TITLE

High-efficiency inverted bulk heterojunction polymer solar cells with UV ozone-treated ultrathin aluminum interlayer

AUTHOR(S)
Hongmei Zhang; Jianyong Ouyang
PUB. DATE
August 2010
SOURCE
Applied Physics Letters;8/9/2010, Vol. 97 Issue 6, p063509
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Highly efficient inverted heterojunction polymer solar cells were developed with an UV ozone-treated ultrathin aluminum interlayer between the active layer and indium tin oxide (ITO). The ultrathin aluminum interlayer was fabricated by thermally depositing on ITO and subsequently treating it with UV ozone. Thus, it forms an alumina layer that improves electron extraction. Power conversion efficiency of 3.92%, open circuit voltage of 0.583 V, short-circuit current of 10.95 mA/cm2 and fill factor of 0.614 were achieved on the inverted devices of a poly(3-hexylthiophene) and [6,6]-phenyl-C61-butyric acid methyl ester blend under AM1.5 illumination (100 mW/cm2), which are significantly higher than that of the control device without the interlayer. The significant improvement in device performances is attributed to the reduction in energy barrier for electron extraction due to the formation of alumina, as revealed by ultraviolet photoelectron spectroscopy.
ACCESSION #
52929542

 

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