Research Center for Sustainable Energy and Technology

Kanazawa-shi, Japan

Research Center for Sustainable Energy and Technology

Kanazawa-shi, Japan
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Kuwabara T.,Research Center for Sustainable Energy and Technology | Kuwabara T.,Kanazawa University | Taima T.,Research Center for Sustainable Energy and Technology | Taima T.,Kanazawa University | Takahashi K.,Research Center for Sustainable Energy and Technology
Electrochemistry | Year: 2017

We present a novel insight on the light-soaking effect, in which the open-circuit voltage (Voc) of inverted polymer solar cells improves with increase in light irradiation time. We previously have found that there are two kinds of the light soaking effects such as a short-circuit current density dependent type and a Voc dependent type. The expression of these effects needed to irradiate the light containing UV component. However, for 4-(triphenylphos-phonio)butane-1-sulfonate (TPPBS)-modified indium tin oxide (ITO)/poly(3-hexylthiophene-2,5-diyl) (P3HT): [6,6]-phenyl-C61-butyric acid methyl ester (PCBM)/poly(3,4-ethylenedioxylenethiophene):poly(4-styrene sulfonic acid) (PEDOT:PSS)/Au inverted cell, we first observed an increase in the Voc by irradiating white light not containing UV component. After pre-treatment by applying forward bias under UV-cut light, the Voc was improved even when the performance was evaluated by irradiating UV-cut light, that is, the Voc values of 0.36, 0.42, 0.46 and 0.54V were obtained by holding at forward voltages of 0, 0.3, 0.6, and 1.0V, respectively. We discussed about this pre-treatment effect from the viewpoint of desorption of oxygen molecules adsorbing on ITO. © The Electrochemical Society of Japan, All rights reserved.

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