Near-infrared organic photodetectors with a soluble Alkoxy-Phthalocyanine derivative
Near-infrared organic photodetectors with a soluble Alkoxy-Phthalocyanine derivative
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DOI：
10.1016/j.optmat.2022.112209
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发表时间：
2022-04
影响因子：
3.9
通讯作者：
S. Kabir;Yukiko Takayashiki;A. Ohno;J. Hanna;H. Iino
中科院分区：
文献类型：
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作者：
S. Kabir;Yukiko Takayashiki;A. Ohno;J. Hanna;H. Iino
体异质结（BHJ）的条件是光电探测器的一个重要因素，因为它显着影响激子从有源层内的束缚激子对解离的效率。在本研究中，我们实现了近红外（NIR）光电探测器与BHJ系统的可溶性供体有机半导体，1，4，8，11，15，18，22，25-八辛氧基-酞菁，和苯基-C61-丁酸甲酯。通过实验的有机材料的共混比，我们观察到的器件性能的实质性变化，由于在结晶条件和活性层的形态的变化。我们的有机光电二极管具有优化的BHJ有源层，在770 nm的近红外波长下，在-0.5 V的偏压下，达到了2.1 × 1012 Jones的散粒噪声限制的比探测率和18%的外量子效率。我们将这种改善归因于BHJ内部晶粒尺寸的减小，这导致了在施主-受主界面处激子解离效率的增加。
The condition of the bulk-heterojunction (BHJ) is an important factor for photodetectors as it significantly influences the efficiency of exciton dissociation from bound exciton pairs inside the active layer. In this study, we realized near-infrared (NIR) photodetectors with the BHJ system of a soluble donor organic semiconductor, 1,4,8,11,15,18,22,25-octaoctyloxy-phthalocyanine, and phenyl-C61-butyric acid methyl ester. By experimenting with the blend ratio of the organic materials, we observed substantial change of device performance owing to the change in the crystalline condition and morphology of the active layer. Our organic photodiodes with optimized BHJ active layer reached shot noise limited specific detectivity of 2.1 × 1012Jones and external quantum efficiency of 18% with a bias of −0.5 V at the NIR wavelength of 770 nm. We attributed this improvement to the decrease in grain size inside the BHJ which resulted in an increased exciton dissociation efficiency at the donor–acceptor interface.