Optimizing the light absorption of graphene-based organic solar cells by tailoring the weak microcavity with dielectric/graphene/dielectric multilayer

Chen, Yi; Long, Yongbing; Liu, Yangtian; Shen, Liang; Zhang, Yangdong; Deng, Qiguang; Zheng, Zhuoshen; Yu, Wenjuan; Ruan, Shenping
August 2013
Applied Physics Letters;8/5/2013, Vol. 103 Issue 6, p063301
Academic Journal
Investigation into the organic solar cells (OSCs) with graphene electrode demonstrates that the weak-microcavity (WMC) constructed between the transparent electrode and top metal electrode plays an important role in the absorption properties of the devices. If the WMC structure is not optimized, the absorption of the graphene-based devices cannot surpass that of OSC devices with indium tin oxide electrode. By employing dielectric/graphene/dielectric multilayer to optimize the WMC, the absorption can be improved by a maximum value of 21.1% within a broad wavelength range of 410-636 nm. Correspondingly, an improvement of 12.1% in total absorbed photons is achieved for the device.


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