Single-crystal charge transfer interfaces for efficient photonic devices
(Conference Presentation)

Helena Alves; Rui M. Pinto; Ermelinda M. S. Maçôas; Carlos Baleizão; Isabel C. Santos

doi:10.1117/12.2238300

10 November 2016 Single-crystal charge transfer interfaces for efficient photonic devices (Conference Presentation)

Helena Alves, Rui M. Pinto, Ermelinda M. S. Maçôas, Carlos Baleizão, Isabel C. Santos

Proceedings Volume 9923, Physical Chemistry of Interfaces and Nanomaterials XV; 992307 (2016) https://doi.org/10.1117/12.2238300
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

Organic semiconductors have unique optical, mechanical and electronic properties that can be combined with customized chemical functionality. In the crystalline form, determinant features for electronic applications such as molecular purity, the charge mobility or the exciton diffusion length, reveal a superior performance when compared with materials in a more disordered form. Combining crystals of two different conjugated materials as even enable a new 2D electronic system. However, the use of organic single crystals in devices is still limited to a few applications, such as field-effect transistors. In 2013, we presented the first system composed of single-crystal charge transfer interfaces presenting photoconductivity behaviour. The system composed of rubrene and TCNQ has a responsivity reaching 1 A/W, corresponding to an external quantum efficiency of nearly 100%. A similar approach, with a hybrid structure of a PCBM film and rubrene single crystal also presents high responsivity and the possibility to extract excitons generated in acceptor materials. This strategy led to an extended action towards the near IR. By adequate material design and structural organisation of perylediimides, we demonstrate that is possible to improve exciton diffusion efficiency. More recently, we have successfully used the concept of charge transfer interfaces in phototransistors. These results open the possibility of using organic single-crystal interfaces in photonic applications.

Conference Presentation

Citation Download Citation

Helena Alves, Rui M. Pinto, Ermelinda M. S. Maçôas, Carlos Baleizão, and Isabel C. Santos "Single-crystal charge transfer interfaces for efficient photonic devices (Conference Presentation)", Proc. SPIE 9923, Physical Chemistry of Interfaces and Nanomaterials XV, 992307 (10 November 2016); https://doi.org/10.1117/12.2238300

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KEYWORDS

Interfaces

Crystals

Excitons

Diffusion

Photonic devices

External quantum efficiency

Infrared materials

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