title: Efficient light trapping in inverted polymer solar cells by a randomly nanostructured electrode using monodispersed polymer nanoparticles.
abstract: The randomly nanotextured back electrode provides a simple and efficient route for enhancing photocurrent in polymer solar cells (PSCs) by light trapping, which can increase light absorption within a finite thickness of the active layer. In this study, we incorporated mono-disperse 60 nm polystyrene nanoparticles (PS NPs) into a 50 nm thick poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) anode buffer layer (ABL) to create a randomly nanotextured back electrode with 10 nm height variations in inverted-type PSCs. The roughened interface between the PS NP-PEDOT:PSS ABL and the Ag electrode scatters light in the visible range, leading to efficient light trapping within the device and enhanced light absorption in the active layer. Inverted PSCs with randomly nanotextured electrodes (φ(NP) = 0.31) showed short-circuit current density (J(SC)) and power conversion efficiency (PCE) values that were 15% higher than those of control devices with flat electrodes. External quantum efficiency, reflectance, and optical light scattering as a function of ϕ(NP) were examined to determine the origin of the enhancement in J(SC) and PCE.
authors: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea.
authors: Dong Jin
authors: DJ
authors: Kang
authors: Hyunbum
authors: H
authors: Kang
authors: Changsoon
authors: C
authors: Cho
authors: Ki-Hyun
authors: KH
authors: Kim
authors: Seonju
authors: S
authors: Jeong
authors: Jung-Yong
authors: JY
authors: Lee
authors: Bumjoon J
authors: BJ
authors: Kim
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D008027:Light; D053758:Nanoparticles / Q000737:chemistry*; D016566:Organoselenium Compounds / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D012993:Solar Energy; D013876:Thiophenes / Q000737:chemistry
chemical_list: D016566:Organoselenium Compounds; D011108:Polymers; D011137:Polystyrenes; D013876:Thiophenes; C533756:poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate); C526212:poly(3-hexyl)selenophene