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Programm Photovoltaik Ausgabe 2008 ... - Bundesamt für Energie BFE

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3/3<br />

(a) (b)<br />

I<br />

N<br />

ClO ClO4- 4-<br />

Al<br />

ITO glass<br />

N+<br />

C 60<br />

PEDOT:PSS C60 C60 C60<br />

O<br />

S<br />

O<br />

n<br />

SO3 - SO3 - SO3 -<br />

n<br />

Cyanine<br />

PEDOT:PSS<br />

cyanine dye<br />

Current Density (mA/cm 2 Current Density (mA/cm )<br />

2 )<br />

0.5<br />

0.0<br />

-0.5<br />

-1.0<br />

-1.5<br />

-2.0<br />

@ 30 mW cm-2 @ 30 mW cm-2 Undoped<br />

Doped in air<br />

-0.2 0.0 0.2 0.4 0.6 0.8 1.0<br />

Voltage (V)<br />

Fig. 2: (a) Chemical structures of the materials and solar cell device architecture used in this work<br />

(b) Current-voltage characteristics of the devices measured in the dark just after fabrication<br />

(black squares) and after being exposed to ambient atmosphere for 0.5 hours under white light<br />

irradiation (red squares).<br />

National / International collaborations<br />

Centre of Competence in Energy and Mobility (CCEM) of the ETH domain. Project: ThinPV. This<br />

project is coordinated by Dr. F. Nüesch and includes 9 partners in Switzerland (see<br />

http://ccem-ch.web.psi.ch/documents/projektbeschriebe/Beschrieb_ThinPV.pdf)<br />

Prof. J. Moser (EPFL, Lausanne): Photophysics of cyanine films<br />

Prof. L. Zuppiroli (EPFL, Lausanne, Charge carrier mbility)<br />

Evaluation of 2007 and perspectives for <strong>2008</strong><br />

In 2007 the discovery of the drastic efficiency enhancement by doping cyanine dye films gave significant<br />

boost to the material class of cyanine dyes. It will lead the way to the design of high performance<br />

cyanine materials for solid organic solar cells. Of particular interest is the fact that cyanine dyes can be<br />

synthesized that strongly absorb in the near infrared domain, where only few organic materials are<br />

able to absorb so far. The doping concept elaborated in this work can be generally applied to other<br />

dyes and polymers. This shall be investigated in the future.<br />

Publications<br />

[1] Bin Fan, Roland Hany, Jacques-Eduard Moser, Frank Nüesch, Organic Electronics, 9 (<strong>2008</strong>) 85-94<br />

Doping of cyanine solar cells: enhancing charge transport, B. Fan, F. Nüesch, Empa Seite 121 von 288

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