Document Type

Journal Article

Department/Unit

Department of Physics

Title

Omnidirectional and broadband light absorption enhancement in 2-D photonic- structured organic solar cells

Language

English

Abstract

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.

Keywords

Organic solar cell, photonic structure, light trapping, omnidirectional and broadband light absorption enhancement, nanoimprint, FDTD simulation

Publication Date

2018

Source Publication Title

ACS Photonics

Publisher

American Chemical Society

Peer Reviewed

1

Copyright

Copyright © 2018 American Chemical Society

Funder

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).

DOI

10.1021/acsphotonics.7b01573

ISSN (electronic)

23304022

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