Department of Physics
The effect of 2-D photonic-structures on omnidirectional and broadband light absorption enhancement in organic solar cells (OSCs) is analysed using a combination of theoretical simulation and experimental optimization. The photonic structures in the active layers, 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 the optimal planar control cells. A weak angular dependency on light absorption is a unique feature of the photonic-structured OSCs, which is useful for different applications.
Organic solar cell, photonic structure, light trapping, omnidirectional and broadband light absorption enhancement, nanoimprint, FDTD simulation
Source Publication Title
American Chemical Society
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Photonics, copyright © American Chemical Society after peer review and technical editing by the publisher.
To access the final edited and published work see http://dx.doi.org/10.1021/acsphotonics.7b01573.
This work was financially supported by the Research Grants Council of Hong Kong Special Administrative Region, China, Theme-based Research Scheme (T23-713/11); General Research Fund (12303114, 12302817); Hong Kong Baptist University Interinstitutional Collaborative Research Scheme (RC-ICRS/15-16/04); and Shenzhen Peacock Plan (KQTD20140630110339343).
Link to Publisher's Edition
Lan, W., Wang, Y., Jai, S., & Zhu, F. (2018). Omnidirectional and broadband light absorption enhancement in 2-D photonic- structured organic solar cells. ACS Photonics, 5 (3), 1144-1150. https://doi.org/10.1021/acsphotonics.7b01573