Journal
ACS PHOTONICS
Volume 5, Issue 3, Pages 1144-1150Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.7b01573
Keywords
organic solar cell; photonic structure; light trapping; omnidirectional and broadband light absorption enhancement; nanoimprint; FDTD simulation
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Funding
- Research Grants Council of Hong Kong Special Administrative Region, China [T23-713/11]
- General Research Fund [12303114, 12302817]
- Hong Kong Baptist University Interinstitutional Collaborative Research Scheme [RC-ICRS/15-16/04]
- Shenzhen Peacock Plan [KQTD20140630110339343]
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The effect of 2-D photonic structures on omnidirectional and broadband light absorption enhancement in organic solar cells (OSCs) is analyzed using a combination of theoretical simulation and experimental optimization. The photonic structures in the active layer, with a blend system of poly[4,8-bis[(2-ethylhexyl)oxy] benzo[1,2-b:4,5-bA]dithiophene-2,6-diyl][3-fluoro-2-[(2- ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl]:[6,6]-phenyl-C70-butyric-acid-methyl-ester (PTB7:PC70BM), were prepared by the nanoimprint method. It shows that the 2-D photonic structures enable not only broadband but also omnidirectional absorption enhancements in the PTB7:PC70BM-based OSCs over a broader angle range of the incident light, leading to > 11% increase in the power conversion efficiency, as compared to an optimal planar control cell. A weak angular dependency on light absorption is a unique feature of the photonic-structured OSCs, which is useful for different applications.
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