title: Nanostructured Electron-Selective Interlayer for Efficient Inverted Organic Solar Cells.
abstract: We report a unique nanostructured electron-selective interlayer comprising of In-doped ZnO (ZnO:In) and vertically aligned CdSe tetrapods (TPs) for inverted polymer:fullerene bulkheterojunction (BHJ) solar cells. With dimension-controlled CdSe TPs, the direct inorganic electron transport pathway is provided, resulting in the improvement of the short circuit current and fill factor of devices. We demonstrate that the enhancement is attributed to the roles of CdSe TPs that reduce the recombination losses between the active layer and buffer layer, improve the hole-blocking as well as electron-transporting properties, and simultaneously improve charge collection characteristics. As a result, the power conversion efficiency of PTB7:PC70BM based solar cell with nanostructured CdSe TPs increases to 7.55%. We expect this approach can be extended to a general platform for improving charge extraction in organic solar cells.
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Jiyun
authors.initials: J
authors.lastname: Song
authors.affiliation: School of Chemical and Biological Engineering, The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.|Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Lim
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Donggu
authors.initials: D
authors.lastname: Lee
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: M
authors.initials: M
authors.lastname: Thambidurai
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Jun Young
authors.initials: JY
authors.lastname: Kim
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Myeongjin
authors.initials: M
authors.lastname: Park
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.|Chemistry Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.
authors.forename: Hyung-Jun
authors.initials: HJ
authors.lastname: Song
authors.affiliation: School of Chemistry, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-747, Korea.
authors.forename: Seonghoon
authors.initials: S
authors.lastname: Lee
authors.affiliation: School of Chemical and Biological Engineering, The National Creative Research Initiative Center for Intelligent Hybrids, The WCU Program of Chemical Convergence for Energy & Environment, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Kookheon
authors.initials: K
authors.lastname: Char
authors.affiliation: Department of Electrical and Computer Engineering, Inter-university Semiconductor Research Center, Seoul National University , 1, Gwanak-ro, Gwanak-gu, Seoul 151-744, Korea.
authors.forename: Changhee
authors.initials: C
authors.lastname: Lee
keywords: CdSe tetrapods; bulkheterojunction; electron buffer layer; electron-selective interlayer; nanostructured extraction layer; organic−inorganic hybrid solar cells