Morphological modification induced by external electric field during solution process of organic solar cells

作者：Ma Shou Yuan; Shen Yu Min; Yang Po Ching; Chen Chao Shuo; Lin Ching Fuh^*

来源：Organic Electronics, 2012, 13(2): 297-301.

DOI：10.1016/j.orgel.2011.11.009

• Inverted structure
• Morphology
• Vertical phase separation
• Electric field treatment
• Bulk heterojunction

An electric field was externally applied on the poly(3-hexylthiophene)/[6,6]-phenyl C-61 butyric acid methyl ester (P3HT:PCBM) blend film during the fabrication of the bulk-heterojunction (BHJ) solar cells to induce morphological modification. It influences the vertical ratio of P3HT: PCBM molecules. Because the field is applied externally to the device, its direction can be altered. When the electric field of 5.0 x 10(5)Vm(-1) was applied with the specific direction, it formed a P3HT-rich and rougher surface, compared with that of pristine active layer, to improve the performance of the inverted polymer solar cells. Hence, the current density was improved from 9.15 mA cm(-2) to 9.83 mA cm(-2), and power conversion efficiency increased from 3.16% to 3.51%. This finding provides guidance for morphology engineering in organic materials for higher power conversion efficiency of organic solar cells.

• 出版日期2012-2
• 单位中国科学院电工研究所