Toward Eco-friendly Green Organic Semiconductors: Recent Advances in Spiro[fluorene-9,9′-xanthene] (SFX)-Based Optoelectronic Materials and Devices

2015 ◽  
Vol 33 (8) ◽  
pp. 815-827 ◽  
Author(s):  
Mingli Sun ◽  
Ruochen Xu ◽  
Linghai Xie ◽  
Ying Wei ◽  
Wei Huang
Keyword(s):  
Organic Semiconductors ◽  
Optoelectronic Materials ◽  
Recent Advances

Recent Advances in the Synthesis of Polyfluorenes as Organic Semiconductors

2004 ◽  
Vol 814 ◽  
Author(s):  
David J. Brennan ◽  
Yu Chen ◽  
Shaoguang Feng ◽  
James P. Godschalx ◽  
Gary E. Spilman ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Semiconductor Film ◽  
Melting Temperatures ◽  
Alternating Copolymers ◽  
Polymeric Semiconductor ◽  
Recent Advances ◽  
Thermal Cleavage ◽  
Switching Characteristics ◽  
Initial Results ◽  
Bottom Gate

AbstractNew poly(fluorene-thiophene) alternating copolymers are described in which either the dioctylfluorene or bithiophene units in poly(9,9-dioctylfluorene-alt-bithiophene) (F8T2) are replaced by other fluorene or thiophene-based groups, respectively. Improvements in solubility are realized when the bithiophene unit of F8T2 is replaced by dihexylterthiophene or dihexylpentathiophene units. Melting temperatures are also lowered by 50 – 100°C in these polymers when compared to F8T2. Replacement of the bithiophene unit of F8T2 with a dihexylpentathiophene unit also results in a significant improvement in hysteresis (< 2 V vs. 3.5 – 5 V for F8T2). Initial results are also reported on the thermal cleavage of the C8 side groups of F8T2, which yields an insoluble polymeric semiconductor film that continues to exhibit transistor switching characteristics as part of a bottom gate device.

Recent Advances in the Computational Characterization of π-Conjugated Organic Semiconductors

2019 ◽  
pp. 37-106
Author(s):  
Jean-Luc Bredas ◽  
Xiankai Chen ◽  
Thomas Körzdörfer ◽  
Hong Li ◽  
Chad Risko ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Recent Advances ◽  
Conjugated Organic Semiconductors

The carbon-carbon triple bond as a tool to design organic semiconductors for photovoltaic applications: an assessment of prospects and challenges

2021 ◽  
Author(s):  
Mirko Seri ◽  
Assunta Marrocchi
Keyword(s):  
Organic Semiconductors ◽  
Triple Bond ◽  
Research Focus ◽  
Recent Advances ◽  
Photovoltaic Applications ◽  
The Subject ◽  
Intense Research

Alkyne-containing organic semiconductors are once again becoming the subject of intense research focus, and recent advances have significantly enhanced their performance in optoelectronics. This perspective focuses on the results achieved...

Theoretical Investigation of Structural Effects on the Charge Transfer Properties in Modified Phthalocyanines

MRS Advances ◽  
2015 ◽  
Vol 1 (7) ◽  
pp. 453-458 ◽  
Author(s):  
Patrick J. Dwyer ◽  
Stephen P. Kelty
Keyword(s):  
Organic Semiconductors ◽  
Electron Affinity ◽  
Density Functional ◽  
Reorganization Energy ◽  
High Electron ◽  
Optoelectronic Materials ◽  
Research Attention ◽  
Efficient Charge ◽  
Reorganization Energies ◽  
P Type

