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

M. Campoy-Quiles
  • Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Esfera UAB, Bellaterra 08193, Spain
  • Email:
/ V. Randon
  • Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Esfera UAB, Bellaterra 08193, Spain
/ M. M. Mróz
  • Instituto Madrileño de Estudios Avanzados en Nanociencia (IMDEA-Nanociencia), Cantoblanco, 28049 – Madrid, Spain
/ M. Jarzaguet
  • Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Esfera UAB, Bellaterra 08193, Spain
/ M. Garriga
  • Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Esfera UAB, Bellaterra 08193, Spain
/ J. Cabanillas-González
  • Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Esfera UAB, Bellaterra 08193, Spain
Published Online: 2013-07-29 | DOI: https://doi.org/10.2478/oph-2013-0002


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.

Keywords: organic photovoltaics; position sensitive detectors; combinatorial screening; morphology gradients

PACS: 02.10.Ox; 85.60.-q; 81.05.Fb; 61.66.Hq; 88.40.jr

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About the article

Received: 2013-02-21

Accepted: 2013-04-15

Published Online: 2013-07-29

Citation Information: Organic Photonics and Photovoltaics, ISSN (Online) 2299-3177, DOI: https://doi.org/10.2478/oph-2013-0002. Export Citation

©2013 Versita Sp. z o.o.. This content is open access.

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