提交时间： 2017-05-02
Deng, FL [Deng, Fuling][ 1,2 ]
Cao, HT [Cao, Hongtao][ 2 ]
Liang, LY [Liang, Lingyan][ 2 ]
Li, J [Li, Jun][ 2 ]
Gao, JH [Gao, Junhua][ 2 ]
Zhang, HL [Zhang, Hongliang][ 2 ]
Qin, RF [Qin, Ruifeng][ 2 ]
Liu, CC [Liu, Caichi][ 1 ]
摘要： Polycrystalline ZnSnN2 thin films were successfully prepared by DC magnetron sputtering at room temperature. Both the as-deposited and annealed films showed n-type conduction, with electron concentration varying between 1.6 x 10[18] and 2.3 x 10[17] cm[-3
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Li, PD [Li, Pandeng][ 1,2 ]
Li, XF [Li, Xiaofang][ 1 ]
Sun, CM [Sun, Chunming][ 2 ]
Wang, GJ [Wang, Guojie][ 2 ]
Li, J [Li, Jun][ 2 ]
Jiu, TG [Jiu, Tonggang][ 2 ]
Fang, JF [Fang, Junfeng][ 2 ]
摘要： In this paper, we reported that ZnO nanoparticles (NPs) film modified with C60 pyrrolidine tris-acid ethyl ester (PyC60) was used as cathode buffer layer in inverted polymer solar cells. The resultant device with a blend of PTB7:PC71BM as photoactive materials exhibited an open-circuit voltage (Voc) of 0.753 V, a short-circuit current (Jsc) of 16.04 mA cm 2, a fill factor (FF) of 72.5%, and an overall power conversion efficiency (PCE) of 8.76%. It was higher than the control devices based on sole ZnO NPs film or ZnO: PyC60 hybrid film as cathode buffer layer. It was found that the morphology improvement of ZnO/PyC60 film contributed to reducing series loss and interfacial charge recombination. In addition, it improved the interfacial contact with photoactive layer. The results increased electron injection and collection efficiency, and improved FF.
分类： 物理学 >> 普通物理:统计和量子力学,量子信息等 提交时间： 2017-05-02
Zhang, CX [Zhang, Caixia][ 1,2 ]
Chen, ZL [Chen, Zhenlian][ 2 ]
Zeng, YZ [Zeng, Yongzhi][ 1 ]
Zhang, ZF [Zhang, Zhifeng][ 2 ]
Li, J [Li, Jun][ 2 ]
摘要： First-principles calculations combined with XRD simulations are performed to systematically study crystal structures, bonding characteristics and electronic structures of LixCoSiO4 (x = 2.0, 1.5, 1.0) polymorphs with symmetries Pmn21-DP and Pbn21. The calculated average voltages by lithium extraction agree well with available experiments. CoO4 tetrahedron is the key structural unit to track the process of delithiation. The oxidation of CoO4 tetrahedron results in a special pattern of bonding characteristic, which corresponds to spin ordering and may be observable in XRD spectra according to simulation. We find delithiated phases are intrinsic Mott insulators, electronic band gaps change from Mott− Hubbard-type to charge-transfer-type during lithium removing. The swapping of near-gap states is associated with the contraction of the oxidized CoO4 units, indicating Peierls distortions that may be the physical origin of capacity degrading of Co−silicate chemistry.
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