title: Solution-processed organic photovoltaics based on indoline dye molecules developed in dye-sensitized solar cells.
abstract: A donor-acceptor (D-A) type indoline dye, D149, was used as an electron donor in solution-processed organic solar cells (OSCs). For bulk-heterojunction (BHJ) type OSCs with PC70BM as electron acceptor, the power conversion efficiency (PCE) is sensitive to the amount of D149 in the D149/PC70BM blend film. When the concentration of D149 in the blend film was as low as 5%, the highest PCE of up to 1.29%, together with a short-circuit current density (Jsc) of 4.58 mA·cm-2, an open-circuit voltage (Voc) of 0.90 V and a fill factor (FF) of 0.31, was achieved. In order to improve the PCE of D149-based OSCs, a bilayer-heterojunction configuration with C70 as electron acceptor has been employed. By optimizing the thickness of the D149 layer and varying the electron- and hole-transport layers, a highest PCE of up to 2.28% with a Jsc of 4.38 mA·cm-2, a Voc of 0.77 V, and an FF of 0.62 was achieved under AM 1.5G solar illumination (100 mW·cm-2).
authors.affiliation: Department of Organic Device Engineering, Research Center for Organic Electronics, Yamagata University, Yonezawa, Yamagata 992-8510, Japan.
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Liu
authors.forename: Haruhiko
authors.initials: H
authors.lastname: Ojima
authors.forename: Ziruo
authors.initials: Z
authors.lastname: Hong
authors.forename: Junji
authors.initials: J
authors.lastname: Kido
authors.forename: Wenjing
authors.initials: W
authors.lastname: Tian
authors.forename: Xiao-Feng
authors.initials: XF
authors.lastname: Wang
mesh_terms: D004396:Coloring Agents / Q000737:chemistry*; D007211:Indoles / Q000737:chemistry*; D015394:Molecular Structure; D012993:Solar Energy; D012996:Solutions; D013472:Sunlight
chemical_list: D004396:Coloring Agents; D007211:Indoles; D012996:Solutions; C057812:indoline