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Seo, Jooyeok,Nam, Sungho,Jeong, Jaehoon,Lee, Chulyeon,Kim, Hwajeong,Kim, Youngkyoo American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.1
<P>We report planar liquid crystal-gated-organic field-effect transistors (LC-<I>g</I>-OFETs) with a simple in-plane drain–source–gate electrode structure, which can be cost-effectively prepared by typical photolithography/etching processes. The LC-<I>g</I>-OFET devices were fabricated by forming the LC layer (4-cyano-4′-pentylbiphenyl, 5CB) on top of the channel layer (poly(3-hexylthiophene), P3HT) that was spin-coated on the patterned indium–tin oxide (ITO)-coated glass substrates. The LC-<I>g</I>-OFET devices showed p-type transistor characteristics, while a current saturation behavior in the output curves was achieved for the 50–150 nm-thick P3HT (channel) layers. A prospective on/off ratio (>1 × 10<SUP>3</SUP>) was obtained regardless of the P3HT thickness, whereas the resulting hole mobility (0.5–1.1 cm<SUP>2</SUP>/(V s)) at a linear regime was dependent on the P3HT thickness. The tilted ordering of 5CB at the LC-P3HT interfaces, which is induced by the gate electric field, has been proposed as a core point of working mechanism for the present LC-<I>g</I>-OFETs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-1/am506609s/production/images/medium/am-2014-06609s_0004.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am506609s'>ACS Electronic Supporting Info</A></P>
Seo, Jooyeok,Song, Myeonghun,Jeong, Jaehoon,Nam, Sungho,Heo, Inseok,Park, Soo-Young,Kang, Inn-Kyu,Lee, Joon-Hyung,Kim, Hwajeong,Kim, Youngkyoo American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.36
<P>We report broadband pH-sensing organic field-effect transistors (OFETs) with the polymer-dispersed liquid crystal (PDLC) sensing layers. The PDLC layers are prepared by spin-coating using ethanol solutions containing 4-cyano-4'-pentyl-biphenyl (503) and a diblock copolymer (PAA-b-PCBOA) that consists of LC-philic block [poly(4-cyanobiphenyl-4-oxyundecyl acrylate) (PCBOA)] and acrylic acid block [poly(acrylic acid) (PAA)]. The spin-coated sensing layers feature of SOB microdoniains (<5 mu m) encapsulated by the PAA-b-PCBOA polymer chains: The resulting LC-integrated-OFETs (PDLC-i-OFETs) can detect precisely and reproducibly a wide range of pH with only small amounts (10-40 mu L) of analyte solutions in both static and dynamic perfusion modes. The positive drain current change is measured for acidic solutions (pH < 7), whereas basic solutions (pH > 7) result in the negative change of drain current. The drain current trend in the present PDLC-i-OFET devices is explained by the shrinking expanding mechanism of the PAA chains in the diblock copolymer layers.</P>
Jooyeok Seo,Sungho Nam,Soohyeong Park,Chulyeon Lee,Jaehun Park,Hwajeong Kim,Youngkyoo Kim IEEE 2017 IEEE journal of selected topics in quantum electro Vol.23 No.4
<P>Terahertz spectroscopy was employed to investigate the charge carrier dynamics of aniline-treated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) films. The measured charge carrier lifetime was correlated with the performances of organic solar cells with the aniline-treated PEDOT:PSS hole-collecting layers. The result showed that the charge carrier lifetime was sensitive to the aniline content. The longest charge carrier lifetime was achieved for 1.2 mol.% aniline, which led to the highest power conversion efficiency of 8.83%. In particular, the trend of the charge carrier lifetime was found to be strongly affected by the surface morphology of the aniline-treated PEDOT:PSS layers.</P>
Lee, Sooyong,Seo, Jooyeok,Jeong, Jaehoon,Lee, Chulyeon,Song, Myeonghun,Kim, Hwajeong,Kim, Youngkyoo Korea Photovoltaic Society 2017 Current Photovoltaic Research Vol.5 No.3
Here we report the influence of thermal treatment on the performance of high efficiency polymer solar cells with the bulk heterojunction films of poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b'] dithiophene-alt-3-fluorothieno[3,4-b]thiophene-2-carboxylate] (PTB7-Th) and [6,6]-phenyl $C_{71}$ butyric acid methyl ester ($PC_{71}BM$). The crystalline nanostructure of PTB7-Th:$PC_{71}BM$ layers, which were annealed at three different temperatures, was investigated by employing synchrotron radiation grazing incidence X-ray diffraction (GIXD) technique. Results showed that the device performance was slightly reduced by thermal annealing at $50^{\circ}C$ but became significantly poor by thermal annealing at $100^{\circ}C$. The poor device performance by thermal annealing was attributed to the collapse in the crystalline nanostructure of PTB7-Th in the PTB7-Th:$PC_{71}BM$ layers as evidenced by the GIXD measurements that exhibited huge reduction in the intensity of PTB7-Th (100) peak even at $50^{\circ}C$.
