Meng Xiangyue

Fullerene derivatives as acceptors for polymer solar cells

Polymer solar cells (PSCs) have drawn broad attention because of their advantages of low cost, light weight, and flexibility. Tremendous progress has been made on polymer solar cells to achieve high power conversion efficiency (PCE), and PCE of PSCs has already reached to 8%. The fullerene derivative is used as the excellent electron acceptor for PSCs, and the development of highly efficient fullerene acceptors has become the hot research field in recent years. In this paper, we reviewed the recent research progress on several types of fullerene derivative acceptors and heir relevant photovoltaic device properties, which could afford some reference for the development of high performance fullerene derivative acceptors.

Sedimentation process of saturated sand under impact loading

The initial small inhomogeneity of saturated sand could be amplified during the sedimentation process after liquefaction, and cracks could be observed in the sand column. Layers of fine sand could also be found at the exact place where cracks developed and disappeared. The phenomena and the whole process were experimentally shown by X-rays images. To account for the phenomena, a linearized stability analysis of the sedimentation of saturated sand was conducted; however, it did not produce a satisfactory result. A three-phase flow model describing the transportation of fine sand is presented in this paper. It is shown that such a kind of erosion/deposition model was qualitatively in good agreement with the experimental observation.