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Giridhar, Thota,Saravanan, Chinnusamy,Cho, Woosum,Park, Young Geun,Lee, Jin Yong,Jin, Sung-Ho The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.30
<P>An oxadiazole based electron transporting (ET) unit was glued to the heteroleptic Ir(<SMALL>III</SMALL>) complex (<B>TPQIr-ET</B>) and used as a dopant for phosphorescent organic light-emitting diodes (PhOLEDs). It shows superior device performance than the dopant without the ET unit (<B>TPQIr</B>) due to the balanced charge carrier injection by the ET unit.</P> <P>Graphic Abstract</P><P>An oxadiazole based electron transporting (ET) unit was linked to the heteroleptic Ir(<SMALL>III</SMALL>) complex and used as a dopant for solution-processed PhOLEDs, which shows a superior device performance than the dopant without the ET unit. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c3cc49796h'> </P>
Lee, Changyeon,Giridhar, Thota,Choi, Joonhyeong,Kim, Seonha,Kim, Youngwoong,Kim, Taesu,Lee, Wonho,Cho, Han-Hee,Wang, Cheng,Ade, Harald,Kim, Bumjoon J. American Chemical Society 2017 Chemistry of materials Vol.29 No.21
<P>We delineate the important role of 2D conjugated alkylthiophene side chains of polymers in manipulating the molecular orientation and ordering at the polymer donor/polymer acceptor (<I>P</I><SUB>D</SUB>/<I>P</I><SUB>A</SUB>) interface as well as the composition variations in the blend active layer of all-polymer solar cells (all-PSCs). To systematically investigate the impact of 2D conjugated side chains on the performance of all-PSCs, we synthesized a series of poly(benzo[1,2-<I>b</I>:4,5-<I>b</I>̀]-dithiophene-thieno[3,4-<I>c</I>]pyrrole-4,6-dione) (PBDTTPD) polymer donors with different contents of alkoxy and alkylthiophene side chains, from 0 to 100% (PBDT-TPD (<B>P1</B>, 100% alkoxy side chain), PBDTT<SUB>0.29</SUB>-TPD (<B>P2</B>), PBDTT<SUB>0.59</SUB>-TPD (<B>P3</B>), PBDTT<SUB>0.76</SUB>-TPD (<B>P4</B>), and PBDTT-TPD (<B>P5</B>, 100% alkylthiophene side chain). The <B>P1</B>–<B>P5</B> polymer donors produced similar PCEs of ∼6% in fullerene-based PSCs. In contrast, for the all-PSC systems, the changes in the side chain composition of the polymers induced a strong increasing trend in the power conversion efficiencies (PCEs), from 2.82% (<B>P1</B>), to 3.16% (<B>P2</B>), to 4.41% (<B>P3</B>), to 5.32% (<B>P4</B>), and to 6.60% (<B>P5</B>). The significant increase in the PCEs of the all-PSCs was attributed mainly to improvements in the short-circuit current density (<I>J</I><SUB>SC</SUB>) and fill factor (FF). The 2D conjugated side chains promoted localized molecular orientation and ordering relative to the <I>P</I><SUB>D</SUB>/<I>P</I><SUB>A</SUB> interfaces and improved domain purity, which led to enhanced exciton dissociation and charge transport characteristics of the all-PSCs. Our observations highlight the advantage of incorporating 2D conjugated side chains into polymer donors for producing high-performance all-PSC systems.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2017/cmatex.2017.29.issue-21/acs.chemmater.7b03495/production/images/medium/cm-2017-03495e_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm7b03495'>ACS Electronic Supporting Info</A></P>