S-shaped current-voltage characteristics of organic solar devices

Details S-shaped current-voltage characteristics of organic solar devices S-shaped current-voltage characteristics of organic solar devices

2010-05-31

arxiv.org/abs/1005.5669v2

Phys. Rev. B 82, 115306 (2010)

Physics

Condensed Matter

Materials Science

9 pages, 7 figures

Scientific paper

10.1103/PhysRevB.82.115306

Measuring the current-voltage characteristic of organic bulk heterojunction solar devices sometimes reveals an s-shaped deformation. We qualitatively produce this behaviour by a numerical device simulation assuming a reduced surface recombination. Furthermore we show how to experimentally create these double diodes by applying an oxygen plasma etch on the indium tin oxide (ITO) anode. Restricted charge transport over material interfaces accumulates space charges and therefore creates s-shaped deformations. Finally we discuss the consequences of our findings for the open circuit voltage $V_{oc}$

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