Self n-doped [6,6]-phenyl-C61-butyric acid 2-((2-(trimethylammonium)ethyl)-(dimethyl)ammonium) ethyl ester diiodides as a cathode interlayer for inverted polymer solar cells

Jiao, Weixiang; Ma, Di; Lv, Menglan; Chen, Weiwei; Wang, Haiqiao; Zhu, Jin; Lei, Ming; Chen, Xiwen

doi:10.1039/c4ta02682a

Cited by 41 publications

(25 citation statements)

References 73 publications

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“…A large number of suitable interfacial materials for PSCs have been reported, such as metal complexes 17 , organic-inorganic composite 18 19 20 , graphene derivatives 21 22 , nanoparticle clusters 23 , and most importantly, alcohol-soluble conjugated polymers 10 . Alcohol-soluble conjugated polymers had already been used as the interlayers for organic light emitting diodes (OLEDs) in recently years 24 25 26 .…”

mentioning

confidence: 99%

Alcohol-soluble Star-shaped Oligofluorenes as Interlayer for High Performance Polymer Solar Cells

Zou

Zhao

et al. 2015

Sci Rep

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Two star-shaped oligofluorenes with hexakis(fluoren-2-yl)benzene as core are designed and sythesized for interfacial materials in polymer solar cell. Diethanolamino groups are attached to the side chain of fluorene units for T0-OH and T1-OH to enable the alcohol solubility, and additional hydrophobic n-hexyl chains are also grafted on the increased fluorene arms for T1-OH. In conventional device with PCDTBT/PC71BM as active layer, a 50% enhanced PCE is obtained by incorporating T0-OH and T1-OH as the interlayer compared with device without interlayer. By optimizing the active material with PTB7 and with the inverted device structure, a maximum PCE of 9.30% is achieved, which is among the highest efficiencies for PTB7 based polymer solar cells. The work function of modified electrode, the surface morphology and the suraface properties are systematically studied. By modifying the structures of the star-shaped molecules, a balance between the hydrophobic and hydrophilic property is finely tuned, and thus facilitate the interlayer for high performance of PSCs.

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mentioning

confidence: 99%

Alcohol-soluble Star-shaped Oligofluorenes as Interlayer for High Performance Polymer Solar Cells

Zou

Zhao

et al. 2015

Sci Rep

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“…9 In a previous study by our group, we examined solution phase reduction of C 60 using TBAF and observed reduced species that gave rise to UV--vis--NIR spectra, like those observed in studies of tetrabutlyammonium salts and FPI. Direct electron transfer is not the only mechanism by which anions could result in an increased conductivity.…”

Section: Reduction Level and Conductivity Of Pristine Nmfp--br Filmsmentioning

confidence: 81%

Limits on anion reduction in an ionically functionalized fullerene by cyclic voltammetry with in situ conductivity and absorbance spectroscopy

Bradley

Lonergan

2016

J. Mater. Chem. A

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Electron selective interfacial layers are necessary for the production of efficient organic and lead halide perovskite solar cells. Recently it has been asserted that ion--containing fullerene--based interfacial layers with high conductivities are self n-doped by anion reduction. In this study, dual--electrode spectroelectrochemistry is employed to determine the relationship between reduction level, conductivity, and in conjunction with absorbance spectroscopy the initial level of reduction of films of an ion containing fullerene, N,N,N--trimethyl--5--(N--methyl--3,4--[60]fulleropyrrolidin--2--yl)pentan--1--aminium bromide (NMFP--Br). We calculate an extinction coefficient at λmax of 5x10 3 M --1 cm --1 and a maximum conductivity of 6.1x10 --2 S cm --1 at 40% of maximum reduction. We determine that anion--induced reduction is not occurring to a significant extent in pristine films of NMFP--Br. We also observe that the conductivity of electrochemically reduced NMFP--Br is consistent with a mixed--redox conduction mechanism. These results, with consideration of commonly reported conductivities and mobilities, are useful in understanding why ion--containing fullerene films are initially highly conductive.

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“…However, the optimized device with an ultrathin ETL thickness (≈10 nm) cannot meet the requirement of large‐area fabrication technology. To address this issue, Chen and co‐workers developed a series of fullerene derivatives (PCBANI, PCBDANI, and PCBDANBr) using n‐type self‐doping strategy. They found that incorporating different number of ammonium salts and types of counter ions can effectively tune the electronic properties of fullerene derivatives.…”

Section: Interface Layer Materialsmentioning

confidence: 99%

Organic Solar Cell Materials toward Commercialization

Xue

Zhang

et al. 2018

Small

278

195

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Bulk-heterojunction organic solar cells (OSCs) have received considerable attention with significant progress recently and offer a promising outlook for portable energy resources and building-integrated photovoltaics in the future. Now, it is urgent to promote the research of OSCs toward their commercialization. For the commercial application of OSCs, it is of great importance to develop high performance, high stability, and low cost photovoltaic materials. In this review, a comprehensive overview of the fundamental requirements of photoactive layer materials and interface layer materials toward commercialization is provided, mainly focusing on high performance, green manufacturing, simplifying device fabrication processes, stability, and cost issues. Furthermore, the perspectives and opportunities for this emerging field of materials science and engineering are also discussed.

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Self n-doped [6,6]-phenyl-C61-butyric acid 2-((2-(trimethylammonium)ethyl)-(dimethyl)ammonium) ethyl ester diiodides as a cathode interlayer for inverted polymer solar cells

Abstract: Among alcohol soluble self n-doped fullerene ammonium derivatives, the title fullerene showed the best solvent resistance and inverted polymer solar cells retained high efficiency at 82 nm of this interlayer.

Cited by 41 publications

References 73 publications

Alcohol-soluble Star-shaped Oligofluorenes as Interlayer for High Performance Polymer Solar Cells

Alcohol-soluble Star-shaped Oligofluorenes as Interlayer for High Performance Polymer Solar Cells

Limits on anion reduction in an ionically functionalized fullerene by cyclic voltammetry with in situ conductivity and absorbance spectroscopy

Organic Solar Cell Materials toward Commercialization

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