- October 2012
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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 (f(c)) can be estimated with the parameters extracted from this circuit obtaining good agreement between measured and calculated f(c).
- bulk heterojunction; cutoff frequency; impedance spectroscopy; organic photodetector; deep-ultraviolet photodetector; solar-cells