nz9b01819_si_001.pdf (1.57 MB)
High-Performance and Stable Nonfullerene Acceptor-Based Organic Solar Cells for Indoor to Outdoor Light
journal contribution
posted on 2019-12-13, 15:40 authored by Sungmin Park, Hyungju Ahn, Ji-yeong Kim, Jong Baek Park, Junghwan Kim, Sang Hyuk Im, Hae Jung SonWe synthesized a donor polymer of bis(2-ethylhexyl)thiophene-substituted
benzodithiophene (BDT-Th) and 1,3-bis(2-ethylhexyl)-5,7-di(thiophene-2-yl)benzo[1,2-c:4,5-c′]dithiophene-4,8-dione,
for which the BDT-Th unit includes chlorine and sulfur-bridged 2-ethylhexyl
in the thiophene side group. When compared with PBDB-TF, which includes
fluorine and 2-ethylhexyl in BDT-Th, PBDB-TSCl shows more efficient
exciton dissociation and charge generation, which is probably because
large dipole moment changes from ground to excited states lead to
reduced exciton binding energy. Consequently, despite a small donor–acceptor
interface in the bulk heterojunction (BHJ) film, PBDB-TSCl achieves
higher photovoltaic performance than PBDB-TF under various light intensities;
PBDB-TSCl achieved higher efficiency (13.13%) than the 12.12% of PBDB-TF
under 1 sun illumination. Moreover, PBDB-TSCl showed the highest efficiency
of 21.53% with fill factor (FF) of 76.29% under a 500 lx fluorescence
lamp, whereas PBDB-TF has lower efficiency of 15.57% with FF of 65.25%.
Furthermore, the PBDB-TSCl device shows improved thermal stability
due to the more stabilized morphology of its BHJ film.
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BHJ filmPBDB-TFOutdoor Lightsulfur-bridged 2- ethylhexylexciton binding energybulk heterojunctionexciton dissociation1 sun illuminationefficiency500 lx fluorescence lamp2- ethylhexyldonor polymerBDT-Th unitFFPBDB-TSCl deviceStable Nonfullerene Acceptor-Based Organic Solar Cellslight intensitiesthiophene side groupcharge generationmoment changesphotovoltaic performance
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