Counterion-tunable n-type conjugated polyelectrolytes for the interface engineering of efficient polymer solar cells

Chen, Zhiming; Hu, Zhicheng; Wu, Zhihong; Liu, Xiang; Jin, Yaocheng; Xiao, Manjun; Huang, Fei; Cao, Yong

doi:10.1039/c7ta05246d

Cited by 38 publications

(31 citation statements)

References 57 publications

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“…To inspect the performance of the devices with the BHJ and PB architectures, the OSCs were fabricated based on the spin-coating method with a device configuration of indium tin oxide (ITO) glass/poly(3,4-ethylenedioxythiophene): polystyrene sulfonate (PEDOT:PSS)/PM6:N3:PC 71 BM /poly[[2,7-bis(2-ethylhexyl)-1,2,3,6,7,8-hexahydro-1,3,6,8-tetraoxobenzo[lmn][3,8] phenanthroline-4,9-diyl]-2,5-thiophenediyl[9,9-bis[3-(dimethylamino)propyl]-9H-fluorene-2,7-diyl]-2,5-thiophenediyl] (PNDIT-F3N) 43 /Ag (Fig. 3a ).…”

Section: Resultsmentioning

confidence: 99%

Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

et al. 2021

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Solution-processed organic solar cells (OSCs) are a promising candidate for next-generation photovoltaic technologies. However, the short exciton diffusion length of the bulk heterojunction active layer in OSCs strongly hampers the full potential to be realized in these bulk heterojunction OSCs. Herein, we report high-performance OSCs with a pseudo-bilayer architecture, which possesses longer exciton diffusion length benefited from higher film crystallinity. This feature ensures the synergistic advantages of efficient exciton dissociation and charge transport in OSCs with pseudo-bilayer architecture, enabling a higher power conversion efficiency (17.42%) to be achieved compared to those with bulk heterojunction architecture (16.44%) due to higher short-circuit current density and fill factor. A certified efficiency of 16.31% is also achieved for the ternary OSC with a pseudo-bilayer active layer. Our results demonstrate the excellent potential for pseudo-bilayer architecture to be used for future OSC applications.

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Section: Resultsmentioning

confidence: 99%

Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

et al. 2021

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“…23 It has been reported that the counter anions of electron-transport materials showed different behaviors in OSCs. 64,65 Because these alkali carbonates possess different metal ions, especially the sizes of these metal ions are different, the different behaviors in our iOSCs are expected. Compared to (Li 2 CO 3 and K 2 CO 3 ), Rb 2 CO 3 possess the biggest size of metal ions of Rb, thus Rb 2 CO 3 can form the strongest interaction (M–O–A) in SnO 2 /alkali carbonate samples, which is a clear evidence which elucidates that the performance of iOSCs using SnO 2 /Rb 2 CO 3 showed the best average PCEs (7.35%).…”

Section: Resultsmentioning

confidence: 99%

Modified SnO₂ with Alkali Carbonates as Robust Electron-Transport Layers for Inverted Organic Solar Cells

et al. 2018

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We report for the first time that alkali carbonates (Li 2 CO 3 , K 2 CO 3 , and Rb 2 CO 3 ) based on a low-temperature solution process can be used as interfacial modifiers for SnO 2 as robust electron-transport layers (ETL) for inverted organic solar cells (iOSCs). The room-temperature photoluminescence, the electron-only devices, and the impedance studies altogether suggested the interfacial properties of the alkali carbonates–modified SnO 2 ETLs, which were much better than those based on the SnO 2 only, provided efficient charge transport, and reduced the charge recombination rates for iOSCs. The iOSCs using the polymer donor poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2- b ;4,5- b ′]dithiophene-2,6-diyl- alt -(4-(2-ethylhexyl)-3-fluorothieno[3,4- b ]thiophene-)-2-carboxylate-2-6-diyl] and the fullerene acceptor phenyl-C 70 -butyric acid methyl ester as the active layer showed the average power-conversion efficiencies (PCEs) based on ten devices of 6.70, 6.85, and 7.35% with Li 2 CO 3 -, K 2 CO 3 -, and Rb 2 CO 3 -modified SnO 2 as ETLs, respectively; these are more than 22, 24, and 33% higher than those based on the SnO 2 only (5.49%). Moreover, these iOSC devices exhibited long-term stabilities, with over 90% PCEs remaining after the devices were stored in ambient air for 6 weeks without encapsulations. We believe that alkali carbonates–modified SnO 2 approaches are an effective way to achieve stable and highly efficient iOSCs and might also be suitable for other optoelectronic devices where an ETL is needed, such as perovskite solar cells or organic light-emitting diodes.

