cathode to enhance charge extraction efficiency and decrease recombination losses. As a result a highly efficient i-OPV was achieved with a power conversion efficiency (PCE) of 9.43% based on this co-interlayer with PTB7:PC₇₁BM as the active layer, which shows over 35% enhancement compared to that of the device without the PBI-H layer. Moreover, this co-interlayer was widely applicable for i-OPVs based on various material systems, such as P3HT:PC₆₁BM and PTB7-Th:PC₇₁BM, resulting in PCE as high as 4.78% and 10.31%, respectively.