1. High efficiency inverted organic solar cells with photo annealing titanium oxide films as electron extract layer.
- Author
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Liu, Zhiyong and Wang, Hong-En
- Subjects
- *
TITANIUM dioxide films , *SOLAR cells , *PHOTOELECTRON spectroscopy , *X-ray photoelectron spectroscopy , *ULTRAVIOLET spectroscopy - Abstract
Photo-annealing treatment has successfully been demonstrated in organic solar cells (OSCs) with solution-processable titanium (diisopropoxide) bis(2,4-pentanedionate) (TIPD) as an electron extraction layer; this process was shown without thermal annealing treatment. The power conversion efficiency (PCE) is quite low in the initial stage, though it dramatically increases following constant light illumination and reaches a saturated state after 9 min of light illumination. X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) and ultraviolet photoemission spectroscopy (UPS) were used, and they showed that the TIPD molecules decomposed and formed stable Ti O bonds. According to photocurrent density-effective voltage curve (J ph - V eff), short-circuit current density (J SC) and open-circuit voltage (V OC) value under different light intensity, the photo-annealed TIPD-based OSCs showed efficient charge transport and suppressed charge recombination. Thus, after a fresh TIPD solution was spin-coated onto the indium tin oxide (ITO) surface and photo-annealed for 9 min, the OSCs showed the highest photovoltaic performance compared to ZnO-based OSCs. [Display omitted] [ABSTRACT FROM AUTHOR]
- Published
- 2022
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