Effective absorption enhancement in small molecule organic solar cells using trapezoid gratings

doi:10.1088/1674-1056/23/3/038803

Abstract We demonstrate that the optical absorption is enhanced in small molecule organic solar cells by using a trapezoid grating structure. The enhanced absorption is mainly attributed to both waveguide modes and surface plasmon modes, which is simulated by using finite-difference time-domain method. The simulated results show that the surface plasmon along the semitransparent metallic Ag anode is excited by introducing the periodical trapezoid gratings, which induce the increase of high intensity field in the donor layer. Meanwhile, the waveguide modes result in a high intensity field in acceptor layer. The increase of field improves the absorption of organic solar cells significantly, which is demonstrated by simulating the electrical properties. The simulated results also show that the short-circuit current is increased by 31% in an optimized device, which is supported by the experimental measurement. Experimental result shows that the power conversion efficiency of the grating sample is increased by 7.7%.

Keywords: organic solar cells localized surface plasmon waveguide

Received: 13 May 2013
Revised: 19 July 2013
Accepted manuscript online:

PACS:	88.40.jr	(Organic photovoltaics)
	88.40.hj	(Efficiency and performance of solar cells)
	42.15.Eq	(Optical system design)
	42.79.Dj	(Gratings)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61036010 and 61177070), the National Basic Research Program of China (Grant Nos. 2011CBA00608 and 2012CB619203), and the National Key Research Program of China (Grant No. 2011ZX01015-001).

Corresponding Authors: Xu Yun
E-mail: xuyun@semi.ac.cn

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Xiang Chun-Ping (相春平), Jin Yu (金玉), Liu Jie-Tao (刘杰涛), Xu Bin-Zong (许斌宗), Wang Wei-Min (汪卫敏), Wei Xin (韦欣), Song Guo-Feng (宋国峰), Xu Yun (徐云) Effective absorption enhancement in small molecule organic solar cells using trapezoid gratings 2014 Chin. Phys. B 23 038803

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Effective absorption enhancement in small molecule organic solar cells using trapezoid gratings

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