Abstract
In this work, we presented experimental observation on solution-processed bulk heterojunction organic photodiode using vanadyl 2,11,20,29-tetra tert-butyl 2,3 naphthalocyanine (VTTBNc) as a p-type material. VTTBNc is blended with two different acceptors, which are PC61BM and PC71BM, to offer further understanding in evaluating the performance in organic photodiode (OPD). The blend film of VTTBNc:PC71BM with a volumetric ratio of 1:1 exhibits optimized performance in the VTTBNc blend structure with 2.31 × 109 Jones detectivity and 26.11 mA/W responsivity at a −1 V bias. The response and recovery time of VTTBNc:PC71BM were recorded as 241 ms and 310 ms, respectively. The light absorption measurement demonstrated that VTTBNc could extend the light absorption to the near-infrared (NIR) region. The detail of the enhancement of the performance by adding VTTBNc to the blend was further explained in the discussion section.
Highlights
Organic photodiodes (OPDs) are growing tremendously as an alternative to inorganic photodiodes due to their unique advantages of large-area fabrication, lightweight, low cost, detection tunability and mechanical flexibility [1,2,3,4,5]
For the last few years, the solutionprocessed bulk heterojunction (BHJ) was the prevalent design used in OPDs and organic photovoltaics (OPVs) [6,7,8,9]
The cyclic voltammetry (CV) was set up using platinum as the counter electrode with
Summary
Organic photodiodes (OPDs) are growing tremendously as an alternative to inorganic photodiodes due to their unique advantages of large-area fabrication, lightweight, low cost, detection tunability and mechanical flexibility [1,2,3,4,5]. The extended π-conjugated electron system of naphthalocyanine led to the smaller band gap and contributed to the red-shifting behavior in the NIR absorption region [16]. Small molecules are organic compounds that possess defined molecular structures with low molecular weight They are free from batch-to-batch variation and improve the fabrication repeatability compared to the conjugated polymer. Small molecules evade unwanted features of macromolecules such as chain twists and chain-end defects that give rise to structural disorder and low-lying trap states [19] It is much cheaper than conjugated polymers and making it a reasonable material to develop and study
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