Efficiency Enhancement in Bulk-Heterojunction Solar Cells Integrated with Large-Area Ag Nanotriangle Arrays

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• 作者：Bo Wu ; Than Zaw Oo ; Xianglin Li ; Xinfeng Liu ; Xiangyang Wu ; Edwin Kok Lee Yeow ; Hong Jin Fan ; Nripan Mathews ; Tze Chien Sum
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：July 19, 2012
• 年：2012
• 卷：116
• 期：28
• 页码：14820-14825
• 全文大小：354K
• 年卷期：v.116,no.28(July 19, 2012)
• ISSN：1932-7455

文摘

Efficiency enhancement in plasmonic bulk heterojunction (PCDTBT:PCBM) organic solar cells (OSCs) is demonstrated with the integration of large-area periodic Ag nanotriangle (NT) arrays (that were fabricated using the cost-effective, high-throughput nanosphere lithography technique) in the OSC device. The improvements to the power conversion efficiency (from 4.24 to 4.52%) and to the short circuit current density (by 12%) are attributed to an increase in exciton generation induced by the strong local E-field and the scattering generated by the localized surface plasmon resonance of the hexagonal NT arrays. These findings are validated by a range of steady-state and transient optical spectroscopy and correlated with device performance data. Importantly, our work demonstrates the feasibility of integrating a simple cost-effective, tailorable, and scalable nanofabrication technique with existing OSC fabrication processes.