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Unsymmetrical Squaraine Dye-Based Organic Photodetector Exhibiting Enhanced Near-Infrared Sensitivity
The Journal of Physical Chemistry C ( IF 3.7 ) Pub Date : 2020-09-10 , DOI: 10.1021/acs.jpcc.0c06497
Guruprasad M. Somashekharappa 1, 2 , Chinju Govind 1, 2 , Vijith Pulikodan 3 , Megha Paul 1, 2 , Manoj A. G. Namboothiry 3 , Suresh Das 4 , Venugopal Karunakaran 1, 2
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An unsymmetrical squaraine (SQ) derivative containing anthracene and phenyl hydrazine (ANPHSQ) units linked to the central SQ was synthesized and used as electron donors in bulk heterojunction photovoltaic mode organic photodetectors (OPD), containing PCBM as the electron acceptor. Although the ANPHSQ exhibited a strong narrow band in the near infrared peaking at ∼760 nm in solution, the OPD constructed with this dye exhibited a broad spectral response extending to 950 nm. The enhanced sensitivity in the long wavelength region could be attributed to formation of ANPHSQ aggregates within the devices. A photocurrent of 1.3 mA/cm2, almost 3–5 orders of magnitude larger than the dark current (∼50 nA/cm2), was observed in the presence of light at −1 V bias condition. Devices showed an increase in external quantum efficiency from ∼4 to ∼12% as the bias varied from 0 to −1 V. At a reverse bias of −1 V, the device with a ANPHSQ exhibited a maximum shot-noise-limited specific detectivity of 6 × 1011 cm Hz1/2 W–1 (Jones) @ 840 nm with an ultrafast photoresponse in the range of ∼15 ns. The study of relaxation dynamics of the ANPHSQ excited state using femtosecond pump–probe spectroscopy and time-correlated single-photon counting indicated efficient charge transfer between the excited state of ANPHSQ and PCBM.

中文翻译:

不对称的基于方蓝宝石染料的有机光电探测器具有增强的近红外灵敏度

合成了一个不对称的方酸(SQ)衍生物,该衍生物包含与中央SQ连接的蒽和苯肼(ANPHSQ)单元,并用作包含PCBM作为电子受体的本体异质结光伏模式有机光电探测器(OPD)中的电子给体。尽管ANPHSQ在溶液中的约760 nm处的近红外峰处显示出很强的窄带,但是用这种染料构建的OPD表现出了宽光谱响应,延伸至950 nm。长波长区域中增强的灵敏度可归因于器件内ANPHSQ聚集体的形成。光电流为1.3 mA / cm 2,比暗电流(〜50 nA / cm 2)大将近3–5个数量级)是在-1 V偏压条件下在有光的情况下观察到的。随着偏压从0到-1 V变化,器件的外部量子效率从约4%升高到约12%。在-1 V的反向偏压下,具有ANPHSQ的器件表现出最大的散粒噪声限制的比检测率在840 nm处具有6×10 11 cm Hz 1/2 W –1(Jones)的光,具有约15 ns的超快光响应。所述的松弛动力学研究ANPHSQ使用飞秒泵浦-探测光谱和时间相关单光子计数激发态指示的激发态之间的有效电荷转移ANPHSQ和PCBM。
更新日期:2020-10-02
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