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5 Mar 2012

Volume 100, Issue 10, Articles (10xxxx)

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Appl. Phys. Lett. 100, 101903 (2012); http://dx.doi.org/10.1063/1.3673327 (3 pages)

Michael Ian Lapsley, Anaram Shahravan, Qingzhen Hao, Bala Krishna Juluri, Stephen Giardinelli, Mengqian Lu, Yanhui Zhao, I-Kao Chiang, Themis Matsoukas, and Tony Jun Huang
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Electron drift-mobility measurements in polycrystalline CuIn1−xGaxSe2 solar cells

S. A. Dinca, E. A. Schiff, W. N. Shafarman, B. Egaas, R. Noufi, and D. L. Young

Appl. Phys. Lett. 100, 103901 (2012); http://dx.doi.org/10.1063/1.3692165 (3 pages)

Online Publication Date: 7 March 2012

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We report photocarrier time-of-flight measurements of electron drift mobilities for the p-type CuIn1−xGaxSe2 films incorporated in solar cells. The electron mobilities range from 0.02 to 0.05 cm2/Vs and are weakly temperature-dependent from 100–300 K. These values are lower than the range of electron Hall mobilities (2-1100 cm2/Vs) reported for n-type polycrystalline thin films and single crystals. We propose that the electron drift mobilities are properties of disorder-induced mobility edges and discuss how this disorder could increase cell efficiencies.
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88.40.jn Thin film Cu-based I-III-VI2 solar cells
88.40.hj Efficiency and performance of solar cells

Nanostructured all-solid-state supercapacitor based on Li2S-P2S5 glass-ceramic electrolyte

Brian E. Francisco, Christina M. Jones, Se-Hee Lee, and Conrad R. Stoldt

Appl. Phys. Lett. 100, 103902 (2012); http://dx.doi.org/10.1063/1.3693521 (4 pages)

Online Publication Date: 9 March 2012

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While today’s lithium-ion batteries offer acceptable energy storage capability, they lack the ability to be cycled repeatedly more than a couple thousand times. Electrochemical capacitors, i.e., supercapacitors, are being developed whose lifetimes exceed 1 × 106 cycles and power densities surpass those of batteries by several times. Here, we present an all-solid-state supercapacitor using a Li2S-P2S5 glass-ceramic electrolyte as both separator and ion conductor. Three device architectures are examined including two with nanostructured electrodes which incorporate multi-walled carbon nanotubes (MWCNTs). Cyclic voltammograms and electrochemical impedance measurements demonstrate that these devices develop reversible double layer capacitance, and a maximum of 7.75 F/g is achieved in the device constructed by mechanically mixing the nanostructured electrodes. Electrochemical impedance spectroscopy explains non-idealities observed when MWCNTs are incorporated in the electrode layers.
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82.47.Uv Electrochemical capacitors; supercapacitors
84.32.Tt Capacitors
88.80.fh Supercapacitors
82.45.Gj Electrolytes
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