Nam, Sungho,Seo, Jooyeok,Park, Soohyeong,Lee, Sooyong,Jeong, Jaehoon,Lee, Hyena,Kim, Hwajeong,Kim, Youngkyoo American Chemical Society 2013 ACS APPLIED MATERIALS & INTERFACES Vol.5 No.4
<P>Hybrid phototransistors (HPTRs) were fabricated on glass substrates using organic/inorganic hybrid bulk heterojunction films of p-type poly(3-hexylthiophene) (P3HT) and n-type zinc oxide nanoparticles (ZnO<SUB><I>NP</I></SUB>). The content of ZnO<SUB><I>NP</I></SUB> was varied up to 50 wt % in order to understand the composition effect of ZnO<SUB><I>NP</I></SUB> on the performance of HPTRs. The morphology and nanostructure of the P3HT:ZnO<SUB><I>NP</I></SUB> films was examined by employing high resolution electron microscopes and synchrotron radiation grazing angle X-ray diffraction system. The incident light intensity (<I>P</I><SUB>IN</SUB>) was varied up to 43.6 μW/cm<SUP>2</SUP>, whereas three major wavelengths (525 nm, 555 nm, 605 nm) corresponded to the optical absorption of P3HT were applied. Results showed that the present HPTRs showed typical p-type transistor performance even though the n-type ZnO<SUB><I>NP</I></SUB> content increased up to 50 wt %. The highest transistor performance was obtained at 50 wt %, whereas the lowest performance was measured at 23 wt % because of the immature bulk heterojunction morphology. The drain current (<I>I</I><SUB>D</SUB>) was proportionally increased with <I>P</I><SUB>IN</SUB> due to the photocurrent generation in addition to the field-effect current. The highest apparent and corrected responsivities (<I>R</I><SUB>A</SUB> = 4.7 A/W and <I>R</I><SUB>C</SUB> = 2.07 A/W) were achieved for the HPTR with the P3HT:ZnO<SUB><I>NP</I></SUB> film (50 wt % ZnO<SUB><I>NP</I></SUB>) at <I>P</I><SUB>IN</SUB> = 0.27 μW/cm<SUP>2</SUP> (555 nm).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2013/aamick.2013.5.issue-4/am302765a/production/images/medium/am-2012-02765a_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am302765a'>ACS Electronic Supporting Info</A></P>
Fukuta, Seijiro,Seo, Jooyeok,Lee, Hoyeol,Kim, Hwajeong,Kim, Youngkyoo,Ree, Moonhor,Higashihara, Tomoya American Chemical Society 2017 Macromolecules Vol.50 No.3
<P>A series of novel pi-conjugated copolymers based on 2,2'-bis(1,3,4-thiadiazole) (BTDz) have been developed. Among them, the BTDz-based donor-acceptor alternating copolymer with the (E)-1,2-di(3-(2-ethylhexyl)thiophene)vinylene donor unit (PBTDzTV) exhibited a high solubility and high crystallinity. PBTDzTVs favorably self assembled, forming face-on and edge-on multibilayer structures in thin nanoscale films. The relative volume fractions of these structures varied depending on the polymer's molecular weight. The higher molecular weight polymer formed a higher volume fraction of the face-on structure; in particular, the polymer with a 26.6 kDa of number-average molecular weight made only the face-on structure. The device performance was improved as the polymer molecular weight and the volume fraction of the face-on structure increased. The bulk-heterojunction photovoltaic device based on PBTDzTV:PC71BM demonstrated the high power conversion efficiency (PCE) of 8.04% when the device was fabricated with the highest molecular weight polymer having the face-on structure.</P>