Ti-Oxo Clusters with Peripheral Alkyl Groups as Cathode Interlayers for Efficient Organic Solar Cells

Broadband-Solubility Diketopyrrolopyrrole Derivative with Both Polar Cyano and Nonpolar Alkyl Groups for Stable Organic Photosensors and Diffusion-Processed Organic Solar Cells

ChemistrySelect ◽

10.1002/slct.201600291 ◽

2016 ◽

Vol 1 (8) ◽

pp. 1716-1722 ◽

Cited By ~ 1

Author(s):

Hyena Lee ◽

Hyemi Han ◽

Jaehoon Jeong ◽

Hwajeong Kim ◽

Dong-Ik Song ◽

...

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Alkyl Groups ◽

And Diffusion

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Efficient Solar Cells Based on a Polymer Donor with β-Branching in Trialkylsilyl Side Chains

Organic Materials ◽

10.1055/s-0041-1726427 ◽

2021 ◽

Vol 03 (02) ◽

pp. 134-140

Author(s):

Haijun Bin ◽

Martijn M. Wienk ◽

René A. J. Janssen

Keyword(s):

Solar Cells ◽

Organic Solar Cells ◽

Short Circuit ◽

Energy Levels ◽

Short Circuit Current ◽

Open Circuit ◽

Side Chains ◽

Photovoltaic Properties ◽

Alkyl Groups ◽

High Efficient

Side-chain engineering is an important strategy in designing novel polymer semiconductor materials for high-efficient organic solar cells. The use of trialkylsilyl side chains can improve the photovoltaic efficiency by decreasing the energy of the HOMO of the polymer and improving its crystallinity and hole mobility. Compared to simple linear derivatives, α-branching in the alkyl groups of trialkylsilyl side chains causes strong aggregation and excessive phase separation in the photoactive layer, leading to poor device performance. β-Branching of the alkyl groups has not yet been used in trialkylsilyl side chains. Herein, we describe a new polymer (J77) with triisobutylsilyl side chains to investigate the effect of β-branching on the molecular aggregation, optical properties, energy levels, and photovoltaic properties. We find that compared to α-branching, β-branching of alkyl groups in trialkylsilyl side chains significantly reduces aggregation. This enables J77 to form blend morphologies in films that provide high-efficient solar cells in combination with different non-fullerene acceptors. Moreover β-branching of the alkyl groups in trialkylsilyl side chains lowers the HOMO energy level of J77 and increases the open-circuit voltage of J77-based solar cells without sacrificing short-circuit current density or fill factor.

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Effect of Alkyl Substituents on DPP‐based Small Molecules for Organic Solar Cells

Energy Storage ◽

10.1002/est2.165 ◽

2020 ◽

Author(s):

Seunggyun Hong ◽

Eunhee Lim

Keyword(s):

Solar Cells ◽

Small Molecules ◽

Organic Solar Cells

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An Efficient Imine Photocyclization as an Alternative to the Pictet-Spengler Reaction for the Synthesis of AzaBenzannulated Perylenediimide Dyes

10.26434/chemrxiv.11878086.v1 ◽

2020 ◽

Cited By ~ 2

Author(s):

Antoine Goujon ◽

Lou Rocard ◽

Thomas Cauchy ◽

Piétrick Hudhomme

Keyword(s):

Solar Cells ◽

Visible Light ◽

Organic Solar Cells ◽

Reaction Sequence ◽

Large Scope ◽

High Yields

AzaBenzannulated PDI (AzaBPDI) dyes were synthesized in high yields via a new reaction sequence involving an imine condensation followed by visible light-induced photocyclization. The large scope and efficiency of this alternative to the Pictet-Spengler reaction is demonstrated, and allows the easy preparation of dimeric AzaBPDI as potential non-fullerene acceptors for organic solar cells.

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Boron-Nitrogen Doped Dihydroindeno[1,2-b]fluorene Derivatives as Acceptors in Organic Solar Cells

10.26434/chemrxiv.8345516 ◽

2019 ◽

Author(s):

Matthew Morgan ◽

Maryam Nazari ◽

Thomas Pickl ◽

J. Mikko Rautiainen ◽

Heikki M. Tuononen ◽

...

Keyword(s):

Solar Cells ◽

Solar Cell ◽

Organic Solar Cells ◽

Organic Solar Cell ◽

Broad Absorption ◽

Nitrogen Doped ◽

Large Depth ◽

End Products ◽

Boron Nitrogen ◽

The Way

The electrophilic borylation of 2,5-diarylpyrazines results in the formation of boron-nitrogen doped dihydroindeno[1,2-<i>b</i>]fluorene which can be synthesized via mildly air-sensitive techniques and the end products handled readily under atmosphereic conditions. Through transmetallation via diarylzinc reagents a series of derivatives were sythesized which show broad absorption profiles that highlight the versatility of this backbone to be used in organic solar cell devices. These compounds can be synthesized in large yields, in alow number of steps and functionalized at many stages along the way providing a large depth of possibilities. Exploratory device paramaters were studied and show PCE of 2%.

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