title: Improved Ambient-Stable Perovskite Solar Cells Enabled by a Hybrid Polymeric Electron-Transporting Layer.
abstract: In this work, an efficient inverted perovskite solar cell with decent ambient stability is successfully demonstrated by employing an n-type polymer, poly{[N,N'-bis(2-octyldodecyl)-1,4,5,8-naphthalene diimide-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (N2200), as the electron-transporting layer (ETL). The device performance can be further enhanced from a power conversion efficiency (PCE) of 15 to 16.8 % by tailoring the electronic properties of N2200 with a polymeric additive, poly[9,9-bis(6'-(N,N-diethylamino)propyl)-fluorene-alt-9,9-bis(3-ethyl(oxetane-3-ethyloxy)-hexyl) fluorene] (PFN-Ox). More importantly, the device derived from this hybrid ETL can maintain good ambient stability inherent from the pristine N2200 ETL, for which 60-70 % of initial PCE can be retained after being stored in air with 10-20 % humidity for 45 days.
authors: Department of Materials Science and Engineering, Department of Chemistry, University of Washington, Seattle, WA, 98195, USA.
authors: Zonglong
authors: Z
authors: Zhu
authors: Department of Materials Science and Engineering, Department of Chemistry, University of Washington, Seattle, WA, 98195, USA.
authors: Chu-Chen
authors: CC
authors: Chueh
authors: Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
authors: Guangye
authors: G
authors: Zhang
authors: Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou, 510640, P.R. China.
authors: Fei
authors: F
authors: Huang
authors: Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong. hyan@ust.hk.
authors: He
authors: H
authors: Yan
authors: Department of Materials Science and Engineering, Department of Chemistry, University of Washington, Seattle, WA, 98195, USA. ajen@u.washington.edu.
authors: Alex K-Y
authors: AK
authors: Jen
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D004355:Drug Stability; D011211:Electric Power Supplies; D004579:Electron Transport; D010087:Oxides / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012993:Solar Energy; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D010087:Oxides; D011108:Polymers; C059910:perovskite; D014025:Titanium
keywords: electron-transport layer; n-type polymer; perovskite; solar cells; stability