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Tamilavan, Vellaiappillai,Kim, A-Young,Lee, Hojeong,Kim, Hye-Bin,Kim, Sangjun,Kang, Misook,Hyun, Myung Ho Elsevier 2014 Synthetic metals Vol.191 No.-
To investigate the N-aryl group influences on the optical, electrochemical and photovoltaic properties of thiophene-(N-aryl)pyrrole-thiophene (N-Aryl TPT)-based dyes, two new dyes (TPTDYE 3 and TPTDYE 4) were prepared by attaching the electron donating and non-planar 4'-(N,N-diphenylamino)biphenyl or 3-fluoro-4'-(N,N-diphenylamino)biphenyl group on the pyrrole nitrogen of the thiophene-pyrrole-thiophene (TPT) unit and the electron accepting cyanoacrylic acid group at the 3-position of pyrrole unit. In addition, another two new dyes (TPTDYE 5 and TPTDYE 6) were obtained by introducing two more triphenylamine groups on the both side of the TPT unit of TPTDYE 3 and TPTDYE 4, respectively. The shapes of the dyes are found to be similar to umbrella, since three electron donor groups are placed around the cyanoacrylic acid group positioned at middle of the dyes. The absorption spectra of dyes TPTDYE 5 and TPTDYE 6 were found to be relativity broad (similar to 300-475 nm) and red shifted compared to the absorption spectra (similar to 300-425 nm) of dyes TPTDYE 3 and TPTDYE 4. The electrochemical studies indicate that the HOMO energy levels of the non-fluorinated dyes (TPTDYE 3 and TPTDYE 5) were slightly deeper than fluorinated dyes (TPTDYE 4 and TPTDYE 6). The dye sensitized solar cells (DSSCs) prepared with TPTDYE 5 with and without coadsorbent offered a maximum energy conversion efficiency of 4.02% and 3.42%, respectively. (C) 2014 Elsevier B.V. All rights reserved.
VELLAIAPPILLAI TAMILAVAN,송명관,Rajalingam Agneeswari,Sang Jun Kim,현명호 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.4
New electron deficient acceptor-acceptor-acceptor type of monomer unit composed of weak electron accepting benzimidazole and relatively strong electron accepting benzothiadiazole derivatives namely 4,7-bis(6-bromo- 1-(2-ethylhexyl)-1H-benzo[d]imidazol-2-yl)benzo[c][1,2,5]thiadiazole (BBB) was synthesized. The Stille polycondensation of the newly synthesized BBB monomer with electron donating 2,6-bis(trimethyltin)-4,8- bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene (BDT) afforded donor-acceptor-acceptor-acceptor type of polymer namely 2,6-(4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene)-alt-4,7-bis(1-(2-ethylhexyl)- 1H-benzo[d]imidazol-2-yl)benzo[c][1,2,5]thiadiazole (PBDTBBB). The opto-electrical studies revealed that the absorption band of PBDTBBB appeared in the range of 300 nm-525 nm and its highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels were positioned at −5.18 eV and −2.84 eV, respectively. The power conversion efficiency (PCE) of the polymer solar cell (PSC) prepared from PBDTBBB:PC71BM (1:2 wt %) blend was 1.90%.
Vellaiappillai Tamilavan,송명관,진성호,현명호 한국고분자학회 2013 Macromolecular Research Vol.21 No.4
Three new low band gap random copolymers containing 3-octylthiophene, 2,1,3-benzothiadiazole and 1-(2,6-diisopropylphenyl)-2,5-di(2-thienyl)pyrrole at different ratios were synthesized by Suzuki polycondensation. The three copolymers were found to exhibit quite different absorption behaviors. Among the three copolymers,PTTPTTB-P1 prepared with the three monomer units at a ratio of 2:1:1 was found to show a quite broad and flat absorption maximum from 440 to 560 nm as a thin film, whereas PTTPTTB-P2 or PTTPTTB-P3 prepared with the three monomer units at a ratio of 3:2:1 or 3:1:2, respectively, were found to show a distinct absorption maximum at 550 nm or 470 nm, respectively. The optical band gaps of the copolymers estimated from the onset wavelength of absorption were 1.80 eV for all three polymers. Each of the copolymers was examined as an electron donor blending with PC70BM as an electron acceptor in bulk heterojunction (BHJ) solar cells. The maximum power conversion efficiency (PCE) of the BHJ solar cells fabricated in ITO/PEDOT:PSS/polymer:PC70BM (1:5 wt%)/LiF/Al configurations was 2.03% when the PTTPTTB-P1:PC70BM (1:5 wt%) blend was used as an active layer.
Tamilavan, Vellaiappillai,Roh, Kyung Hwan,Agneeswari, Rajalingam,Lee, Dal Yong,Cho, Shinuk,Jin, Youngeup,Park, Sung Heum,Hyun, Myung Ho The Royal Society of Chemistry 2014 Journal of Materials Chemistry A Vol.2 No.47
<P>As an effort to improve the photovoltaic properties of a highly efficient large band gap (2.11 eV) alternating copolymer, P(BDT-TDPPDT), comprised of electron rich benzodithiophene (BDT) and novel electron accepting pyrrole-based imide functionalized 4,6-bis(thiophen-2-yl)-2,5-dioctylpyrrolo[3,4-<I>c</I>]pyrrole-1,3-dione (TDPPDT) derivatives, we incorporated a relatively strong electron accepting thiophene-based imide functionalized thieno[3,4-<I>c</I>]pyrrole-4,6-dione (TPD) unit in its main chain<I>via</I>random copolymerization between BDT, TDPPDT and TPD units to give polymer P1. The incorporation of a TPD unit resulted in significant improvement in the optoelectrical and photovoltaic properties. P1 exhibits lower optical band gap (1.91 eV) and a deeper lowest unoccupied molecular orbital (LUMO) energy level compared to those of P(BDT-TDPPDT). The hole mobility of P1 was 3.66 × 10<SUP>−4</SUP>cm<SUP>2</SUP>V<SUP>−1</SUP>s<SUP>−1</SUP>and the PSC made with a simple device structure of ITO/PEDOT:PSS/P1:PC70BM(1 : 2.25 wt%) + 3 vol%/Al gave a maximum power conversion efficiency (PCE) of 7.03% with high photovoltaic parameters, such as an open-circuit voltage (<I>V</I>oc) of 0.87 V, a short-circuit current (<I>J</I>sc) of 11.52 mA cm<SUP>−2</SUP>and a fill factor (FF) of 70%. Interestingly, P1-based PSCs exhibited a high incident photon to current efficiency (IPCE) of a maximum of 78% at 410 nm and a more than 70% response between 370-590 nm. The PCE achieved in this study is the highest value reported thus far among PSCs made with random copolymers.</P>