Enhanced photovoltaic properties of polymer–fullerene bulk heterojunction solar cells by thermal annealing

The effect of a thermal annealing treatment on the performance of bulk heterojunction photovoltaic cells based on poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) and fullerene (C 60) composites is investigated. Upon thermal annealing at 120  ∘C, short-circuit current ( I sc ) an...

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Bibliographic Details
Published in:Solid state communications 2007-04, Vol.142 (3), p.181-184
Main Authors: Jin, Hui, Hou, Yanbing, Meng, Xianguo, Li, Yan, Shi, Quanmin, Teng, Feng
Format: Article
Language:English
Subjects:
A. Polymer
Applied sciences
D. Photovoltaic
Energy
Exact sciences and technology
Natural energy
Photovoltaic conversion
Solar cells. Photoelectrochemical cells
Solar energy
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Summary:The effect of a thermal annealing treatment on the performance of bulk heterojunction photovoltaic cells based on poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylene vinylene] (MEH-PPV) and fullerene (C 60) composites is investigated. Upon thermal annealing at 120  ∘C, short-circuit current ( I sc ) and power conversion efficiency ( η ) are more than tripled, while a sharp rise by eight times in I sc and η is found for the device annealed at 200  ∘C. It is concluded that the improved phase separation between MEH-PPV and C 60 leads to the enhancement of I sc and η at 120  ∘C, while thermodynamic molecule arrangement at the higher temperature of ∼200  ∘C induces a significant increase in all photovoltaic parameters of composite devices except the open-circuit voltage ( V oc ) .
ISSN:0038-1098
1879-2766
DOI:10.1016/j.ssc.2007.01.034