Correlation between Surface Photovoltage and Blend Morphology in Polyfluorene-Based Photodiodes
- 11 March 2005
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 5 (4) , 559-563
- https://doi.org/10.1021/nl047929s
Abstract
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.Keywords
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