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Efficiency Enhancement of Organic Solar Cells Using Hydrophobic Antireflective Inverted Moth‐Eye Nanopatterned PDMS Films
Author(s) -
Leem Jung Woo,
Kim Sehwan,
Lee Soo Hyun,
Rogers John A.,
Kim Eunkyoung,
Yu Jae Su
Publication year - 2014
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201301315
Subject(s) - materials science , anti reflective coating , organic solar cell , contact angle , transmittance , wetting , optoelectronics , energy conversion efficiency , substrate (aquarium) , optics , chemical engineering , composite material , polymer , layer (electronics) , oceanography , physics , geology , engineering
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 ( θ CA ) of ≈120° and solar weighted transmittance (SWT) of ≈94.2%, both significantly higher than those ( θ CA ≈ 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 ( J sc ) of 19.74 mA cm ‐2 compared to the OSCs with the bare glass substrates (PCE = 5.16% and J sc = 17.25 mA cm ‐2 ). For the OSCs, the device stability is also studied.