Organic photodetector (OPD) based on simple bilayer heterojunction of pentacene and fullerene (C₆₀) has been fabricated using thermal evaporation method. Absorption spectra of series of OPD, annealed at different temperatures, have been observed over a spectral range between 400 nm and 700 nm. At 0 V and at wavelength 650 nm, external quantum efficiency (EQE) = 5% and responsivity of 0.025 A/W have been achieved for an OPD annealed at 90 °C. For the same device, the maximum ratio of photocurrent to dark current density is found to be of the order of 2.5 × 10³. Furthermore, OPD annealed at 90 °C has exhibited maximum detectivity of 2 × 10¹⁰ Jones and response time of 180 ms. Structural characterization confirms formation of small grain size of pentacene and C₆₀ molecules thereby leading to improvement of the device performance. Our experimental signatures seem to indicate that pentacene and C₆₀ based OPD, after suitable engineering, might be promising for red light detection applications.

利用热蒸发法制备了基于并五苯和富勒烯的简单双层异质结的有机光电探测器（OPD）（C ₆₀）。在400 nm至700 nm的光谱范围内，观察到了在不同温度下退火的一系列OPD的吸收光谱。在90°C退火的OPD，在0 V和650 nm波长下，外部量子效率（EQE）= 5％，响应度为0.025 A / W。对于同一器件，发现光电流与暗电流密度的最大比率约为2.5×10 ³。此外，在90°C退火的OPD的最大探测灵敏度为2×10 ¹⁰ Jones，响应时间为180 ms。结构表征证实并五苯和碳的小晶粒形成_60个分子，从而改善了器件性能。我们的实验特征似乎表明，并五苯和基于C ₆₀的OPD经过适当的工程设计，对于红光检测应用可能很有希望。