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Effect of Dihydronaphthyl-based C60 Bisadduct as Third Component Materials on the Photovoltaic Performance and Charge Carrier Recombination of Binary PBDB-T:ITIC Polymer Solar Cells

Abstract

A dihydronaphthyl-based C60 bisadduct (NCBA) acceptor is introduce as a third component to typical poly[(2,6-(4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)-benzo[1,2-b:4,5-b0]dithiophene))-alt-(5,5-(10,30-di-2-thienyl-50,70-bis(2-ethylhexyl)benzo[10,20-c:40,50-c0]dithiophene-4,8-dione))] (PBDB-T): 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:20,30-d0]-s-indaceno[1,2-b:5,6-b0]-dithiophene (ITIC) binary polymer solar cells (PSCs). NCBA play bridging role between the lowest unoccupied molecular orbital (LUMO) of PBDB-T and ITIC and provides more routes for charge carrier transfer at the interface between PBDB-T and ITIC, a higher open-circuit voltage (VOC) realize upon addition of NCBA can be achieve relative to the neat ITIC as an electron acceptor. The strong visible light absorption in the range from 300 to 520 nm of NCBA molecule, it has the effect of apparently complementary visible light absorption compare with the binary PBDB-T:ITIC layer. The crystallinity and surface morphology of the PBDB-T:NCBA:ITIC (1:0.1:0.9) thin films is similar to that of the binary PBDB-T:ITIC layer, which guarantees suitable efficient exciton dissociation and charge carrier transport. The photocurrent density versus effective voltage (Jph-Veff) curves, short circuit current density (JSC) and VOC as a function of incident light intensity, and transient photovoltage (TPV) and transient photocurrent (TPC) were measure, and the results illustrate the effect of NCBA as the third component materials in terms of efficient exciton dissociation and weaken charge carrier recombination and loss. The PBDB-T:NCBA:ITIC (1:0.1:0.9)-based PSCs is show the optimized PCE value of 9.56% and better thermal stability after 10 h thermal annealing treatment (the normalized PCE value is 92.5 of the initial PCE value).

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Supplementary files

Publication details

The article was received on 09 Mar 2018, accepted on 09 Apr 2018 and first published on 09 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR01969J
Citation: Nanoscale, 2018, Accepted Manuscript
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    Effect of Dihydronaphthyl-based C60 Bisadduct as Third Component Materials on the Photovoltaic Performance and Charge Carrier Recombination of Binary PBDB-T:ITIC Polymer Solar Cells

    S. Niu, Z. Liu and N. Wang, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR01969J

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