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Device fabrication sequence of P3HT:PCBM polymer solar cells using the double stamp transfer printing technique.
X-ray photoelectron spectra of P3HT:PCBM film spin coated (control device) and double stamp transfer printed (printed device) on an ITO/MoO3 coated glass substrate. The O1s peak intensity at 531 eV is considerably higher in the stamp-transferred film compared to the spin-coated film, indicating that the relative content of PCBM at the interface with the cathode is increased for the stamp transfer printed film.
Contact angle measurements of P3HT:PCBM film spin coated and double stamp transfer printed on a ITO/MoO3 substrate, using water was the probing solvent. Vertical red bars are tangent to the contact angle. The scale bar indicates 1 mm.
Time of flight secondary ion mass spectrometry depth profiles of the S- ion (characteristic of P3HT) of spin coated and double stamp transfer printed P3HT:PCBM active layers versus the distance from P3HT:PCBM/Al interface.
Current density-voltage curves of spin coated (control device) and double stamp transfer printed (printed device) devices under (a) dark and (b) AM 1.5G, 1 sun illumination. Note that the dark current of the printed devices is decreased compared to the control due to efficient electron and hole blocking resulting from the concentration gradient achieved by printing. Similarly, the photocurrent of the printed devices is increased.
External quantum efficiency vs. wavelength of spin coated (control device) and double stamp transfer printed (printed device) devices indicating the improved charge collection efficiency of the latter structure.
Performance characteristics of P3HT:PCBM polymer solar cells.
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