中国物理B ›› 2009, Vol. 18 ›› Issue (1): 349-356.doi: 10.1088/1674-1056/18/1/057

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Influence of optical interference and carrier lifetime on the short circuit current density of organic bulk heterojunction solar cells

张春福1, 游海龙2   

  1. (1)Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576; (2)School of Microelectronics, Xidian University, Xi'an 710071, China;Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices, Xi'an 710071, China
  • 收稿日期:2008-07-17 修回日期:2008-10-17 出版日期:2009-01-20 发布日期:2009-01-20

Influence of optical interference and carrier lifetime on the short circuit current density of organic bulk heterojunction solar cells

You Hai-Long(游海龙)a)b) and Zhang Chun-Fu(张春福)c)†   

  1. a School of Microelectronics, Xidian University, Xi'an 710071, China; b Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices, Xi'an 710071, China; c Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117576
  • Received:2008-07-17 Revised:2008-10-17 Online:2009-01-20 Published:2009-01-20

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摘要： Based on simple analytical equations, short circuit current density (JSC) of the organic bulk heterojunction solar cells has been calculated. It is found that the optical interference effect plays a very important role in the determination of JSC; and obvious oscillatory behaviour of JSC was observed as a function of thickness. At the same time, the influence of the carrier lifetime on JSC also cannot be neglected. When the carrier lifetime is relatively short, JSC only increases at the initial stage and then decreases rapidly with the increase of active layer thickness. However, for a relatively long carrier lifetime, the exciton dissociation probability must be considered, and JSC behaves wave-like with the increase of active layer thickness. The validity of this model is confirmed by the experimental results.

关键词: organic solar cells, short circuit current density, optical interference, carrier lifetime

Abstract: Based on simple analytical equations, short circuit current density (JSC) of the organic bulk heterojunction solar cells has been calculated. It is found that the optical interference effect plays a very important role in the determination of JSC; and obvious oscillatory behaviour of JSC was observed as a function of thickness. At the same time, the influence of the carrier lifetime on JSC also cannot be neglected. When the carrier lifetime is relatively short, JSC only increases at the initial stage and then decreases rapidly with the increase of active layer thickness. However, for a relatively long carrier lifetime, the exciton dissociation probability must be considered, and JSC behaves wave-like with the increase of active layer thickness. The validity of this model is confirmed by the experimental results.

Key words: organic solar cells, short circuit current density, optical interference, carrier lifetime

中图分类号:  (Photoelectric conversion)

  • 84.60.Jt
71.35.-y (Excitons and related phenomena) 73.50.Gr (Charge carriers: generation, recombination, lifetime, trapping, mean free paths) 73.61.Ph (Polymers; organic compounds)