Kim Junghwan, Kim Heejoo, Kim Geunjin, Back Hyungcheol, Lee Kwanghee
Department of Nanobio Materials and Electronics, ‡Heeger Center for Advanced Materials & Research Institute for Solar and Sustainable Energies, §School of Materials Science and Engineering, Gwangju Institute of Science and Technology , Gwangju 500-712, Republic of Korea.
ACS Appl Mater Interfaces. 2014 Jan 22;6(2):951-7. doi: 10.1021/am404353y. Epub 2014 Jan 6.
We report a new method for developing a low-temperature solution processed vanadium oxide (s-VOx) and poly(4-styrene sulfonic acid) (PSS) composite to act as an efficient hole-transport layer (HTL) in polymer solar cells (PSCs). By compositing the s-VOx and PSS (s-VOx:PSS), the work function values of the s-VOx:PSS changed from 5.0 to 5.3 eV. Therefore, the energy level barrier between the HTL and organic active layer decreased, facilitating charge injection/extraction at the interfaces. In addition, the s-VOx:PSS films were denser and had more pin-hole-free surfaces than pristine s-VOx films, resulting in enhanced PSC performance due to significantly decreased leakage currents and excellent device stability in ambient condition. Because our approach of combining soluble transition metal oxide (TMO) and polymeric acid shows dramatically better performance than pristine TMO, we expect that it can provide useful guidelines for the synthesis and application of TMOs for organic electronics in the future.
我们报道了一种开发低温溶液处理的氧化钒（s-VOx）与聚（4-苯乙烯磺酸）（PSS）复合材料的新方法，该复合材料可作为聚合物太阳能电池（PSC）中的高效空穴传输层（HTL）。通过将s-VOx与PSS复合（s-VOx:PSS），s-VOx:PSS的功函数值从5.0 eV变为5.3 eV。因此，HTL与有机活性层之间的能级势垒降低，促进了界面处的电荷注入/提取。此外，s-VOx:PSS薄膜比原始s-VOx薄膜更致密，表面无更多针孔，由于泄漏电流显著降低以及在环境条件下具有出色的器件稳定性，从而提高了PSC的性能。由于我们将可溶性过渡金属氧化物（TMO）与聚合酸相结合的方法表现出比原始TMO显著更好的性能，我们预计它可为未来有机电子学中TMO的合成和应用提供有用的指导。
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