Elsayed M.HJiang B.-HWang Y.-PChang P.-YChiu Y.-CJeng R.-JChou H.-HChen C.-P.RU-JONG JENG2021-08-052021-08-05202120507488https://www.scopus.com/inward/record.uri?eid=2-s2.0-85104545869&doi=10.1039%2fd1ta00796c&partnerID=40&md5=cc5a0d5add1bf78439392b3b24339df6https://scholars.lib.ntu.edu.tw/handle/123456789/577196In this paper we describe three indacenodithiophene-based conjugated polymers (PITIC-Ph, PITIC-Th, and PITIC-ThF) that we tested as third components for PM6:Y6-based ternary organic photovoltaics (OPVs) to provide high-power conversion efficiencies (PCEs) and long-term thermal stabilities. Among them, the incorporation of PITIC-Ph enhanced the charge dissociation and prohibited the bimolecular (trap-assisted) recombination of the PM6:Y6 blend. Compared with the pre-optimized OPV device, the PCEs of the PITIC-Ph-doped devices improved from 15.0 ± 0.37 to 17.0 ± 0.35% under AM 1.5 G (100 mW cm?2) irradiation. More critically, studies of the thermal stability revealed another phenomenon: embedding PITIC-Ph decreased the degree of thermally driven phase segregation of the PM6:Y6 blend film. The respective OPVs exhibited outstanding thermal stability under stress at 150 °C within a glove box, with the PCE of the PITIC-Ph-doped device remaining high (at 16.4%) after annealing for 560 h. ? The Royal Society of Chemistry 2021.Thermodynamic stability; Based conjugated polymers; Doped devices; High power conversion; Organic photovoltaics; Phase segregations; Thermally driven; Thermally stable; Third component; Conjugated polymers[SDGs]SDG7Thermodynamic stability; Based conjugated polymers; Doped devices; High power conversion; Organic photovoltaics; Phase segregations; Thermally driven; Thermally stable; Third component; Conjugated polymersjournal article10.1039/d1ta00796c2-s2.0-85104545869