Document Type

Journal Article

Department/Unit

Department of Physics

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

3-2018

Source Publication Title

ACS Photonics

Volume

5

Issue

3

Start Page

1144

End Page

1150

Publisher

American Chemical Society

Peer Reviewed

1

Copyright

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.

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

Available for download on Monday, April 01, 2019

Included in

Physics Commons

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