Open AccessRealization of efficient semitransparent organic photovoltaic cells with metallic top electrodes: utilizing the tunable absorption asymmetry
Author(s) -
Dongil Han,
Hoyeon Kim,
Eun Jig Lee,
Myungsoo Seo,
Seunghyup Yoo
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.00a513
Subject(s) - opacity , materials science , cathode , optics , absorption (acoustics) , energy conversion efficiency , optoelectronics , anode , photovoltaic system , reflection (computer programming) , electrode , total internal reflection , organic solar cell , asymmetry , chemistry , physics , polymer , ecology , quantum mechanics , computer science , composite material , biology , programming language
Efficient semitransparent organic photovoltaic (OPV) cells are presented in an inverted geometry employing ZnS/ Ag/ WO₃ (ZAW) as a top anode and ITO/ Cs₂CO₃ as a bottom cathode. Upon identification of the light absorption that differs depending on the illumination direction, the degree of the absorption asymmetry is tuned by varying the ZAW structure to maximize the efficiency for one direction or to balance it for both directions. Power conversion efficiency close to that of conventional opaque OPV cells is demonstrated in semitransparent cells for the ITO side illumination by taking advantage of the internal reflection occurring at the organic/ZAW interface. Cells with efficiencies that are reduced but balanced for both illumination directions are also demonstrated.