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Boosting Up Performance of Inverted Photovoltaic Cells from Bis(alkylthien-2-yl)dithieno[2,3‑d:2′,3′‑d′]benzo[1,2‑b:4′,5′‑b′]di thiophene-Based Copolymers by Advantageous Vertical Phase Separation
journal contribution
posted on 2017-03-09, 00:00 authored by Pengzhi Guo, Guoping Luo, Qiang Su, Jianfeng Li, Peng Zhang, Junfeng Tong, Chunyan Yang, Yangjun Xia, Hongbin WuThe
photovoltaic cells (PVCs) from conjugated copolymers of PDTBDT-BT
and PDTBDT-FBT with 5,10-bis(4,5-didecylthien-2-yl)dithieno[2,3-d:2′,3′-d′]benzo[1,2-b:4,5-b′]dithiophene as electron
donor moieties and benzothiadiazole and/or 5,6-difluorobenzothiadiazole
as electron acceptor moieties are optimized by employing alcohol-soluble
PFN (poly(9,9-bis(3′-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene))
as cathode modification interlayer. The power conversion efficiencies
(PCEs) of inverted PVCs (i-PVCs) from PDTBDT-BT and
PDTBDT-FBT with devices configuration as ITO/PFN/active layer/MoO3/Ag are increased from 4.97% to 8.54% and 5.92% to 8.74%,
in contrast to those for the regular PVCs (r-PVCs)
with devices configuration as ITO/PEDOT:PSS/active layer/Ca/Al under
100 mW/cm2 AM 1.5 illumination. The optical modeling calculations
and X-ray photoelectron spectroscopy (XPS) investigations reveal that
the r-PVCs and i-PVCs from the copolymers
exhibit similar light harvesting characteristics, and the enhancements
of the PCEs of the i-PVCs from the copolymers are
mainly contributed to the favorable vertical phase separation as the
strongly polymer-enriched top surface layers and slightly PC71BM (phenyl-C71-butyric acid methyl ester)-enriched bottom
surface layers are correspondingly connected to the anodes and cathodes
of the i-PVCs, while they are opposite in the r-PVCs. As we known, it is the first time to experimentally
verify that the i-PVCs with alcohol-soluble conjugated
polymers cathode modification layers enjoy favorable vertical phase
separation.
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XPSPDTBDT-FBTdevices configurationInverted Photovoltaic Cellspower conversion efficienciesPCEpolymers cathode modification layerslight harvesting characteristicsPC 71 BMAdvantageous Vertical Phase SeparationPDTBDT-BTelectron acceptor moietiesphase separationITOelectron donor moietiescathode modification interlayerAMX-ray photoelectron spectroscopyPFN
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