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Imbalanced charge mobility in oxygen treated polythiophene/fullerene based bulk heterojunction solar cells
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Figures

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FIG. 1.

PhotoCELIV transients for the (a) control device without oxygen treatment and (b) 1 h exposure to oxygen.

Image of FIG. 2.

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FIG. 2.

Variation in charge mobility with applied electric field for the devices with and without oxygen/air exposure.

Image of FIG. 3.

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FIG. 3.

(a) characteristics of the solar cells treated with different oxygen/air exposures; (b) the behavior of normalized PCE as a function of operation time for a set of identical solar cells that were exposed to different oxygen/air exposure conditions.

Tables

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Table I.

The photovoltaic parameters measured for the solar cells that were treated with different oxygen/air exposures.

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/content/aip/journal/apl/95/26/10.1063/1.3279135
2009-12-29
2014-04-21

Abstract

The effect of oxygen induced traps on charge mobility in bulk heterojunctionsolar cells using poly(3-hexylthiophene) (P3HT):l-(3-methoxycarbonyl)-propyl-l-phenyl-(6, 6) methanofullerene (PCBM) blend have been studied using photoinduced charge extraction by linearly increasing voltage (PhotoCELIV) technique. The solar cells exposed to oxygen exhibit dual PhotoCELIV peaks, whereas the solar cell without oxygen treatment show single PhotoCELIV peak with the charge mobility of the order of . It is demonstrated that the oxygen treatment imbalance the charge mobility in the P3HT/PCBM photoactive layer, which affects the power conversion efficiency and lifetime of the solar cell. The single PhotoCELIV peak for the device without oxygen treatment indicates that the charge mobility is balanced, that causes the overlapping of electron and hole transients.

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Scitation: Imbalanced charge mobility in oxygen treated polythiophene/fullerene based bulk heterojunction solar cells
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/26/10.1063/1.3279135
10.1063/1.3279135
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