Dynamic characterization of organic bulk heterojunction photodetectors

The authors report the dynamic properties of bulk heterojunction photodiodes based on a polymer blend system consisting of poly(3-hexylthiophene-2,5-diyl) and the fullerene derivative [6,6]-phenyl C-61-butyric acid methyl ester. Devices with a high-frequency contact layout were analyzed under continuous wave and pulsed laser illumination (lambda=532 nm). The organic photodiodes exhibit a pulse response with a full width at half maximum of 11 ns to the applied 1.6-ns-long laser pulses. Rise times as small as 1.6 ns and fall times < 40 ns were measured under applied reverse bias. (c) 2007 American Institute of Physics.