College of Science, Shenyang Agricultural University, Shenyang 110866, People's Republic of China.
Key Laboratory of Zoonosis of Liaoning Province, School of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, People's Republic of China.
J Colloid Interface Sci. 2018 Jan 1;509:171-177. doi: 10.1016/j.jcis.2017.09.010. Epub 2017 Sep 7.
A low-temperature, solution-processed molybdenum oxide (MoO) layer and a facile method for polymer solar cells (PSCs) is developed. The PSCs based on a MoO layer as the hole extraction layer (HEL) is a significant advance for achieving higher photovoltaic performance, especially under weaker light illumination intensity. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) measurements show that the (NH)MoO molecule decomposes and forms the molybdenum oxide (MoO) molecule when undergoing thermal annealing treatment. In this study, PSCs with the MoO layer as the HEL exhibited better photovoltaic performance, especially under weak light illumination intensity (from 100 to 10mWcm) compared to poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)-based PSCs. Analysis of the current density-voltage (J-V) characteristics at various light intensities provides information on the different recombination mechanisms in the PSCs with a MoO and PEDOT:PSS layer as the HEL. That the slopes of the open-circuit voltage (V) versus light illumination intensity plots are close to 1 unity (kT/q) reveals that bimolecular recombination is the dominant and weaker monomolecular recombination mechanism in open-circuit conditions. That the slopes of the short-circuit current density (J) versus light illumination intensity plots are close to 1 reveals that the effective charge carrier transport and collection mechanism of the MoO/indium tin oxide (ITO) anode is the weaker bimolecular recombination in short-circuit conditions. Our results indicate that MoO is an alternative candidate for high-performance PSCs, especially under weak light illumination intensity.
开发了一种低温溶液处理的氧化钼（MoO）层和一种用于聚合物太阳能电池（PSC）的简便方法。基于 MoO 层作为空穴萃取层（HEL）的 PSC 是实现更高光伏性能的重大进展，特别是在较弱的光照明强度下。傅里叶变换红外光谱（FTIR）和 X 射线光电子能谱（XPS）测量表明，（NH）MoO 分子在经历热退火处理时分解并形成氧化钼（MoO）分子。在这项研究中，与基于聚（3,4-亚乙基二氧噻吩）：聚苯乙烯磺酸盐（PEDOT：PSS）的 PSC 相比，具有 MoO 层作为 HEL 的 PSC 表现出更好的光伏性能，特别是在较弱的光照明强度（从 100 到 10mWcm）下。在各种光强度下分析电流密度-电压（J-V）特性提供了有关具有 MoO 和 PEDOT：PSS 层作为 HEL 的 PSC 中不同复合机制的信息。开路电压（V）与光照明强度图的斜率接近 1 个单位（kT/q）表明双分子复合是开路条件下的主要和较弱的单分子复合机制。短路电流密度（J）与光照明强度图的斜率接近 1 表明 MoO/氧化铟锡（ITO）阳极的有效电荷载流子输运和收集机制在短路条件下是较弱的双分子复合。我们的结果表明，MoO 是高性能 PSC 的替代候选材料，特别是在较弱的光照明强度下。
