Thickness dependence of organic photodetector bandwidth

B. Arredondo ^[1] ; B. Romero ^[1] ; C. de Dios ^[2] ; R. Vergaz ^[2] ; R. Criado ^[2] ; J. M. Sánchez-Pena ^[2]
1. [1] Universidad Rey Juan Carlos
  
  Universidad Rey Juan Carlos
  
  Madrid, España
2. [2] Universidad Carlos III de Madrid
  
  Universidad Carlos III de Madrid
  
  Madrid, España
Localización: Proceedings of the 2013 Spanish Conference on Electron Devices / Héctor García (aut.), Helena Castán Lanaspa (aut.), 2013, ISBN 9781467346665
Idioma: español
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Resumen
- Organic bulk heterojunction photodiodes based on a blend of poly(3-hexylthiophene):1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6, 6)C61 (P3HT:PCBM) have been fabricated with different active layer thicknesses. Current-voltage characteristics and cut-off frequency were measured under Green-LED illumination. Impedance measurements were performed and a simple equivalent circuit was used to fit the resulting Cole-cole diagram. Parameters obtained from the fit were used to estimate the theoretical photodetector cut-off frequency and compared to the experimental one. The material dielectric constant was estimated using the capacitance obtained from the impedance fit.