Recently, Zhou Huiqiong, a national nanoscience center of the Chinese Academy of Sciences, mixed WOx nanoparticles with a commercial PEDOT:PSS emulsion as a hole transport layer material for organic solar cells, improving the surface free energy of the hole transport layer and optimizing the activity. The morphology of the layer, which simultaneously increases the efficiency and fill factor of the device, provides a simple and easy method for modifying the hole transport layer for highly efficient organic non-fullerene solar cells. The study uses A Highly Effcient Non-Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine-Tuned Hole-Transporting Layer was published in Advanced Materials, 2018, 1801801.
In recent years, organic solar cells have attracted much attention due to their broad application prospects. Filling factor is an important photovoltaic performance parameter in organic solar cells, which is mainly affected by the properties of interface layer and active layer.
Zhou Huiqiong's group mixed WOx nano-ion with PEDOT:PSS emulsion, and refined the composition and film thickness of WOx:PEDOT:PSS hole transport layer, based on PBDB-TF:IT-4F heterojunction non-fullerene The solar cell achieved 80.79% fill factor (FF) and 14.57% conversion efficiency (China Metrology Institute verification efficiency was 14.15%). Characterization of impedance analysis and transient photocurrent photovoltage test revealed PEDOT:PSS relative to wide application. Thin film, WOx: PEDOT: PSS hole transport layer has superior charge extraction performance. AFM and RSoXS tests found that hole transport layers with different surface free energy (WOx, WOx: PEDOT: PSS, PEDOT: PSS) can regulate the body The morphology of the heterojunction layer. By comparing the phase size/purity, carrier lifetime, exciton dissociation performance and carrier transport mobility, the researchers believe that the WOx: PEDOT:PSS device has a high FF source. Balanced carrier transport, longer carrier lifetime and weaker non-radiative charge recombination.
The first author of this article is assistant researcher Zheng Zhong, who is the former research work of Zhou Huiqiong's research group (Nano Energy, 2018, 50, 169-175; J. Mater. Chem. C., 2018, DOI: 10.1039/C8TC02933D; RSC Further expansion of Advances, 2017, 7, 12400-12406), with Hou Jianhui's research group of the Institute of Chemistry of the Chinese Academy of Sciences (material synthesis), Liu Wei's research group (morphological representation) of Shanghai Jiaotong University, and Zhang Yuan's group of Beijing University of Aeronautics and Astronautics ( Device Physics) The result of joint cooperation. The research work was supported by the Chinese Academy of Sciences Hundred Talents Program and the National Natural Science Foundation.
Device structure diagram and device performance of organic solar cells
