Enhanced charge collection in polymer photovoltaic cells by using an ethanol-soluble conjugated polyfluorene as cathode buffer layer

详细信息    查看全文

• 作者：Yun Zhao ; Zhiyuan Xie ; Chuanjiang Qin ; Yao Qu ; Yanhou Geng ; Lixiang Wang
• 关键词：Photovoltaic cells ; Conjugated polymer ; Buffer layer ; Charge collection
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2009
• 出版时间：May 2009
• 年：2009
• 卷：93
• 期：5
• 页码：604-608
• 全文大小：503 K

文摘

We report enhanced polymer photovoltaic (PV) cells by utilizing ethanol-soluble conjugated poly(9, 9-bis (6′-diethoxylphosphorylhexyl) fluorene) (PF-EP) as a buffer layer between the active layer consisting of poly(3-hexylthiophene)/[6, 6]-phenyl C61-butyric acid methyl ester blend and the Al cathode. Compared to the control PV cell with Al cathode, the introduction of PF-EP effectively increases the shunt resistance and improves the photo-generated charge collection since the slightly thicker semi-conducting PF-EP layer may restrain the penetration of Al atoms into the active layer that may result in increased leakage current and quench photo-generated excitons. The power conversion efficiency is increased ca. 8 % compared to the post-annealed cell with Al cathode.