N-type doping of organic electron transport materials for solar cells

Fenghong Li; Ansgar G. Werner; Kentaro Harada; Bert Maennig; Jens Drechsel; Karl Leo; Martin Pfeiffer

doi:10.1117/12.546727

8 September 2004 N-type doping of organic electron transport materials for solar cells

Fenghong Li, Ansgar G. Werner, Kentaro Harada, Bert Maennig, Jens Drechsel, Karl Leo, Martin Pfeiffer

Proceedings Volume 5464, Organic Optoelectronics and Photonics; (2004) https://doi.org/10.1117/12.546727
Event: Photonics Europe, 2004, Strasbourg, France

Abstract

To realize organic solar cells with high performance, we developed a novel way of stable n-doping using cationic dyes in electron transport materials. In our approach, the volatile donors are created in-situ from stable precursor compounds. Using the cationic dye pyronin B (PyB) as a model precursor, we carried out conductivity and field effect measurements to characterize the properties of doped naphtalene tetracarboxylic dianhydride (NTCDA) thin film. The results show a strong increase in n-type conductivity. Combined FTIR, UV/VIS/NIR and mass spectroscopic measurements suggest the formation of leuco pyronin B during sublimation of pyronin B chloride, and a subsequent charge transfer between dopant and matrix providing free electrons, which increase the n-type conductivity.

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Fenghong Li, Ansgar G. Werner, Kentaro Harada, Bert Maennig, Jens Drechsel, Karl Leo, and Martin Pfeiffer "N-type doping of organic electron transport materials for solar cells", Proc. SPIE 5464, Organic Optoelectronics and Photonics, (8 September 2004); https://doi.org/10.1117/12.546727

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KEYWORDS

Doping

FT-IR spectroscopy

Electron transport

Solar cells

Absorption

Thin films

Organic photovoltaics

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