Organic solar cells using plasmonics of Ag nanoprisms

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• 作者：Hak Seob Noh ; Eun Hei Cho ; Hyo Min Kim ; Yoon Deok Han ; Jinsoo Joo ; ^{jjoo@korea.ac.kr}
• 关键词：Organic solar cell ; Poly(3-hexylthiophene) ; Surface plasmon ; Ag nanoparticle ; Local field enhancement ; Nanoprism
• 刊名：Organic Electronics
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：14
• 期：1
• 页码：278-285
• 全文大小：1114 K

文摘

We demonstrate plasmonic effects in bulk heterojunction organic solar cells (OSCs) consisting of poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C₆₁-butyric acid methyl ester (PCBM) by incorporating silver (Ag) triangular shaped nanoparticles (nanoprisms; NPSs) into a poly(3,4-ethylenedioxythiophene) buffer layer. The optical absorption and geometric characteristics of the Ag NPSs were investigated in terms of their tunable in-plane dipole local surface plasmon resonance (LSPR) bands. The photovoltaic characteristics showed that the power conversion efficiency (PCE) of the plasmonic OSCs was enhanced by an increase of short circuit current (J_sc) compared to that of the reference cells without any variation in electrical properties. The enhanced J_sc is directly related to the enhancement of optical absorption efficiency by the LSPR of the Ag NPSs. We measured the photovoltaic characteristics of the plasmonic OSCs with various distances between the Ag NPSs and the P3HT:PCBM active layer, in which the PCEs of the plasmonic OSCs decreased with increasing distance. This suggests that the increase of photocurrent and optical absorption was due to near field enhancement (i.e., intensified incident light on the active layer) by the LSPR of the Ag NPSs.