Naphthalene-Diimide-Based Ionenes as Universal Interlayers for Efficient Organic Solar Cells |
| |
| Authors: | Ming Liu Pu Fan Dr Qin Hu Prof Thomas P Russell Prof Yao Liu |
| |
| Institution: | 1. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029 China;2. Polymer Science and Engineering Department, University of Massachusetts Amherst, 120 Governors Drive, Amherst, MA, 01003 USA;3. Polymer Science and Engineering Department, University of Massachusetts Amherst, 120 Governors Drive, Amherst, MA, 01003 USA
Materials Sciences Division, Lawrence Berkeley National Lab, 1 Cyclotron Road, Berkeley, CA, 94720 USA |
| |
| Abstract: | Self-doping ionene polymers were efficiently synthesized by reacting functional naphthalene diimide (NDI) with 1,3-dibromopropane ( NDI-NI ) or trans-1,4-dibromo-2-butene ( NDI-CI ) via quaternization polymerization. These NDI-based ionene polymers are universal interlayers with random molecular orientation, boosting the efficiencies of fullerene-based, non-fullerene-based, and ternary organic solar cells (OSCs) over a wide range of interlayer thicknesses, with a maximum efficiency of 16.9 %. NDI-NI showed a higher interfacial dipole (Δ), conductivity, and electron mobility than NDI-CI , affording solar cells with higher efficiencies. These polymers proved to efficiently lower the work function (WF) of air-stable metals and optimize the contact between metal electrode and organic semiconductor, highlighting their power to overcome energy barriers of electron injection and extraction processes for efficient organic electronics. |
| |
| Keywords: | interface engineering interfacial dipoles ionene polymers organic semiconductors organic solar cells |
|
|
