[10a-Z11-1~11] 12.5 Organic solar cells

[10a-Z11-10] Precise Functionalization of Perylene Diimide for Reduction of Open-Circuit Voltage Loss in Organic Photovoltaics

〇Seiichiro Izawa^1,2, Keisuke Fujimoto³, Masaki Takahashi³, Masahiro Hiramoto^1,2 (1.IMS, 2.SOKENDAI, 3.Shizuoka Univ.)

Keywords:Organic Solar Cell, Charge recombination, Electron acceptor

Perylene diimide (PDI), a promising candidate as a superior non-fullerene acceptor for an organic photovoltaic, has attracted tremendous attention due to the highly efficient charge-carrier properties as well as high thermal and chemical stabilities. In this work, the regioselective bromination has been expanded into efficient preparation of multiply bay-functionalized PDI by electron-donating groups. Owing to the high solubility and the lifted LUMO level as a result of the bay-functionalization, the obtained PDI gave significant advantages as an acceptor material for photovoltaic application. A solution-processed organic solar cell exhibited remarkably high open-circuit voltage (V_OC) reaching 1.00 V and power conversion efficiency of 1.74%. The observed high V_OC could be understood by reduction of energy offset for charge separation and non-radiative recombination.