吸收(声学)
电荷(物理)
红外线的
近红外光谱
响应度
光电导性
光电二极管
吸收光谱法
载流子
接受者
作者
Sascha Ullbrich,Bernhard Siegmund,Andreas Mischok,Andreas Hofacker,Johannes Benduhn,Donato Spoltore,Koen Vandewal
标识
DOI:10.1021/acs.jpclett.7b02571
摘要
We present organic near-infrared photodetectors based on the absorption of charge-transfer (CT) states at the zinc-phthalocyanine–C60 interface. By using a resonant optical cavity device architecture, we achieve a narrowband detection, centered around 1060 nm and well below (>200 nm) the optical gap of the neat materials. We measure transient photocurrent responses at wavelengths of 532 and 1064 nm, exciting dominantly the neat materials or the CT state, respectively, and obtain rise and fall times of a few nanoseconds at short circuit, independent of the excitation wavelength. The current transients are modeled with time-dependent drift-diffusion simulations of electrons and holes which reconstruct the photocurrent signal, including capacitance and series resistance effects. The hole mobility of the donor material is identified as the limiting factor for the high-frequency response. With this knowledge, we demonstrate a new device concept, which balances hole and electron extraction times and achieves a ...
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