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Continuous lateral gradients in film morphology for position sensitive detection and organic solar cell optimization

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Campoy-Quiles M., Randon V., Mróz M. M., Jarzaguet M., Garriga M., Cabanillas-González J.

Organic Photonics and Photovoltaics

2013

vol. 1

11-23

We present a method to fabricate binary organic donor and acceptor blends exhibiting a controlled lateral gradient in morphology. Upon combining photometry, ellipsometry and Xray maps together with photoinduced absorption measurements, we show how the gradual exposure to solvent vapor results in a varying degree of polymer crystallinity for the polythiophene/soluble fullerene system along one direction. These morphologically graded samples are characterized by a spectral photoresponse that depends on the specific location in the area of the device where the light beam impinges, a property that stands as proof-of-concept for position sensitive detection. Moreover, we demonstrate that the development of graded morphologies is an effective one-step method which allows for fast performance optimization of organic solar cells. Finally, the appropriateness of eight different solvents for morphology control via vapor annealing is evaluated in a time-effective way using the advanced method, which helps to identify boiling point and solubility as the key processing parameters.

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1 Organic Photonics and Photovoltaics

1 2013

1 Cabanillas-González J.

1 Campoy-Quiles M.

1 Garriga M.

1 Jarzaguet M.

1 Mróz M. M.

1 Randon V.

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Continuous lateral gradients in film morphology for position sensitive detection and organic solar cell optimization