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Correlation between Surface Photovoltage and Blend Morphology in Polyfluorene-Based Photodiodes

2005; American Chemical Society; Volume: 5; Issue: 4 Linguagem: Inglês

10.1021/nl047929s

1530-6992

Marco Chiesa, Lukas Bürgi, Ji‐Seon Kim, Rafi Shikler, Richard H. Friend, Henning Sirringhaus,

Nanowire Synthesis and Applications

We present a microscopic study of photoinduced charge generation in polyfluorene-based photovoltaic structures. The sub-100 nm lateral resolution of scanning Kelvin probe microscopy allows characterizing the three-dimensional structure of thin films of blends of poly-(9,9'-dioctylfluorene-co-benzothiadiazole) (F8BT) and poly-(9,9'-dioctylfluorene-co-bis-N,N'-(4-butylphenyl)-bis-N,N'-phenyl-1,4-phenylenediamine) (PFB). From the strong correlation between surface photovoltage and blend morphology, we propose a simple model for the lateral and vertical film structure identifying in particular those regions with the most efficient conduction pathway for the photocurrent.