Journal
THIN SOLID FILMS
Volume 520, Issue 1, Pages 582-590Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2011.07.022
Keywords
Polymer photovoltaic; Organic solar cells; P3HT:PCBM; P3HT fiber; Bulk-heterojunction; Stability
Categories
Funding
- Alexander von Humboldt fellowship
- EUROCORES - SOHYD (ESF)
- [SFB481]
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We investigated an inverted organic photovoltaic device structure in which a densely packed similar to 100 nm thin TiO2 layer on fluorine doped conducting glass serves as anode and poly(3,4-ethylenedioxythiophene): poly (styrenesulfonate)/Au layer on top of the active layer serves as cathode. The active layer is comprised of a blend of poly(3-hexylthiopene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The rectification behavior of such a device is improved significantly and injection losses are minimized compared to devices without any compact TiO2 layer. Moreover, nanostructured P3HT active layer was achieved in-situ by spin coating concentrated pure P3HT and P3HT:PCBM blend and solar cell performances on thickness of the active layer were also investigated. For the inverted solar cells constructed with different concentrations of P3HT and PCBM keeping the P3HT:PCBM ratio 1:0.8 (wt.%), the highest short circuit current and efficiency was observed when the P3HT and PCBM concentration was equal to 1.5 (wt.%) and 1.2 (wt.%) respectively. This leads to highly stable and reproducible power conversion efficiency above 3.7% at 100 mW/cm(2) light intensity under AM 1.5 conditions. (C) 2011 Elsevier B.V. All rights reserved.
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