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Lee, Hock Beng,Jin, Won-Yong,Ovhal, Manoj Mayaji,Kumar, Neetesh,Kang, Jae-Wook The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.5
<P>Transparent conducting electrodes (TCEs) have played a pivotal role in driving the continuous development of optoelectronics technologies, which include organic optoelectronic applications. In recent years, there has been huge interest in designing innovative TCEs to replace the conventional indium tin oxide (ITO) electrodes, which suffer from complex fabrication issues and are incompatible with flexible, wearable electronic devices. In this regard, TCEs based on metal meshes are considered to be the best candidates because of their inherently high electrical conductivity, optical transparency, mechanical robustness and, more importantly, cost-competitiveness. In this review, we describe the technology developments of metal mesh-based transparent conductors and their applications in organic optoelectronic devices, including organic and perovskite solar cells, organic light emitting diodes, supercapacitors, electrochromic devices <I>etc.</I> Specifically, we discuss the fundamental features, optoelectronic properties, fabrication techniques and device applications of metal mesh TCEs. We also highlight the important criteria for evaluating the performance of metal mesh electrodes and propose some new research directions in this emerging field.</P>
Kumar, Neetesh,Lee, Hock Beng,Hwang, Sunbin,Kim, Tae-Wook,Kang, Jae-Wook Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.775 No.-
<P><B>Abstract</B></P> <P>A simple, cost-effective, and one-step procedure for fabrication of gold-nanoparticle-transition metal oxide (Au-TMO) thin films with tuned optical and structural properties is described. In this approach, a homogeneous mixed precursor solution was used to fabricate Au-MoO<SUB>3</SUB> and Au-WO<SUB>3</SUB> thin films via a spray pyrolysis technique. The in-situ grown Au nanoparticles in the host matrices exhibited a characteristic surface plasmon resonance absorption in the visible-NIR region with peak positions at λ<SUB>max</SUB> ≈ 600 nm, ≈550 nm, and ≈575 nm for Au-MoO<SUB>3</SUB>, Au-<I>a</I>-WO<SUB>3</SUB> (amorphous), and Au-<I>h</I>-WO<SUB>3</SUB> (hexagonal) films, respectively. The structural and morphological characterization measurements confirmed that the high purity in-situ grown Au nanoparticles were 10–100 nm in size, and individual particles were embedded into the host matrices. These films were applied as plasmon-induced photoelectric conversion devices with ITO/NiO<SUB>x</SUB>/Au-WO<SUB>3</SUB>/Ag structures as a prototype device. The device exhibited a short-circuit current of 0.1 mA with an open-circuit voltage of ∼1.4 V under one-sun illumination. Our one-step fabrication approach is highly promising for fabricating other Au-TMOs thin films with tuned optical properties on a large area and can be applied for various optoelectronic applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Gold-nanoparticle-transition metal oxide (Au-TMO) thin films. </LI> <LI> The Au-MoO<SUB>3</SUB> and Au-WO<SUB>3</SUB> thin films with tuned plasmonic properties. </LI> <LI> Simple, one-step and inexpensive spray pyrolysis techniques using. </LI> <LI> Plasmon-induced photoelectric conversion devices with ITO/NiO<SUB>x</SUB>/Au-WO<SUB>3</SUB>/Ag structures. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>The Au-TMOs (Au-MoO<SUB>3</SUB> and Au-WO<SUB>3</SUB>) thin films with tuned plasmonic properties are fabricated by simple, one-step and inexpensive spray pyrolysis techniques using homogeneous mixed precursors of host and gold.</P> <P>[DISPLAY OMISSION]</P>
Ginting, Riski Titian,Lee, Hock Beng,Tan, Sin Tee,Tan, Chun Hui,Jumali, Mohd. Hafizuddin Hj.,Yap, Chi Chin,Kang, Jae-Wook,Yahaya, Muhammad American Chemical Society 2016 The Journal of Physical Chemistry Part C Vol.120 No.1
<P>A simple low-temperature solution processed bismuth-doped ZnO nanorods (NRs) and poly(3-hexylthiophene) (P3HT) were used as electron acceptor and donor, respectively, in a hybrid inorganic-organic photovoltaic system. Controlling Bi precursor concentration via solution processing (hydrothermal method) plays an important role in altering the morphology, structure, and intrinsic defects of ZnO NRs. Interstitial doping of BiBi2O3 into ZnO (BiZO) NRs results in simultaneous improvement of the open circuit voltage and short circuit current density primarily due to prolonged charge carrier recombination lifetime, increased donor-acceptor interfacial areas with efficient exciton dissociation, and charge carrier mobility. As a result, the power conversion efficiency of the 2 wt % BiZO NRs-P3HT device was significantly enhanced by 55% compared with that of the pristine device. Overall, our study highlighted the immense potential of BiZO NRs as an excellent electron acceptor for fabrication of hybrid optoelectronic devices.</P>