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The effect of a MoOx hole-extracting layer on the performance of organic photovoltaic cells based on small molecule planar heterojunctions

✍ Scribed by I. Hancox; P. Sullivan; K.V. Chauhan; N. Beaumont; L.A. Rochford; R.A. Hatton; T.S. Jones

Publisher: Elsevier Science
Year: 2010
Tongue: English
Weight: 770 KB
Volume: 11
Category: Article
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2010.09.014

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✦ Synopsis

We report a significant increase in the open circuit voltage (V oc ) and power conversion efficiency in both chloroaluminium phthalocyanine (ClAlPc)/fullerene (C 60 ) and boron subphthalocyanine chloride (SubPc)/C 60 organic photovoltaic (OPV) cells with the insertion of a thin molybdenum oxide (MoO x ) hole-extracting layer. This improvement was not seen with copper phthalocyanine (CuPc)/C 60 , and the addition of the MoO x layer leads to reduced device performance for pentacene/C 60 cells. Cells containing the MoO x layer demonstrated significantly improved stability compared to the cells deposited on bare indiumtin oxide (ITO). External quantum efficiency (EQE) measurements taken before and after constant AM1.5G illumination for 60 min showed reduced current losses for all cells containing the MoO x layer, especially in spectral regions where the donor layer contributes. We attribute this improvement to the increased stability at the MoO x /donor interface.

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