Gehan Timothy S, Ellis Christie L C, Venkataraman Dhandapani, Bag Monojit
Advanced Laboratory for Iontronic, Electronic and Nanomaterials, Department of Chemistry , University of Massachusetts , Amherst 01003 , United States.
Advanced Research in Electrochemical Impedance Spectroscopy, Department of Physics , Indian Institute of Technology Roorkee , Roorkee 247667 , India.
ACS Appl Mater Interfaces. 2020 Feb 19;12(7):8183-8188. doi: 10.1021/acsami.9b19781. Epub 2020 Feb 10.
Organic-nanoparticle-based solar cells have drawn great attention due to their eco-friendly and environmentally friendly fabrication procedure. However, these surfactant-stabilized nanoparticles suffer open-circuit voltage loss due to charge trapping and poor extraction rate at the polymer cathode interface. Here, we have investigated the origin of voltage loss and charge trapping in surfactant-stabilized nanoparticle-based devices. Efficient organic photovoltaic (OPV) devices have been fabricated from an aqueous dispersion of poly(3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-phenyl-C-butyric acid methyl ester (PCBM) nanoparticles stabilized by anionic surfactants. AC impedance spectroscopy has been used to understand the charge transport properties in the dark and in operando conditions. We have demonstrated the similarities in the charge transport properties, as well as photocarrier dynamics of the nanoparticle-based OPVs and the bulk heterojunction OPVs despite fundamental differences in their nanostructure morphology. This study emphasizes the possibility of fabricating highly efficient OPVs from organic nanoparticles by reducing surface defects and excess doping of the polymers.
基于有机纳米粒子的太阳能电池因其环保的制造工艺而备受关注。然而，这些由表面活性剂稳定的纳米粒子在聚合物阴极界面处由于电荷俘获和较差的提取率而存在开路电压损失。在此，我们研究了基于表面活性剂稳定纳米粒子的器件中电压损失和电荷俘获的起源。通过由阴离子表面活性剂稳定的聚（3-己基噻吩-2,5-二亚基）（P3HT）和[6,6]-苯基-C-丁酸甲酯（PCBM）纳米粒子的水分散体制备了高效有机光伏（OPV）器件。交流阻抗谱已被用于了解黑暗中和工作条件下的电荷传输特性。尽管基于纳米粒子的OPV和本体异质结OPV在纳米结构形态上存在根本差异，但我们已经证明了它们在电荷传输特性以及光载流子动力学方面的相似性。这项研究强调了通过减少聚合物的表面缺陷和过量掺杂由有机纳米粒子制造高效OPV的可能性。
