Simultaneous enhancement in both large-area coatability and photovoltaic performance of inverted organic solar cells with co-solvent

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• 作者：Yun-Ru Hong ; Pin-Kuan Chen ; Jen-Chun Wang ; Ming-Kun Lee ; Sheng-Fu Horng ; Hsin-Fei Meng
• 关键词：Large area manufacturing ; Organic solar cells ; Co-solvent ; Blade coating ; Light soaking
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：January, 2014
• 年：2014
• 卷：120
• 期：part_PA
• 页码：197-203
• 全文大小：4514 K

文摘

We report our observation of simultaneous enhancement in large-area coatability and photovoltaic performance for blade-coated inverted P3HT:PCBM organic solar cells with DCB:hexane co-solvent. The addition of hexane improves greatly the wettability of P3HT:PCBM blend layer on Cs₂CO₃ treated ITO and leads to excessively higher P3HT surface concentration due to the incongruent evaporation of hexane and DCB. A post-processing light soaking was found to further improve the photovoltaic performance for blade-coated devices prepared with co-solvent by adjusting the P3HT surface concentration ratio for more favorable carrier transport, as evidenced by the disappearance of current suppression at forward bias and significant increase in V_oc after light soaking. Since large-area manufacturing is the key to full commercialization of organic solar cells, the use of co-solvent, combined with light soaking, may be crucial for the development of inverted organic solar cells.