Premium
Efficient Polymer Solar Cells with Surface Relief Gratings Fabricated by Simple Soft Lithography
Author(s) -
Na SeokIn,
Kim SeokSoon,
Jo Jang,
Oh SeungHwan,
Kim Juhwan,
Kim DongYu
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200800683
Subject(s) - materials science , grating , lithography , optoelectronics , energy conversion efficiency , polymer , soft lithography , photovoltaic system , polymer solar cell , absorption (acoustics) , organic solar cell , solar cell , diffraction grating , optics , fabrication , composite material , medicine , ecology , alternative medicine , physics , pathology , biology
Polymer‐based photovoltaic cells, with periodic sub‐micrometer structures as an efficient light‐trapping scheme, are investigated to improve the performance of organic solar cells based on poly(3‐hexylthiophene) and 1‐(3‐methoxycarbonyl)propyl‐1‐phenyl‐(6,6)C 61 . A soft lithographic approach that uses photoresponsive azo polymer films as masters and poly(dimethylsiloxane) as stamps is used to form surface relief gratings (SRGs) on the active layers. The effect of periodic gratings on solar cell performance is precisely investigated according to various grating conditions such as period, depth, and dimension. The solar cells with 1D and 2D SRGs present improved incident‐photon‐to‐current conversion efficiencies and an overall increase in power conversion efficiencies, primarily resulting from the enhancement of short‐circuit current density, indicating that periodic structures induce further photon absorption in the active film.