title: High-performance inverted tandem polymer solar cells utilizing thieno[3,4-c]pyrrole-4,6-dione copolymer.
abstract: 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-b:4,5-b']dithiophene-co-octylthieno[3,4-c]pyrrole-4,6-dione):[6,6]-phenyl-C61 butyric acid methyl ester (PBDTTPD:PC61BM) and poly[(4,4'-bis(2-ethylhexyl)dithieno[3,2-b:2',3'-d] silole)-2,6-diyl-alt-(2,1,3-benzothiadiazole)-4,7-diyl]:[6,6]-phenyl-C70 butyric acid methyl ester (PSBTBT:PC70BM) 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 (Voc) of 1.54 V, a short circuit current density (Jsc) of 7.55 mA/cm(2), and a fill factor (FF) of 64.79% along with the power conversion efficiency of 7.53%. The Voc value of our tandem solar cells is an ideal summation of Voc values from front and rear subcells.
authors: Department of Information, Display and Advanced Display Research Center, Kyung Hee University , Dongdaemun-ku, Seoul 130-171, Republic of Korea.
authors: Abd Rashid bin Mohd
authors: AR
authors: Yusoff
authors: Seung Joo
authors: SJ
authors: Lee
authors: Jaeyeon
authors: J
authors: Kim
authors: Fabio Kurt
authors: FK
authors: Shneider
authors: Wilson Jose
authors: WJ
authors: da Silva
authors: Jin
authors: J
authors: Jang