Lin, H.-W.H.-W.LinKang, H.-W.H.-W.KangHuang, Z.-Y.Z.-Y.HuangChen, C.-W.C.-W.ChenChen, Y.-H.Y.-H.ChenLin, L.-Y.L.-Y.LinLin, F.F.LinKEN-TSUNG WONG2018-09-102018-09-102012http://www.scopus.com/inward/record.url?eid=2-s2.0-84863187267&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/371786Novel organic/ultrathin low work function metal bilayer cathode buffers for small molecule organic solar cells are proposed. Ultrathin low work function metal layers possess a high built-in electric field for effective carrier extraction and a high cathode reflectivity for maximum absorption in the photoactive layers. This leads to a significant increase of short circuit current density and fill factor of cells. By integrating this bilayer cathode buffer with DTDCTB:C60 small molecular heterojunction, the device exhibits a high power conversion efficiency of up to 5.28%, which is an improvement of 22% compared to a device with a traditional single organic layer buffer. © 2012 Elsevier B.V. All rights reserved.Cathode buffer; Electron transporting layer; Organic photovoltaics; Small molecule solar cells[SDGs]SDG7Cathodes; Electric fields; Heterojunction bipolar transistors; Heterojunctions; Molecules; Solar cells; Solar power generation; Work function; Built-in electric fields; Carrier extraction; Electron transporting layer; High power conversion; Organic photovoltaics; Photoactive layers; Small molecules; Small-molecule organic solar cells; Organic solar cellsjournal article10.1016/j.orgel.2012.05.0492-s2.0-84863187267WOS:000309591200021