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Improvement of photovoltaic properties by addition of a perylene compound in P3HT:PCBM BHJ system.
Jeong, Seonju,Woo, Sung-Ho,Lyu, Hong-Kun,Kim, Charm,Kim, Hoyoung,Han, Yoon Soo American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.5
<P>The synthesized n-type perylene derivative, N,N'-bis-(4-bromophenyl)-1,6,7,12-tetrakis(4-n-butoxy-phenoxy)-3,4,9,10-perylene tetracarboxdiimide (PIBr), was applied as an additive to polymer solar cells (PSCs) with P3HT [poly(3-hexylthiophene)]:PCBM [[6,6]-phenyl C61-butyric acid methyl ester] blend films. Without post thermal annealing, a considerable improvement of about 98% in power conversion efficiency was achieved by the addition of 1 wt% PIBr into a P3HT:PCBM layer, when compared with that of reference cell without the additive. The results, in combination with relevant data from UV-Vis. absorption, photoluminescence, X-ray measurements and carrier mobility studies, revealed that the addition of the perylene compound within active layer contributed to more effective charge transfer and enhanced electron mobility.</P>
Enhanced performance of polymer solar cells with a fluorocyanophenyl compound as an additive.
Jeong, Seonju,Woo, Sungho,Lyu, Hong-Kun,Kim, Wook Hyun,Sung, Shi-Joon,Han, Yoon Soo American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.12
<P>The efficiency of polymer solar cells (PSCs) with P3HT [poly(3-hexyl thiophene)]:PC61BM [[6,6]-phenyl C61-butyric acid methyl ester] blend film was improved by the incorporation of a fluorocyanophenyl compound, 3,4,5,6-tetrafluorophthalonitrile (TFP), as an additive. When the amount of TFTadditive was 5 wt% based on the total amount of P3HT and PC61BM, the highest efficiency was achieved. The annealed PSC with 5 wt% TFP had a power conversion efficiency of 4.45% compared with that (3.57%) of the reference cell without the additive, which corresponds to an increase of about 18.7% in the efficiency due to an enhancement in the short circuit current (J(sc)). A seriese of measurements such as UV-visible absorption spectroscopy, X-ray measurements, atomic force microscopic images and incident photon to current conversion efficiency (IPCE) spectra revealed that the increased J(sc) in the PSC with P3HT:PC61BM:TFP blend film was due to an improvement in both exciton generation and charge transport efficiency, resulting from higher absorbance, larger crystal size and more effective phase separation.</P>
( Seonju Jeong ),( Jiyeong Park ),( Jaeyong Lee ),( Kangwook Lee ),( Kyeman Cho ),( Gyoungmin Kim ),( Junghye Shin ),( Jongsang Kim ),( Jeonghwan Kim ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.11
Fibrinolytic enzyme genes (aprE2, aprE176, and aprE179) were introduced into the Bacillus subtilis 168 chromosome without any antibiotic resistance gene. An integration vector, pDG1662, was used to deliver the genes into the amyE site of B. subtilis 168. Integrants, SJ3-5nc, SJ176nc, and SJ179nc, were obtained after two successive homologous recombinations. The integration of each fibrinolytic gene into the middle of the amyE site was confirmed by phenotypes (Amy-, SpecS) and colony PCR results for these strains. The fibrinolytic activities of the integrants were higher than that of B. subtilis 168 by at least 3.2-fold when grown in LB broth. Cheonggukjang was prepared by inoculating each of B. subtilis 168, SJ3-5nc, SJ176nc, and SJ179nc, and the fibrinolytic activity of cheonggukjang was 4.6 ± 0.7, 10.8 ± 0.9, 7.0 ± 0.6, and 8.0 ± 0.2 (U/g of cheonggukjang), respectively at 72 h. These results showed that construction of B. subtilis strains with enhanced fibrinolytic activities is possible by integration of a strong fibrinolytic gene via a marker-free manner.
Effects of Nematic Liquid Crystal Additives on the Performance of Polymer Solar Cells
Jeong, Seonju,Kwon, Younghwan,Choi, Byeong‐,Dae,Kwak, Giseop,Han, Yoon Soo WILEY‐VCH Verlag 2010 Macromolecular Chemistry and Physics Vol.211 No.23
<P><B>Abstract</B></P><P>Nematic liquid crystals (NLCs), 4‐cyano‐4′‐pentylbiphenyl and 4‐cyano‐4′‐octylbiphenyl, were applied as additives to polymer solar cells with P3HT:PC<SUB>61</SUB>BM blend films. The incorporation of NLC additives led to a higher absorbance of the blend film, a higher crystallinity of P3HT, closer P3HT chains, larger PC<SUB>61</SUB>BM domains and enhanced hole/electron mobilities even without post‐thermal annealing. The non‐annealed PSC with 4 wt.‐% 8CB additives showed an increase in all parameters, resulting in a power conversion efficiency of 3.72% compared to 2.14% of the reference device without NLC additives. </P>
Jeong, Seonju,Cho, Changsoon,Kang, Hyunbum,Kim, Ki-Hyun,Yuk, Youngji,Park, Jeong Young,Kim, Bumjoon J.,Lee, Jung-Yong American Chemical Society 2015 ACS NANO Vol.9 No.3
<P>We have investigated the effects of a directly nanopatterned active layer on the electrical and optical properties of inverted polymer solar cells (i-PSCs). The capillary force in confined molds plays a critical role in polymer crystallization and phase separation of the film. The nanoimprinting process induced improved crystallization and multidimensional chain alignment of polymers for more effective charge transfer and a fine phase-separation between polymers and [6,6]-phenyl-C<SUB>71</SUB>-butyric acid methyl ester (PC<SUB>71</SUB>BM) to favor exciton dissociation and increase the generation rate of charge transfer excitons. Consequently, the power conversion efficiency with a periodic nanostructure was enhanced from 7.40% to 8.50% and 7.17% to 9.15% in PTB7 and PTB7-Th based i-PSCs, respectively.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-3/nn506678a/production/images/medium/nn-2014-06678a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn506678a'>ACS Electronic Supporting Info</A></P>
Improved photovoltaic properties of polymer solar cells with a phenyl compound as an additive.
Jeong, Seonju,Woo, Sung-Ho,Lyu, Hong-Kun,Kim, Cham,Kim, Wook Hyun,Han, Yoon Soo American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.8
<P>A phenyl compound with electron withdrawing substituents, 3-fluoro-4-cyanophenol (FCP), was used as an additive in polymer solar cells with a P3HT [poly(3-hexyl thiophene)]:PCBM [[6,6]-phenyl-C61-butyric acid methyl ester] blend film. Under simulated solar illumination of AM 1.5 (100 mW/cm2), the devices fabricated using a P3HT:PCBM (1:0.9 w:w) layer blended with 5 wt% of FCP achieved an enhanced power conversion efficiency (PCE) of 4.8% due to the improved short circuit current and fill factor, as compared to reference cells with PCE = 4.1%. UV-visible absorption spectra, X-ray measurements and carrier mobility studies revealed that FCP facilitated the ordering of the P3HT chains, resulting in higher absorbance, larger crystal size, closer packing and enhanced hole mobility.</P>