Low-Work-Function, ITO-Free Transparent Cathodes for Inverted Polymer Solar Cells

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• 作者：Zhichao Xue ; Xingyuan Liu ; Ying Lv ; Nan Zhang ; Xiaoyang Guo
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：7
• 期：36
• 页码：19960-19965
• 全文大小：323K
• ISSN：1944-8252

文摘

A low-work-function, indium tin oxide (ITO)-free transparent cathode having a tin oxide (SnO_X)/Ag/SnO_X/bismuth oxide (Bi₂O₃) (SASB) structure is developed without using annealing treatment. This represents the first time that Bi₂O₃ has been introduced to lower the work function of transparent electrodes. The SASB transparent cathode exhibits excellent photoelectric properties with a maximum transmittance of 鈭?8%, a low sheet resistance of 鈭?.0 惟路sq^鈥?, and a suitable work function of 4.22 eV that matches the lowest unoccupied molecular orbital level of the acceptor for exacting electrons efficiently. The power conversion efficiency of the polymer solar cell with the SASB electrode is 6.21%, which is comparable to that of ITO-based devices. The results indicate that SASB is a good alternative to ITO as transparent cathodes in optoelectronic devices.