Efficiency Enhancement of Organic Solar Cells Using Hydrophobic Antireflective Inverted Moth‐Eye Nanopatterned PDMS Films. Issue 8 (3rd February 2014)

• Record Type: Journal Article
• Authors: Leem, Jung Woo; Kim, Sehwan; Lee, Soo Hyun; Rogers, John A.; Kim, Eunkyoung; Yu, Jae Su
• Is Part Of: Advanced energy materials. Volume 4:Issue 8(2014:Aug.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2014-02-03
• Subjects: Energy harvesting -- Materials -- Periodicals; Energy conversion -- Materials -- Periodicals; Energy storage -- Materials -- Periodicals; Photovoltaics -- Periodicals; Fuel cells -- Periodicals; Thermoelectric materials -- Periodicals; 621.31
• DOI: 10.1002/aenm.201301315
• Languages: English
• ISSNs: 1614-6832

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Poly‐dimethylsiloxane (PDMS) films with 2D periodic inverted moth‐eye nanopatterns on one surface are implemented as antireflection (AR) layers on a glass substrate for efficient light capture in encapsulated organic solar cells (OSCs). The inverted moth‐eye nanopatterned PDMS (IMN PDMS) films are fabricated by a soft imprint lithographic method using conical subwavelength grating patterns formed by laser interference lithography/dry etching. Their optical characteristics, together with theoretical analysis using rigorous coupled‐wave analysis simulation, and wetting behaviors are investigated. For a period of 380 nm, IMN PDMS films laminated on glass substrates exhibit a hydrophobic surface with a water contact angle (<italic>θ</italic><sub>CA</sub>) of ≈120° and solar weighted transmittance (SWT) of ≈94.2%, both significantly higher than those (<italic>θ</italic><sub>CA</sub>≈ 36° and SWT ≈ 90.3%) of bare glass substrates. By employing IMN PDMS films with a period of 380 nm on glass substrates for OSCs, an enhanced power conversion efficiency (PCE) of 6.19% is obtained mainly due to the increased short‐circuit current density (<italic>J</italic><sub>sc</sub>) of 19.74 mA cm<sup>‐2</sup> compared to the OSCs with the bare glass substrates (PCE = 5.16% and <italic>J</italic><sub>sc</sub> = 17.25 mA cm<sup>‐2</sup>). For the OSCs, the device stability is also studied.</p> </abstract>