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)†
aSchool of Microelectronics, Xidian University, Xi'an 710071, China; bKey Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices, Xi'an 710071, China; cDepartment of Electrical and Computer Engineering, National University of Singapore, Singapore 117576
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.
Received: 17 July 2008
Revised: 17 October 2008
Accepted manuscript online:
You Hai-Long(游海龙) and Zhang Chun-Fu(张春福) Influence of optical interference and carrier lifetime on the short circuit current density of organic bulk heterojunction solar cells 2009 Chin. Phys. B 18 349
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