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17 Sep 2012

Volume 101, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 101, 123901 (2012); http://dx.doi.org/10.1063/1.4751469 (4 pages)

Chin-An Lin, K. P. Huang, S. T. Ho, Mei-Wen Huang, and Jr-Hau He
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Ambipolar charge transport in polymer:fullerene bulk heterojunctions for different polymer side-chains

S. Fall, L. Biniek, N. Leclerc, P. Lévêque, and T. Heiser

Appl. Phys. Lett. 101, 123301 (2012); http://dx.doi.org/10.1063/1.4754590 (4 pages) | Cited 1 time

Online Publication Date: 19 September 2012

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We use field-effect transistors to investigate electron and hole mobilities in polymer:fullerene blends. Low-band-gap polymers with a common conjugated backbone and differing side-chains are utilized in order to clarify the link between the side-chain molecular structure and grafting position, and the power-conversion efficiency of related bulk heterojunction solar cells. The results show that, at a fixed polymer:fullerene weight ratio, the electron mobility increases by more than four orders of magnitude when changing from linear to branched side-chains. As a consequence, the photovoltaic performances are highest at low fullerene contents for branched chains while the opposite is true for linear chains.
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73.40.Qv Metal-insulator-semiconductor structures (including semiconductor-to-insulator)
88.40.hj Efficiency and performance of solar cells
88.40.jp Multijunction solar cells
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Reverse bias degradation in dye solar cells

Simone Mastroianni, Alessandro Lanuti, Thomas M. Brown, Roberto Argazzi, Stefano Caramori, Andrea Reale, and Aldo Di Carlo

Appl. Phys. Lett. 101, 123302 (2012); http://dx.doi.org/10.1063/1.4754116 (4 pages) | Cited 2 times

Online Publication Date: 19 September 2012

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A prolonged reverse bias (RB) stress forcing a short-circuit current through a dye solar cell, corresponding to the harshest test a shadowed cell may experience in real conditions, can cause the RB operating voltage VRB to drift with time, initially slowly but accelerating for VRB < (−1.65 ± 0.15)V when gas bubbles, identified as H2 (gas chromatography), are produced inside the cell, leading to breakdown. A close connection between VRB, cell performance, and stability was established. Contributions to RB degradation include triiodide depletion and impurities, in particular water. Acting upon these components and setting up protection strategies is important for delivering long-lasting modules.
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88.40.H- Solar cells (photovoltaics)
82.80.Bg Chromatography
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