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yanjiao12

新虫 (初入文坛)

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虫号: 1144527
注册: 2010-11-11
专业: 能源化工

[求助] 聚合物/ZnO太阳能电池

Polymer-based solar cells consisting of ZnO nanorods and poly(1-methoxy-4-(2-ethylhexyloxy)-p-phenyl-enevinylene) (MEH-PPV) are investigated by current voltage characterization and intensity modulatedphotovoltage spectroscopy (IMVS). The high quality ZnO nanorod arrays were prepared by electrodeposition,
in which the length (Ln) and the concentration of deep level defects of ZnO nanorods were controlled bydeposition time (Td). Results show that increasing Td leads to ZnO nanorods with linearly increased Ln butdifferently increased defect concentration for the MEH-PPV/ZnO solar cells, providing a peak device power
conversion efﬁciency of 0.34% at AM 1.5 illumination (100 mW/cm2) for Td 10 min. The electron lifetimesin MEH-PPV/ZnO nanorod devices at open circuit were studied by means of IMVS for the ﬁrst time, and theinﬂuences of Ln and defect concentration on the charge recombination kinetics and device performance were
revealed. It is found that, in the MEH-PPV/ZnO devices with high quality ZnO nanorods with rather lowdefect concentration, both photocurrent and recombination rate are mainly dependent on the Ln value as a
result of the exponential attenuation of incident light intensity in the device, but the open circuit voltage Voc is more sensitive to the defect concentration. The present study provides new insights into designing the
nanostructures for the hybrid photovoltaic devices based on vertically aligned one-dimensional nanoarrays.

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