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“…This phenomenon can be explained by the poor electron‐donating capability of BArF 4 − because of its large and electron‐withdrawing ArF 4 group, which hinders electron transfer from BArF 4 − to the backbone of PFBP–BArF 4 . [ 41 ] The absorption spectra of these CPEs in thin‐film state were slightly redshifted in comparison with those in solution (Figure 1b). The polaron absorption peak of PFBP–Br and PFBP–I in thin‐film state becomes more prominent compared to those in solution, indicating these CPEs are strongly n‐doped.…”

Section: Resultsmentioning

confidence: 99%

“…It can be found that a slight addition (0.3–0.6 wt% of PFBP–Br) of TBAF can largely trigger the formation of polaron absorption due to the stronger Lewis basicity of F − . [ 41 ] PFBP–Br with TBACl (35–70 wt% of PFBP–Br) can also enable enhanced polaron absorption. However, PFBP–BArF 4 exhibited much lower ESR intensity in comparison with that of PFBP–Br and PFBP–I, indicating the less doping in the conjugated backbone of PFBP–BArF 4 , which is consistent with the aforementioned absorption spectrum of PFBP–BArF 4 .…”

Section: Resultsmentioning

confidence: 99%

Aldol Condensation‐Polymerized n‐Doped Conjugated Polyelectrolytes for High‐Performance Nonfullerene Polymer Solar Cells

et al. 2020

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Doping provides an efficient strategy to control the electronic properties of organic semiconductors. However, compared with the widely reported p-type doping protocols, n-type doping of organic semiconductors still remains a challenge. Herein, a series of novel n-doped conjugated polyelectrolytes (CPEs) with high doping levels and conductivity are designed. These CPEs are synthesized via a facile, metal-free, and high-yield aldol condensation protocol from bis-isatin and bis-oxindole monomers. The designed CPEs possess a n-type electron-deficient and rigid conjugated backbone, resulting in easy charge delocalization, enhanced n-doping behaviors, and high conductivity. The evolution on the counterions of these CPEs further alters their n-doping behaviors, charge transporting properties, and work function tunability, etc. By using these CPEs as electron transport materials (ETMs) for nonfullerene polymer solar cells (NF-PSCs), high power conversion efficiencies (PCEs) over 16% can be achieved when PM6:Y6 is used as the active component. Moreover, these CPEs can enable efficient NF-PSCs even if their thicknesses are up to 60 nm, indicating the potential of these CPEs as thickness-insensitive ETMs for the fabrication of large-area NF-PSCs.

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Counterion-tunable n-type conjugated polyelectrolytes for the interface engineering of efficient polymer solar cells

Abstract: We report a series of counterion-tunable n-type conjugated polyelectrolytes for the interface engineering of polymer solar cells.

Cited by 38 publications

References 57 publications

Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

Modified SnO₂ with Alkali Carbonates as Robust Electron-Transport Layers for Inverted Organic Solar Cells

Aldol Condensation‐Polymerized n‐Doped Conjugated Polyelectrolytes for High‐Performance Nonfullerene Polymer Solar Cells

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Counterion-tunable n-type conjugated polyelectrolytes for the interface engineering of efficient polymer solar cells

Abstract: We report a series of counterion-tunable n-type conjugated polyelectrolytes for the interface engineering of polymer solar cells.

Cited by 38 publications

References 57 publications

Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

Pseudo-bilayer architecture enables high-performance organic solar cells with enhanced exciton diffusion length

Modified SnO2 with Alkali Carbonates as Robust Electron-Transport Layers for Inverted Organic Solar Cells

Aldol Condensation‐Polymerized n‐Doped Conjugated Polyelectrolytes for High‐Performance Nonfullerene Polymer Solar Cells

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Modified SnO₂ with Alkali Carbonates as Robust Electron-Transport Layers for Inverted Organic Solar Cells