摘要
We demonstrate a simple method for achieving high-performance subphthalocyanine (SubPc)/C70 bi-layer organic photovoltaic (OPV) devices through the changing of the C70 thickness. The optical and electrical properties of the OPV devices were decoupled and could be individually manipulated to obtain a significantly increased short-circuit current density (JSC) without reducing the open-circuit voltage and the fill factor. The thickness-independent electrical property of the C70 layer was systematically studied in terms of the dark currents of the OPV devices and the carrier mobilities of the organic layers; the results indicate that the considerable difference in mobility between SubPc and C70 is not detrimental, while the optical-field distribution can be optimized by tuning the C70 thickness. The power conversion efficiency was improved from 2.7 to 4.2% by optimizing the C70 thickness. The optical effect upon the change in the C70 thickness was thoroughly investigated by calculating the optical-field profile and the power dissipation inside the OPV devices on the basis of the transfer matrix method. The calculated results suggest that the optical-field intensity is insufficient in predicting the trend in JSC. Instead, the power dissipation involving the absorption properties of materials and the optical-field distribution of OPV devices can provide deeper insight into the optical condition and indicates the importance of optimizing the film thickness in bi-layer OPV devices. This journal is
原文 | 英語 |
---|---|
頁(從 - 到) | 5617-5626 |
頁數 | 10 |
期刊 | RSC Advances |
卷 | 5 |
發行號 | 8 |
DOIs | |
出版狀態 | 已發佈 - 1月 1 2015 |
對外發佈 | 是 |
ASJC Scopus subject areas
- 化學 (全部)
- 化學工程 (全部)