Influence of alkyl side-chain length on the carrier mobility in organic semiconductors: herringbone vs. pi–pi stacking

2016 ◽  
Vol 4 (20) ◽  
pp. 4546-4555 ◽  
Author(s):  
Zhiying Ma ◽  
Hua Geng ◽  
Dong Wang ◽  
Zhigang Shuai
Keyword(s):  
Chain Length ◽  
Organic Semiconductors ◽  
Carrier Mobility ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
Charge Mobility ◽  
Pi Stacking ◽  
Change Trend

With the increase of alkyl chain length, the change trend of charge mobility is reversed between π–π and herringbone systems.

scholarly journals Mapping the Side-Chain Length of Small Molecule Acceptors towards the Optimal Hierarchical Morphology in Ternary Organic Solar Cells

2021 ◽  
Author(s):  
Zichun Zhou ◽  
Shengjie Xu ◽  
Xiaozhang Zhu
Keyword(s):  
Chain Length ◽  
Small Molecule ◽  
Organic Photovoltaics ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Electron Acceptors ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
Side Chain Length ◽  
Hierarchical Morphology

Hierarchical morphology has been clearly demonstrated to improve all performance parameters in ternary organic photovoltaics but shows strong dependence on the molecular structures. Here we develop four small molecule electron acceptors with different alkyl chain length to find the optimal solution of alkyl chain towards the defined hierarchical morphology and carry out a clear and comprehensive investigation of the alkyl chain length effects on the structure-morphology-device performance relationships in ternary blend. There is a positive correlation between the power conversion efficiencies of the four ternary systems and their short-circuit current density parameters, manifesting the significance of distinguishing optimal alkyl side chain length of small molecule electron acceptors for defined hierarchical morphology to afford efficient carrier generation. The non-optimal side chains would retard the BTR crystalline and make the PC<sub>71</sub>BM domain sizes incontrollable, leading to a morphology without a defined hierarchy. Such a detailed mapping of the alkyl side chain length of small molecule electron acceptors provide a new insight into the materials combinations for the next-step high performance multi-component organic photovoltaics

Molecular Requirements for Printable Organic Semiconductors in 7-Alkyl-2-phenyl[1]benzothieno[3,2-b][1]benzothiophenes (Ph-BTBT-Cn’s)

MRS Advances ◽  
2016 ◽  
Vol 1 (38) ◽  
pp. 2653-2658
Author(s):  
S. Inoue ◽  
H. Minemawari ◽  
J. Tsutsumi ◽  
T. Hamai ◽  
S. Arai ◽  
...  
Keyword(s):  
Chain Length ◽  
Organic Semiconductors ◽  
Field Effect ◽  
High Performance ◽  
Carrier Transport ◽  
Alkyl Chain ◽  
Field Effect Transistors ◽  
Systematic Investigation ◽  
Alkyl Chain Length

ABSTRACTHere we discuss requirements for high performance and solution processable organic semiconductors, by presenting a systematic investigation of 7-alkyl-2-phenyl[1]benzothieno[3,2-b][1]benzothiophenes (Ph-BTBT-Cn’s). We found that the solubility and thermal properties of Ph-BTBT-Cn’s depend systematically on the substituted alkyl-chain length n. The observed features are well understood in terms of the change of molecular packing motif with n: The compounds with n ≤ 4 do not form independent alkyl chain layers, whereas those with n ≥ 5 form isolated alkyl chain layers. The latter compounds afford a series of isomorphous bilayer-type crystal structures that form two-dimensional carrier transport layers within the crystals. We also show that the Ph-BTBT-C10 afford high performance single-crystalline field-effect transistors the mobility of which reaches as high as 15.9 cm2/Vs. These results demonstrate a crucial role of the substituted alkyl chain length for obtaining high performance organic semiconductors and field-effect transistors.

scholarly journals Naphthalimide end capped anthraquinone based solution-processable n-channel organic semiconductors: effect of alkyl chain engineering on charge transport

2018 ◽  
Vol 6 (14) ◽  
pp. 3774-3786 ◽  
Author(s):  
Thu-Trang Do ◽  
Yasunori Takeda ◽  
Sergei Manzhos ◽  
John Bell ◽  
Shizuo Tokito ◽  
...  
Keyword(s):  
Thin Film ◽  
Charge Transport ◽  
Small Molecules ◽  
Chain Length ◽  
Organic Semiconductors ◽  
Alkyl Chain ◽  
Thin Film Transistor ◽  
Alkyl Chain Length ◽  
Organic Thin Film ◽  
Organic Thin Film Transistor

A series of electron deficient small molecules using fused anthraquinone and naphthalimide conjugated backbone with different alkyl chain length with lower LUMO for n-channel organic thin film transistor.

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