Enhanced performance of inverted polymer solar cells with ITO interfacial tuning via water-soluble polyfluorenes
- Enhanced performance of inverted polymer solar cells with ITO interfacial tuning via water-soluble polyfluorenes
- 나석인; 김태수; 오승환; 김준경; 김석순; 김동유
- Issue Date
- Materials Research Society (MRS)
- Enhanced performance of inverted organic solar cells (PSCs) is demonstrated by indium tin oxide (ITO) interfacial tuning via a water-soluble polyfluorene (WPF-6-oxy-F). The effects of the WPF-6-oxy-F layer as the ITO interfacial modifier on inverted PSCs, based on poly(3-hexylthiophene) (P3HT) and 1-(3-methoxycarbonyl)-propyl-1-phenyl-(6,6)C61 (PCBM), were investigated. Kelvin probe studies demonstrated that the WPF-6-oxy-F layer reduces the ITO work-function because of the relatively strong interfacial dipole of WPF-6-oxy-F. In addition, the dark current-voltage curves of inverted PSCs with the WPF-6-oxy-F layer showed smaller leakage current and better charge transport. As a result, introduction of the WPF-6-oxy-F by simple solution processing into the inverted PSCs dramatically raised open-circuit voltage to 0.65 V, fill factor to 59 %, and power conversion efficiency to 3.56 %, approaching the original values of P3HT:PCBM based PSCs with the normal structure. More detailed studies on the relationship between performance of inverted PSCs and various conditions such as heat treatment, thickness and work-function were also investigated.
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