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| Book | PreJuSER-45852 |
2000
Forschungszentrum, Zentralbibliothek
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/20570
Report No.: Juel-3729
Abstract: The organic junction of vacuum sublimated thin films of p-type zinc-phthalocyanine (ZnPc) and the ntype perylene pigment, N, N'-dimethyl-3,4,9,10-perylenbis (carboximid) (MPP) was investigated in detail . From modeling of experimentally determined photocurrent spectra the active thickness of the junction formed by these two materials is determined to be restricted to the range of about 10 nm. This modeling gives also evidence of a space charge region in which all the absorbed photons lead to photocurrent whereas the photons absorbed outside do not contribute . A careful investigation of the electroabsorption spectra - determined for the first time in voltage dependent measurements of organic p/n-hetero junction solar cells - shows clear evidence of an electric field within the organic solar cell. Furthermore the luminescence quenching observed when the cell is polarized in depletion fully confirms the expected voltage dependence of a space charge model . All three experiments provide clear evidence of a classical p/n-type depletion layer formed at the interface of the two organic layers. In order to achieve a higher internal photocurrent efficiency (IPCE) a mixed layer of ZnPc with C 60 was evaporated onto the MPP layer . Instead of the classical p/n-junction of only 10 nm thickness an interconnected network is formed, extending the thickness of the photovoltaically active junction to more than 30 nm. Thereby the IPCE in the absorption maximum of the solar cells was improved from about 12% to almost 40% and a short circuit current of 3 .6 mA/cm2 was measured in a AM 1 .5 solar simulator for 860 W/m2 light intensity .
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