Sodium doping in copper-phthalocyanine/C₆₀ heterojunction for organic photovoltaic applications

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• 作者：Hui-Ju Chen ; Hsuan-Ta Wu ; Kuang-Teng Hung ; Sheng-Wen Fu ; Chuan-Feng Shih
• 关键词：CuPc ; C60 ; Organic solar cell ; Doping ; Sodium
• 刊名：Thin Solid Films
• 出版年：2013
• 出版时间：1 October, 2013
• 年：2013
• 卷：544
• 期：Complete
• 页码：249-253
• 全文大小：511 K

文摘

Sodium was incorporating at the copper-phthalocyanine (CuPc)/C₆₀ interface in CuPc/C₆₀-based small-molecular solar cells to enhance their power conversion efficiency. C₆₀ was deposited on slightly sodium-doped CuPc. Post-annealing improved the cell properties. Post-annealing doubled the conversion efficiency of the least sodium-doped devices (75 ¡ãC, 40 min). The electron/hole mobility ratio gradually approached unity as the annealing time increased, indicating that a reduction in the space charge accumulation was the main cause of the increase of the short-circuit current. The mechanism of enhancement of carrier transport by annealing was investigated by making capacitance-voltage measurements and performing corresponding depth-profile analyses.