ABSTRACTFor efficient charge separation and charge transport in optoelectronic materials, small internal reorganization energies are desired. While many p-type organic semiconductors have been reported with low internal reorganization energies, few n-type materials with low reorganization energy are known. Metal phthalocyanines have long received extensive research attention in the field of organic device electronics due to their highly tunable electronic properties through modification of the molecular periphery. In this study, density functional theory (DFT) calculations are performed on a series of zinc-phthalocyanines (ZnPc) with various degrees of peripheral per-fluoroalkyl (-C3F7) modification. Introduction of the highly electron withdrawing groups on the periphery leads to a lowering in the energy of the molecular frontier orbitals as well as an increase in the electron affinity. Additionally, all molecules studies are found to be most stable in their anionic form, demonstrating their potential as n-type materials. However, the calculated internal reorganization energy slightly increases as a function of peripheral modification. By varying the degree of modification we develop a strategy for obtaining an optimal balance between low reorganization energy and high electron affinity for the development of novel n-type optoelectronic materials.

Recent advances in organic near-infrared photodiodes

2018 ◽  
Vol 6 (14) ◽  
pp. 3499-3513 ◽  
Author(s):  
Xiaodong Liu ◽  
Yiwei Lin ◽  
Yingjie Liao ◽  
Jiazun Wu ◽  
Yonghao Zheng
Keyword(s):  
Electronic Properties ◽  
Organic Semiconductors ◽  
Near Infrared ◽  
Recent Advances ◽  
Infrared Photodiodes ◽  
Organic Photodetectors

Both broadband and narrowband organic photodetectors can be realized due to the easily tunable optical/electronic properties of organic semiconductors.

scholarly journals Exciton transport in molecular organic semiconductors boosted by transient quantum delocalization

2022 ◽  
Author(s):  
Samuele Giannini ◽  
Wei-Tao Peng ◽  
Lorenzo Cupellini ◽  
Daniele Padula ◽  
Antoine Carof ◽  
...  
Keyword(s):  
Organic Semiconductors ◽  
Diffusion Constant ◽  
Reorganization Energy ◽  
Clear Correlation ◽  
Optoelectronic Materials ◽  
Surface Hopping ◽  
Exciton Transport ◽  
Organic Optoelectronic Devices ◽  
Organic Optoelectronic ◽  
Quantum Delocalization

Abstract Designing molecular materials with very large exciton diffusion lengths would remove some of the intrinsic limitations of present-day organic optoelectronic devices. Yet, the nature of excitons in these materials is still not sufficiently well understood. Here we present Frenkel exciton surface hopping, a highly efficient method to propagate excitons through truly nano-scale materials by solving the time-dependent Schrödinger equation coupled to nuclear motion. We find a clear correlation between diffusion constant and quantum delocalization of the exciton. In materials featuring some of the highest diffusion lengths to date, e.g. the non-fullerene acceptor Y6, the exciton propagates via a transient delocalization mechanism, reminiscent to what was recently proposed for charge transport. Yet, the extent of delocalization is rather modest, even in Y6, and found to be limited by the relatively large exciton reorganization energy. On this basis we chart out a path for rationally improving exciton transport in organic optoelectronic materials.

scholarly journals Advances in applying C–H functionalization and naturally sourced building blocks in organic semiconductor synthesis

2021 ◽  
Author(s):  
Liwen Xing ◽  
Christine K. Luscombe
Keyword(s):  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Large Scale ◽  
Building Blocks ◽  
Scale Production ◽  
Recent Advances ◽  
Large Scale Production

This review presents the recent advances in the synthesis of organic semiconductors using C–H functionalization and naturally sourced building blocks to facilitate the large-scale production and commercialization of organic semiconductors.

Recent advances in luminescent metal-organic frameworks and their photonic applications

2021 ◽  
Author(s):  
Penghao Li ◽  
Zhonghao Zhou ◽  
Yong Sheng Zhao ◽  
Yongli Yan
Keyword(s):  
Metal Organic Frameworks ◽  
Optoelectronic Materials ◽  
Recent Advances ◽  
Metal Organic

In recent years, metal-organic frameworks (MOFs) are attracting ever more interest owing to their fascinating structures and widespread applications. Among presenting optoelectronic materials, luminescent MOFs (LMOFs) have become one of...

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