Impact of sputtered ZnO interfacial layer on the S-curve in conjugated polymer/fullerene based-inverted organic solar cells

The impact of crystalline structure changes of sputtered ZnO interfacial layer on performances of inverted organic solar cells (OSCs) has been investigated. We find that the structural modification of the ZnO cathode interfacial layer, obtained by thermal annealing, plays a crucial role in the origi...

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Bibliographic Details
Published in:Thin solid films 2015-02, Vol.576, p.23-30
Main Authors: Jouane, Youssef, Colis, Silviu, Schmerber, Guy, Dinia, Aziz, Bazylewski, Paul, Chang, Gap Soo, Chapuis, Yves-André
Format: Article
Language:English
Subjects:
Annealing
Cathodes
Crystallites
Devices
Fullerenes
Interface engineering
Inverted organic solar cells
Magnetron sputtering
Photovoltaic cells
S-shaped J-V curves
Segregations
Solar cells
Zinc oxide
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Summary:The impact of crystalline structure changes of sputtered ZnO interfacial layer on performances of inverted organic solar cells (OSCs) has been investigated. We find that the structural modification of the ZnO cathode interfacial layer, obtained by thermal annealing, plays a crucial role in the origin and solving of the S-curve in conjugated polymer/fullerene photovoltaics. Our results show that the crystallization (i.e. crystallites size) of poly(3-hexylthiophene) (P3HT) evolves as a function of that of ZnO according to the annealing temperature. This evolution can directly impact the interfacial orientation and organization of the chains of P3HT at the ZnO buried interface. Such an ordered profile favors the vertical phase segregation and raises the carrier mobility, which explains the disappearance of the S-shape observed in current density-voltage device characteristics for annealing temperatures above 200°C. These results adequately address recent research and provide an important insight into the interfacial layers of inverted OSCs. •Role of sputtered ZnO interfacial materials in inverted organic solar cells (IOSCs)•Impact of crystalline structure changes of annealed ZnO interfacial films in IOSC performances•Organization of the chains of poly(3-hexylthiophene) (P3HT) at the ZnO buried interface•ZnO interface dependence in disappearance on the S-curve in conjugated polymer/fullerene photovoltaics
ISSN:0040-6090
1879-2731
DOI:10.1016/j.tsf.2014.12.023