Indacenodithiophene‐Based Medium‐Bandgap Guest Acceptor Enables High‐Efficiency Ternary Organic Solar Cells

• DOI: 10.1002/marc.202401005
• Publication Date: 2025-02-14T13:11:16Z
• Authors: Nailiang Qiu; Chunyan Liu; Tengteng Zhang; Jiaxuan Li; Wenhui Zhang; Jun Yan; Shiqun You; Yan Lu
• Keywords: Acceptor

The ternary organic solar cells (OSCs) have been proven to be an effective strategy for achieving high power conversion efficiency (PCE), exhibiting substantial potential continuous enhancement of device performance. In this work, a novel nonfullerene acceptor, IDT-FN, is developed utilizing renowned indacenodithiophene (IDT) core and moderately intense electron-withdrawing terminal groups, serving as the third component in OSCs. IDT-FN demonstrates excellent complementary light absorption cascaded energy levels with host materials D18 CH-6F, resulting enhanced photon harvesting charge transport within blend. Therefore, even as-cast manages surpass optimal binary device, superior PCE 17.34% compared latter's 17.08%. Through optimization, devices attain impressive 18.32%, accompanied by open-circuit voltage (Voc) 0.897 V, fill factor 0.745, short-circuit current density (Jsc) 27.41 mA cm-2. This significant success IDT-based medium-bandgap guests achieve state-of-the-art