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DSC thermogram of the P3HT powder used in this work. The inset box shows the onset on an expanded scale. Also shown (inset) are the chemical structures of P3HT (a) and PCBM (b), the organic solar cell structure (c), and the expected energy band diagram (d). Here, and denote the PEDOT:PSS layer and the blend film of P3HT and PCBM, respectively.
characteristics (AM 1.5, ) of the CB (top) and DCB (bottom) devices: (a) As-fabricated device, (b) annealed at 140 °C for 4 min in air, and (c) annealed at 230 °C for 4 min in air.
Jsc (squares in top panel), FF (circles in top panel), Voc (squares in bottom panel), and PCE (circles in bottom panel) as a function of annealing temperature for the CB (filled symbols) and DCB (open symbols) devices annealed for 4 min in air.
characteristics (AM 1.5, ) and EQE spectra (inset) of the CB (a) and DCB (b) devices: Solid lines denote the as-fabricated devices with the blend films softbaked at 50 °C for 15 min, while dashed lines stand for the devices annealed at 140 °C for 15 min (CB) and 30 min (DCB) in a nitrogen environment.
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