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Tran, Hong Nhan,Kim, Do Hui,Park, Sujung,Cho, Shinuk ELSEVIER 2018 CURRENT APPLIED PHYSICS Vol.18 No.5
<P>We investigated the effect of three different additives (1-chloronaphthalene, 1,8-diiodooctane, diphenylether) on the performance of polymer-polymer solar cells based on a BHJ blend consisting 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) as a donor and poly[[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)] (P(NDI2OD-T2)) as an acceptor. A direct comparison of the efficiency of the solar cells with and without additive indicated that the device using the additive exhibited slightly improved performance. However, the efficiency enhancement was not significant. The optimal ratio of additive differed depending on the properties of the additive. In addition, the performances of polymer-polymer solar cells were not significantly dependent on the type of additive. Identifying the optimal fabrication condition was critical for achieving the highest performance. It is known that the general role of an additive in polymer solar cells based on a BHJ active layer was to induce good phase separation between the donor and acceptor by morphology modification. However, grazing-incidence wide-angle X-ray scattering results showed that no significant morphology change in polymer-polymer active layer was caused by the additive. Rather, our modulated impedance spectroscopy study showed that the performance enhancement in polymer-polymer solar cells with additive was because of improved recombination properties rather than improvements in crystalline morphology.</P>
Hong Nhan Tran,김도희,박수정,조신욱 한국물리학회 2018 Current Applied Physics Vol.18 No.5
We investigated the effect of three different additives (1-chloronaphthalene, 1,8-diiodooctane, diphenylether) on the performance of polymer-polymer solar cells based on a BHJ blend consisting 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) as a donor and poly[[N,N′-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)] (P(NDI2OD-T2)) as an acceptor. A direct comparison of the efficiency of the solar cells with and without additive indicated that the device using the additive exhibited slightly improved performance. However, the efficiency enhancement was not significant. The optimal ratio of additive differed depending on the properties of the additive. In addition, the performances of polymer-polymer solar cells were not significantly dependent on the type of additive. Identifying the optimal fabrication condition was critical for achieving the highest performance. It is known that the general role of an additive in polymer solar cells based on a BHJ active layer was to induce good phase separation between the donor and acceptor by morphology modification. However, grazing-incidence wide-angle X-ray scattering results showed that no significant morphology change in polymer-polymer active layer was caused by the additive. Rather, our modulated impedance spectroscopy study showed that the performance enhancement in polymer-polymer solar cells with additive was because of improved recombination properties rather than improvements in crystalline morphology.
Nho, Sungho,Kim, Do Hui,Park, Sujung,Tran, Hong Nhan,Lim, Bogyu,Cho, Shinuk Elsevier 2018 Dyes and pigments Vol.151 No.-
<P><B>Abstract</B></P> <P>Despite the great potential of carbazole and rhodanine moieties, donor molecule containing carbazole and rhodanine have received less attention because of their limited processability and poor efficiency. In this work, we synthesized a new donor molecule based on a combination of carbazole as a core-unit and rhodanine as an electron-withdrawing end-unit. We introduced diketopyrrolopyrrole as an additional acceptor at a position of π-linker to increase molecular planarity and the overall molecular weight. Our new donor molecule (named LGC-D073) showed a promising PCE value of 6.6% using chlorobenzene as a solvent. Moreover, LGC-D073 exhibited similar performances for both inverted and conventional structures. These results suggest that designing donor molecules with the combination of carbazole and rhodanine can be an efficient new approach to obtain high performance organic solar cells with improved processability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbazole and rhodanine based donor molecule was synthesized for organic solar cells. </LI> <LI> Improved processability was achieved from carbazole and rhodanine based donor molecule. </LI> <LI> New donor exhibited similar performances for both inverted and conventional structures. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Newly designed A-a-D-a-A structure donor molecule donor (LGC-D073) consisting of a carbazole as a core, a DPP as a π-linker, and a rhodanine as an end-unit exhibited good processability in chlorobenzene solvent together with almost comparable performance for inverted structure and conventional structure.</P> <P>[DISPLAY OMISSION]</P>