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High-Bandwidth Organic Photodetector Analyzed by Impedance Spectroscopy

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5 Author(s)
Arredondo, B. ; Electron. Technol. Dept., Univ. Rey Juan Carlos, Madrid, Spain ; de Dios, C. ; Vergaz, R. ; del Pozo, G.
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An organic bulk heterojunction photodetector (OPD) is fabricated on the basis of a blend of poly(3-hexyl thiophene):1-(3-methoxycarbonyl)-propyl-1-1-phenyl-(6,6) C61. The OPD responsivity is calculated from current density-voltage characteristic (J-V) under green-LED illumination obtaining 1 A/W. Frequency response at different biases is measured, which shows a high-3-dB cutoff frequency of 343 kHz at -3 V . Impedance measurements are carried out at different reverse biases, and the results are fitted with a small signal equivalent circuit. The device cutoff frequency (fc) can be estimated with the parameters extracted from this circuit obtaining good agreement between measured and calculated (fc).

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 20 )

Date of Publication:

Oct.15, 2012

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