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Issue 30, 2018
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Improved light harvesting efficiency of semitransparent organic solar cells enabled by broadband/omnidirectional subwavelength antireflective architectures

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Abstract

We report organic solar cells (OSCs) with subwavelength architectured polydimethylsiloxane (SWA-PDMS) as an antireflective (AR) layer on a glass substrate for not only enhancing the efficiency but also increasing the transparency of the devices. These subwavelength architectures (SWAs) on PDMS layers are fabricated using a soft imprint lithography technique via an anodic aluminum oxide mold. The effect of optical characteristics of SWA-PDMS with respect to the period and diameter of SWAs, along with the theoretical analysis using rigorous coupled-wave analysis simulation, is investigated. Consequently, the SWA-PDMS/glass with a period and diameter of 125 nm and 80 nm, respectively, is obtained as the optimal sample, exhibiting the highest average transmittance (Tavg) of ∼95.2%, which is much higher compared to that of bare glass (Tavg ∼92.08%). By employing the optimal SWA-PDMS on the glass surface of opaque and semitransparent OSCs as an AR layer, their power conversion efficiency is improved from 8.67 to 10.59% and 7.07 to 8.52%, respectively. Additionally, the average visible transmittance (AVT) of the semitransparent OSC is increased from 23.0 to 26.2% with significantly improved color coordinates as the AR layer is employed. Also, the OSCs with SWA-PDMS having a relatively high hydrophobic nature exhibit a stable performance in the ambient environment.

Graphical abstract: Improved light harvesting efficiency of semitransparent organic solar cells enabled by broadband/omnidirectional subwavelength antireflective architectures

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Publication details

The article was received on 18 May 2018, accepted on 28 Jun 2018 and first published on 29 Jun 2018


Article type: Paper
DOI: 10.1039/C8TA04657C
Citation: J. Mater. Chem. A, 2018,6, 14769-14779
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    Improved light harvesting efficiency of semitransparent organic solar cells enabled by broadband/omnidirectional subwavelength antireflective architectures

    B. Dudem, J. W. Jung and J. S. Yu, J. Mater. Chem. A, 2018, 6, 14769
    DOI: 10.1039/C8TA04657C

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