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Li Y.,Tianjin University of Technology | Li Y.,Tianjin Key Laboratory for Photoelectric Materials Devices | Zhang W.,Tianjin University of Technology | Yang L.,Tianjin University | And 2 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2012

The process and forming performance of laser tailor-welded board (TWB) of 6061 aluminum alloy were studied. The forming characteristics of TWB in the cup axon trials and the influence of welded beam on overall plastic forming of tailor-welded plate were analyzed. The cupping test results of laser TWB shows that the cracking generally appears in the narrow HAZ. The cupping index of TWB was slightly lower than that of base metal. During the numerical simulation process of cupping test with DYNAFORM software, only the location of the welded beam was considered but its type was ignored, and the results showed that the simulation cracking of the TWB easily occurred at the welded seam below the cupping head with the influence of the welded seam, and the simulation results were slightly different from the practical tests, which was possibly related to the set of the welded seam. Source

Qin W.,Tianjin University of Technology | Qin W.,Tianjin Key Laboratory for Photoelectric Materials Devices | Xu X.,Tianjin University of Technology | Xu X.,Tianjin Key Laboratory for Photoelectric Materials Devices | And 11 more authors.
Journal of Renewable and Sustainable Energy | Year: 2013

ZnO is a promising material used as the electron transport layer in the inverted organic solar cells (IOSCs). However, the electrical or photoelectric properties of ZnO nanoparticles are governed by the surface states of the nanoparticles. Here, we demonstrate that the large number of hydroxyl (-OH) existed on the ZnO nanoparticles films have a vast impact on the performance of IOSCs with the structure of ITO/ZnO/poly(3-hexylthiophene) (P3HT):[6,6]-phenyl C61 butyric acid methyl ester (PCBM)/MoO3/Ag. The surface hydroxyl groups depredate active layer via elevating photocatalytic activity of the ZnO, hence deteriorate the device performance. Experimental results show that hydroxyl groups can be effectively detached from ZnO film by annealing. Hydroxyl groups detach more with increasing annealing temperature, resulting in less degradation of the active layer. Therefore, the efficiency is significantly improved due to increased photo-current density and decreased series resistance of IOSCs. The best device exhibits a power conversion efficiency of 3.05% after annealing at 150°C. © 2013 AIP Publishing LLC. Source

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