Effects of Fluorination and Side Chain Branching on Molecular Conformation and Photovoltaic Performance of Donor–Acceptor Copolymers

Wood, Sebastian; Kim, Ji‐Hoon; Hwang, Do‐Hoon; Kim, Jinhyun

doi:10.1021/acs.chemmater.5b01503

Cited by 41 publications

(30 citation statements)

References 38 publications

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“…This led to a high hole mobility of 3.8 × 10 −3 cm 2 V −1 s and an improved PCE from 3.2% to 5.5%. On the other hand, fluorination of the BTz unit broke the planarity of the BDT‐T bond, and the PCE was reduced to 2.7% . In another report, two‐dimensional (2‐D) conjugated BDT(X) (with X = thiophene or selenium) units were synthesized by the addition of lithiated 2‐(2‐ethylhexyl)aryl on benzodithiophene‐4,8‐dione, affording two new copolymers P102 and P103 .…”

Section: Wbg Copolymersmentioning

confidence: 99%

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

2017

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The past decade has witnessed significant advances in the field of organic solar cells (OSCs). Ongoing improvements in the power conversion efficiency of OSCs have been achieved, which were mainly attributed to the design and synthesis of novel conjugated polymers with different architectures and functional moieties. Among various conjugated polymers, the development of wide-bandgap (WBG) polymers has received less attention than that of low-bandgap and medium-bandgap polymers. Here, we briefly summarize recent advances in WBG polymers and their applications in organic photovoltaic (PV) devices, such as tandem, ternary, and non-fullerene solar cells. Addtionally, we also dissuss the application of high open-circuit voltage tandem solar cells in PV-driven electrochemical water dissociation. We mainly focus on the molecular design strategies, the structure-property correlations, and the photovoltaic performance of these WBG polymers. Finally, we extract empirical regularities and provide invigorating perspectives on the future development of WBG photovoltaic materials.

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Section: Wbg Copolymersmentioning

confidence: 99%

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

2017

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“…It is hoped that more general rules and a comprehensive understanding will emerge from ongoing study. [86,88,89] 3.1.2. Side Group Modification It has already been noted that the optoelectronic properties of conjugated molecules are largely determined by the structure of the conjugated part of the molecule, whereas the side chains are primarily intended as solubilising groups for ease of processing.…”

Section: Heteroatom Substitution and Fluorinationmentioning

confidence: 99%

Raman spectroscopy as an advanced structural nanoprobe for conjugated molecular semiconductors

Wood¹,

Hollis²,

Kim³

2017

J. Phys. D: Appl. Phys.

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Raman spectroscopy has emerged as a powerful and important characterisation tool for probing molecular semiconducting materials. The useful optoelectronic properties of these materials arise from the delocalised -electron density in the conjugated core of the molecule, which also results in large Raman scattering cross-sections and a strong coupling between its electronic states and vibrational modes. For this reason, Raman spectroscopy offers a unique insight into the properties of molecular semiconductors, including: chemical structure, molecular conformation, molecular orientation, and fundamental photo-and electro-chemical processes-all of which are critically important to the performance of a wide range of optical and electronic organic semiconductor devices. Experimentally, Raman spectroscopy is non-intrusive, non-destructive, and requires no special sample preparation, and so is suitable for a wide range of in situ measurements, which are particularly relevant to issues of thermal and photochemical stability. Here we review the development of the family of Raman spectroscopic techniques, which have been applied to the study of conjugated molecular semiconductors. We consider the suitability of each technique for particular circumstances, and the unique insights it can offer, with a particular focus on the significance of these measurements for the continuing development of stable, high performance organic electronic devices.

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“…Benzodithiophene (BDT) as donor unit was added to NT to form donor–acceptor polymers with a lower band gap . In addition, thanks to its high planar structure, weak steric hindrance between neighboring units and easy functionalization by alkylthio and triisopropylsilylethynyl (TIPS), BDT is one of the most promising donor moieties to reach excellent photovoltaic characteristics. Moreover, the bis(didecylthien‐2‐yl)dithienobenzodithiophene (DTBDT‐T) with pentacyclic aromatic lactam of N , N ‐didodecylthieno‐pyrido‐thieno‐isoquinoline‐dione (TPTI) exhibited comparable photostability to P3HT .…”

Section: Introductionmentioning

confidence: 99%

Well‐functioned photovoltaics based on nanofibers composed of PBDT‐TIPS‐DTNT‐DT and graphenic precursors thermally modified by polythiophene, polyaniline and polypyrrole

Agbolaghi

2019

Polymer International

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Reduced graphene oxide nanosheets modified by conductive polymers including polythiophene (GPTh), polyaniline (GPANI) and polypyrrole (GPPy) were prepared using the graphene oxide as both substrate and chemical oxidant. UV-visible and Raman analyses confirmed that the graphene oxide simultaneously produced the reduced graphene oxide and polymerized the conjugated polymers. The prepared nanostructures were subsequently electrospun in mixing with poly(3-hexylthiophene) (P3HT)/phenyl-C71-butyric acid methyl ester (PC 71 BM) and poly[bis(triisopropylsilylethynyl) benzodithiophene-bis(decyltetradecylthien)naphthobisthiadiazole] (PBDT-TIPS-DTNT-DT)/PC71 BM components and embedded in the active layers of photovoltaic devices to improve the charge mobility and efficiency. The GPTh/PBDT-TIPS-DTNT-DT/PC 71 BM devices demonstrated better photovoltaic features (J sc = 11.72 mA cm −2 , FF = 61%, V oc = 0.68 V, PCE = 4.86%, h = 8.7 × 10 −3 cm 2 V -1 s −1 and e = 1.3 × 10 −2 cm 2 V -1 s −1 ) than the GPPy/PBDT-TIPS-DTNT-DT/PC 71 BM (J sc = 10.30 mA cm −2 , FF = 60%, V oc = 0.66 V, PCE = 4.08%, h = 1.4 × 10 −3 cm 2 V -1 s −1 and e = 8.9 × 10 −3 cm 2 V -1 s −1 ) and GPANI/PBDT-TIPS-DTNT-DT/PC 71 BM (J sc = 10.48 mA cm −2 , FF = 59%, V oc = 0.65 V, PCE = 4.02%, h = 8.6 × 10 −4 cm 2 V -1 s −1 and e = 7.8 × 10 −3 cm 2 V -1 s −1 ) systems, assigned to the greater compatibility of PTh in the nano-hybrids and the thiophenic conjugated polymers in the bulk of the nanofibers and active thin films. Furthermore, the PBDT-TIPS-DTNT-DT polymer chains (3.35%-5.04%) acted better than the P3HT chains (2.01%-3.76%) because of more complicated conductive structures.

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Effects of Fluorination and Side Chain Branching on Molecular Conformation and Photovoltaic Performance of Donor–Acceptor Copolymers

Cited by 41 publications

References 38 publications

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

Recent Advances in Wide‐Bandgap Photovoltaic Polymers

Raman spectroscopy as an advanced structural nanoprobe for conjugated molecular semiconductors

Well‐functioned photovoltaics based on nanofibers composed of PBDT‐TIPS‐DTNT‐DT and graphenic precursors thermally modified by polythiophene, polyaniline and polypyrrole

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