Ma, Y.; Li, T.; Zhang X., and Zhang L., 2015. Research on coupling prediction of mooring line tension and motion response of vertical axis floating tidal current energy converter.In order to predict mooring line tension and motion response of vertical axis floating tidal energy converter, ANSYS ICEM and ANSYS CFX softwares are used to simulate stress of vertical axis water turbine and formulas are fitted to determine added mass and damping of rotation water turbine in wave environment. Based on ANSYS AQWA software, numerical time-domain coupled prediction method for the prediction of mooring line tension and wave effect of vertical axis floating tidal energy converter in terms of rotation of water turbine and motion response are constructed. Mooring line tension and motion response are predicted and the result is compared with the experiment result. According to the result, the predicted value of mooring line tension and motion response of vertical-axis tidal energy converter obtained by the numerical time-domain coupling prediction method in the paper corresponds with the experiment result. Feasibility and validity of the numerical time-domain coupling prediction method in the paper are confirmed. The research offers theory foundation and technical support for design and construction of vertical axis floating tidal energy converter.
Nonradiative recombination loss (qΔVocnonrad), as a large component of energy loss (Eloss), has become an important factor that limits the power conversion efficiency (PCE) of organic solar cells (OSCs). Herein, high-performance ternary OSCs based on a polymer donor PTB7-Th, a polymer donor PBDTm-T1, and a nonfullerene acceptor FOIC are reported. When blended with FOIC, the PBDTm-T1-based device yielded a smallest qΔVocnonrad of 0.197 eV, but with a moderate PCE of 3.3%. In contrast, the PTB7-Th:FOIC device exhibited a relatively higher qΔVocnonrad of 0.329 eV; however, a high PCE of 11.9% was found. This trade-off relationship has been resolved using a ternary blend. By incorporation of 20% PBDTm-T1 into the PTB7-Th:FOIC blend, a small qΔVocnonrad value of 0.271 eV and a significantly high PCE of 13.8% were simultaneously obtained. The results demonstrate that the nonradiative recombination loss can be effectively reduced by using a ternary strategy.
Suppressing trap states and localized electronic states in the forbidden gap of semiconductors as either active layers or contacts is critical to the enhancement of optoelectronic device performance, such as for solar cells, ultrafast photodetectors, field-effect transistors, as well as other optoelectronic applications. In this study, we demonstrate that Lewis bases-passivated metal oxide n-type contacts can effectively improve the performance of organic solar cells (OSCs). OSCs with triethanolamine-passivated ZnO show a two orders of magnitude lower trap density, and thus a higher electron mobility, and three times longer charge carrier recombination lifetime, relative to the devices based on as-cast ZnO. Passivated ZnO universally improves the power conversion efficiency (PCE) of OSCs based on varied active layers. P3HT:PC71BM-based solar cells with passivated-ZnO yield 86% PCE enhancement relative to the control devices based on as-cast ZnO, and PM6:Y6-based devices with passivated-ZnO exhibit PCEs up to 15.61%. Furthermore, light stability of OSCs with passivated-ZnO has also been improved along with enhanced device efficiency. A Lewis base is also efficient to passivate SnOx contact for solar cells. This study highlights the importance of defect passivation on contact layers for improvement of the efficiency and stability of OSCs and also provides one facile and effective passivation strategy.
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