Recently, the group of Zhou Huiqiong of the National Nanoscience Center of the Chinese Academy of Sciences used WOx nanoparticles and commercial PEDOT: PSS emulsion as a hole transport layer material for organic solar cells, which improved the surface free energy of the hole transport layer and optimized the activity The morphology of the layer improves the efficiency and fill factor of the device at the same time, and provides a simple and convenient method for modifying the hole transport layer for high-efficiency organic non-fullerene solar cells. The research was published in the journal Advanced Materials (2018, 1801801) under the title of A Highly Effcient Non-Fullerene Organic Solar Cell with a Fill Factor over 0.80 Enabled by a Fine-Tuned Hole-Transporting Layer.
In recent years, organic solar cells have received much attention because of their broad application prospects. The fill factor is an important photovoltaic performance parameter in organic solar cells, mainly affected by the properties of the interface layer and the active layer.
Zhou Huiqiong's group mixed WOx nano ions with PEDOT: PSS emulsion and optimized the composition and film thickness of the hole transport layer of WOx: PEDOT: PSS based on non-fullerene based on PBDB-TF: IT-4F bulk heterojunction The solar cell achieved a fill factor (FF) of 80.79% and a conversion efficiency of 14.57% (the verification efficiency of the Chinese Metrology Institute is 14.15%). Impedance analysis and transient photocurrent photovoltage test characterization revealed that the WOx: PEDOT: PSS hole transport layer has better charge extraction performance than the widely used PEDOT: PSS thin film. AFM and RSoXS tests found that hole transport layers with different surface free energies (WOx, WOx: PEDOT: PSS, PEDOT: PSS) can regulate the morphology of bulk heterojunctions. By comparing the phase area size / purity, carrier lifetime, exciton dissociation performance and carrier transport mobility, the researchers believe that WOx: PEDOT: PSS devices have high FF derived from more balanced carrier transport, more Long carrier lifetime and weakened non-radiative charge recombination.
The first author of this article is Assistant Researcher Zheng Zhong, who is the pre-research work of Zhou Huiqiong's group (Nano Energy, 2018, 50, 169-175; J. Mater. Chem. C., 2018, DOI: 10.1039 / C8TC02933D; RSC Advances, 2017, 7, 12400-12406), with Hou Jianhui's research group (material synthesis) of the Institute of Chemistry, Chinese Academy of Sciences, Liu Feng's research group (topography) of Shanghai Jiaotong University and Zhang Yuan's research group of Beijing University of Aeronautics and Astronautics ( Device physics) the result of joint cooperation. The research work was supported by projects such as the Hundred Talents Program of the Chinese Academy of Sciences and the National Natural Science Foundation of China.
Schematic diagram of device structure and device performance of organic solar cells
D-rings offer another alternative Seal solution to O-rings for use in reciprocating dynamic or rotary applications. They offer the same sealing characteristics as an O-ring and can be used in both low and high pressure application across a broad range of temperatures.
D-rings can typically be retrofitted into existing O-ring grooves with the size often based around the original O-ring size. The flat geometry on the base of the D-ring stops the seal from twisting and rolling, preventing spiral failure often seen when O-rings are used in reciprocating applications. D-rings can be manufactured to standard O-ring sizes, as well as custom sizes for specific applications.
D Rings Seal,D Shaped O Ring,D Shaped O Rings,D Stops Rubber O Rings
Shenyang Guide Rubber Products Co.,Ltd , https://www.guiderubber.com