材料科学
等离子体子
光电子学
载流子
有机太阳能电池
活动层
纳米材料
纳米颗粒
等离子太阳电池
纳米技术
电子
图层(电子)
能量转换效率
聚合物太阳能电池
聚合物
复合材料
薄膜晶体管
物理
量子力学
作者
Di Zhang,Wallace C. H. Choy,Fengxian Xie,Wei E. I. Sha,Xinchen Li,Baofu Ding,Kai Zhang,Fei Huang,Yong Cao
标识
DOI:10.1002/adfm.201203776
摘要
Abstract Optical effects of the plasmonic structures and the materials effects of the metal nanomaterials have recently been individually studied for enhancing performance of organic solar cells (OSCs). Here, the effects of plasmonically induced carrier generation and enhanced carrier extraction of the carrier transport layer (i.e., plasmonic‐electrical effects) in OSCs are investigated. Enhanced charge extraction in TiO 2 as a highly efficient electron transport layer by the incorporation of metal nanoparticles (NPs) is proposed and demonstrated. Efficient device performance is demonstrated by using Au NPs incorporated TiO 2 at a plasmonic wavelength (560–600 nm), which is far longer than the originally necessary UV light. By optimizing the concentration ratio of the Au NPs in the NP‐TiO 2 composite, the performances of OSCs with various polymer active layers are enhanced and efficiency of 8.74% is reached. An integrated optical and electrical model, which takes into account plasmonic‐induced hot carrier tunneling probability and extraction barrier between TiO 2 and the active layer, is introduced. The enhanced charge extraction under plasmonic illumination is attributed to the strong charge injection of plasmonically excited electrons from NPs into TiO 2 . The mechanism favors trap filling in TiO 2 , which can lower the effective energy barrier and facilitate carrier transport in OSCs.
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