title: Efficiency improvement of organic solar cells by tuning hole transport layer with germanium oxide.
abstract: Improving optical property is critical for optimizing the power conversion efficiency of organic solar cells. In the present research, we show that modification of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) layer with GeO2 leads to 15% improvement of power conversion efficiency in a polymer solar cells through enhancement of short circuit currents. Modified PEDOT:PSS layer with optimized concentration of GeO2 assists active layer absorbing much light by playing a role of optical spacer. Using AFM and grazing incidence X-ray diffraction (GIXD) data, we also present the evidence that an addition of GeO2 does not affect crystallinity of active layer.
authors.affiliation: School of Chemical and Biological Engineering, Seoul National University, Seoul 151-744, Korea.
authors.forename: Moon Kee
authors.initials: MK
authors.lastname: Choi
authors.forename: Ju-Hyung
authors.initials: JH
authors.lastname: Kim
authors.forename: Hyunsik
authors.initials: H
authors.lastname: Yoon
authors.forename: Dongha
authors.initials: D
authors.lastname: Tahk
authors.forename: Soonmin
authors.initials: S
authors.lastname: Seo
authors.forename: Kyusoon
authors.initials: K
authors.lastname: Shin
authors.forename: Hong H
authors.initials: HH
authors.lastname: Lee
mesh_terms: D011211:Electric Power Supplies; D004579:Electron Transport / Q000528:radiation effects; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005857:Germanium / Q000737:chemistry* / Q000528:radiation effects; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D012993:Solar Energy
chemical_list: D005857:Germanium; C040516:germanium oxide