Efficiency improvement of organic bifunctional devices by applying omnidirectional antireflection nanopillars

Yu Hsuan Ho, Hsun Liang, Shun Wei Liu, Wei Cheng Tian, Fang-Chung Chen, Pei Kuen Wei*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

OLED/OPV tandem devices have attracted great interest due to their various functions in green technology and potential sensing applications. Here we report a novel concept to improve the luminous efficiency and energy conversion efficiency of tandem bifunctional devices by integrating antireflection structures consisting of irregular nanopillars as the capping layer. The nanopillars were made on flexible polycarbonate substrates by using a nanoimprint method with an anodized aluminum oxide template. The average reflectivity of the patterned polycarbonate substrate at visible wavelengths was reduced to 3.3%. With the antireflection structures, the luminous intensity for bifunctional devices was improved by 41.9% compared to a device with a flat capping layer. The power conversion efficiency was improved from 0.48% to 0.61%, a 27.0% enhancement at normal incidence.

Original languageEnglish
Pages (from-to)9588-9593
Number of pages6
JournalRSC Advances
Volume4
Issue number19
DOIs
StatePublished - 20 Feb 2014

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