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bin Mohd Yusoff, Abd. Rashid,Lee, Seung Joo,Kim, Jaeyeon,Shneider, Fabio Kurt,da Silva, Wilson Jose,Jang, Jin American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.15
<P>We demonstrated the inverted solution processed tandem polymer solar cells, in which transparent pH-neutral poly(3,4-ethylenedioxylenethiophene)–polystylene sulfonic acid (PEDOT:PSS) and lithium zinc oxide layers were used as a recombination layer. We have used poly(di(2-ethylhexyloxy)benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene-<I>co</I>-octylthieno[3,4-<I>c</I>]pyrrole-4,6-dione):[6,6]-phenyl-C<SUB>61</SUB> butyric acid methyl ester (PBDTTPD:PC<SUB>61</SUB>BM) and poly[(4,4′-bis(2-ethylhexyl)dithieno[3,2-<I>b</I>:2′,3′-<I>d</I>] silole)-2,6-diyl-<I>alt</I>-(2,1,3-benzothiadiazole)-4,7-diyl]:[6,6]-phenyl-C<SUB>70</SUB> butyric acid methyl ester (PSBTBT:PC<SUB>70</SUB>BM) as the active layers for front and rear subcells, respectively. The pH-neutral PEDOT:PSS/LZO serves as an electron- and hole-collecting and recombination layer. Our tandem solar cells showed a high open circuit voltage (<I>V</I><SUB>oc</SUB>) of 1.54 V, a short circuit current density (<I>J</I><SUB>sc</SUB>) of 7.55 mA/cm<SUP>2</SUP>, and a fill factor (FF) of 64.79% along with the power conversion efficiency of 7.53%. The <I>V</I><SUB>oc</SUB> value of our tandem solar cells is an ideal summation of <I>V</I><SUB>oc</SUB> values from front and rear subcells.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2014/aamick.2014.6.issue-15/am5029318/production/images/medium/am-2014-029318_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5029318'>ACS Electronic Supporting Info</A></P>
Yusoff, Abd. Rashid bin Mohd,Kim, Dongcheon,Kim, Hyeong Pil,Shneider, Fabio Kurt,da Silva, Wilson Jose,Jang, Jin The Royal Society of Chemistry 2015 Energy & environmental science Vol.8 No.1
<P>High efficiency, solution-deposited polymer inverted double- and triple-junction solar cells are demonstrated. The devices are composed of three distinctive photosensitive materials in three distinct subcells, with minimal absorption spectral overlap, and with a bandgap ranging from 1.3 eV to 1.82 eV. A transparent hybrid inorganic organic mixture was introduced as an interconnecting layer to optically and physically connect the subcells. Accordingly, a power conversion efficiency of 10.39% was attained for the double-junction cell and a record high of 11.83% was obtained for the triple-junction cell.</P> <P>Graphic Abstract</P><P>We propose that 1 + 1 + 1 triple-junction solar cells can provide an increased efficiency, as well as a higher open circuit voltage, compared to tandem solar cells. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4ee03048f'> </P>