A potential naphtho[2,1-b:3,4-b′]dithiophene-based polymer with large open circuit voltage for efficient use in organic solar cells

Kim, Yu Jin; Cheon, Ye Rim; Jang, Jae-Wan; Kim, Yun‐Hi; Park, Jin Young

doi:10.1039/c4tc02597k

Cited by 14 publications

(5 citation statements)

References 53 publications

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“…405 °C, a desirable characteristic for OSC polymers . Interestingly, DSC thermograms (Figures b,c) showed no apparent thermal transition for 24PPTCT, implying that this polymer exists in an amorphous state at room temperature . In contrast, 29PPTCT, which contains an linear alkyl spacer (C6), showed distinct melting and crystallization transitions at 253 and 205 °C, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…23 Interestingly, DSC thermograms (Figures 1b,c) showed no apparent thermal transition for 24PPTCT, implying that this polymer exists in an amorphous state at room temperature. 24 In contrast, 29PPTCT, which contains an linear alkyl spacer (C6), showed distinct melting and crystallization transitions at 253 and 205 °C, respectively. This suggests that the relatively planar structure of 29PPTCT results in a lower degree of steric hindrance and less torsional interactions, which in turn result in stronger intermolecular π−π interactions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Effects of Alkyl Chain Length on the Optoelectronic Properties and Performance of Pyrrolo-Perylene Solar Cells

Liu

Kim

et al. 2015

ACS Appl. Mater. Interfaces

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While the impact of alkyl side-chain length on the photovoltaic properties of conjugated polymers and their performance in bulk heterojunction (BHJ) solar cells has been studied extensively, analogous studies on pyrrolo-perylene-based polymers have not received adequate attention. To explore these effects, we synthesized two copolymers based on N-annulated pyrrolo-perylene and consisting of cyano group substituents on thiophene vinylene thiophene units with two different alkyl groups of 2-decyltetradecyl and 7-decylnonadecyl, and we studied them with regard to chemical structure and photovoltaic performance. UV-vis spectroscopy and cyclic voltammetry studies showed that variations in alkyl chain length affect crystallization, light absorption, and the highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels. These factors have a pronounced impact on the morphology of BHJ thin films and their charge carrier separation and transportation characteristics, which, in turn, influences photovoltaic properties.

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Section: Resultsmentioning

confidence: 97%

Section: ■ Results and Discussionmentioning

confidence: 99%

Effects of Alkyl Chain Length on the Optoelectronic Properties and Performance of Pyrrolo-Perylene Solar Cells

Liu

Kim

et al. 2015

ACS Appl. Mater. Interfaces

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“…28,29 It was expected that the low-lying HOMO levels of these copolymers would result in high opencircuit voltages of polymeric solar cells (PSCs). 30 LUMO energy levels were calculated from the onset reduction potentials (E red onset ) (20.86 V for PTTC and 20.84 V for PTVTC) and thus PTTC and PTVTC showed LUMO energy levels of 23.56 and 23.58 eV, respectively. This suggests that the LUMO energies were about 0.4 eV above those of the PC 71 BM acceptor (24.0 eV), which generates a driving force for the energetically favorable electron transfer.…”

Section: Optical Absorption and Electrochemical Characteristicsmentioning

confidence: 99%

Two dibenzo[Def, Mno]chrysene‐based polymeric semiconductors: Surprisingly opposite device performances in field‐effect transistors and solar cells

Kim

Lee

Hong

et al. 2016

J. Polym. Sci. Part A: Polym. Chem.

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A new series of conjugated polymers containing dibenzo [def, mno]chrysene units were successfully designed and synthesized to investigate their physical properties and device performances in field-effect transistors and photovoltaic cells. Two polymers, namely poly(4,10-bithiophene-6,12-bis(2-decyltetradecyloxy)-dibezo[def, mno]chrysene) (PTTC) and poly(2,2 0 -thiophenevinylenthiophene-4,10-[6,12-bis(2-decyltetra-, exhibited similar light absorption, electrochemical characteristics, and theoretical electronic structures. However, they behaved very differently when used in thin-film transistors and solar cells. The PTTC polymer with two thiophene groups had better charge transport behavior, whereas the PTVTC polymer with two thiophene units connected by a vinyl group exhibited higher efficiency in bulk heterojunction photovoltaic cells. These results were discussed in terms of their nanostructural bulk morphologies established from transmission electron microscopy and two-dimensional grazing incidence wide angle X-ray scattering analyses. V C 2016 Wiley Periodicals, Inc. J.

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“…Conversely, quite a number of research in this area emphasized on production and processing of OSC (Chen et al, 2014a(Chen et al, , 2014b(Chen et al, , 2014c(Chen et al, , 2014dArrechea et al, 2015;Bagde et al, 2015Bagde et al, , 2016Ciro et al, 2017;Bai et al, 2014aBai et al, , 2014bKim et al, 2014Kim et al, , 2015Kim et al, , 2013Kan et al, 2014;Du et al, 2015;Lim et al, 2016;Mercier et al, 2014;Ni et al, 2014Ni et al, , 2015Yang et al, 2014Yang et al, , 2016Yang et al, , 2015aYang et al, , 2015bNarayanaswamy et al, 2016). Some focused on solution processed bulk heterojunction solar cells (Do et al, 2015;Dutta et al, 2012dDutta et al, , 2012bDutta et al, , 2012cKumar et al, 2015;Sharma et al, 2014;Liang et al, 2016;Lim et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Production and characterization of organic solar cells

Uyanga

Okwu

Adeoye

et al. 2018

WJE

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Purpose The study aims to carry out the production of a bulk heterojunction organic solar cell in a laboratory scale using a blend of poly (3-hexylthiopene) (P3HT) and [6, 6]-phenyl (C61) butyric acid methyl ether (PCBM). Design/methodology/approach Four inverted geometry organic solar cells were prepared based on 1:1 ratio of P3HT to PCBM and subjected to post annealing at different temperatures of 32, 120, 130 and 140°C. Solar cells were fabricated with structure glass/ITO/P3HT:PCBM/PEDOT:PSS/Au and characterized using Keithley 2400 series sourcemeter and a multimeter interfaced to a computer system with a LabVIEW software, which showed both dark and illumination current–voltage characteristic curves. Four reference cells were also fabricated with structure soda lime glass/P3HT:PCBM and annealed at different temperatures of 32, 120, 130 and 140°C. Findings The third organic solar cell prepared, Sample CITO, had the best performance with power conversion efficiency (PCE) of 2.0281 per cent, fill factor (FF) of 0.392, short circuit current of −0.0133 A and open circuit voltage of 0.389 V. Annealing of active layer was found to improve cell morphology, FF and PCE. Annealing of the active layer at 140°C resulted in a decrease of the PCE to 2.01 per cent. Research limitations/implications These findings are in good agreement with previous investigation in literature which reported that best annealing temperature for a 1:1 ratio blend of active material is 130°C. Ultraviolet–visible spectra on reference cells showed that sample CITO had wider absorption spectra with peak absorbance at a wavelength of 508 nm. Originality/value This research is purely original.

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A potential naphtho[2,1-b:3,4-b′]dithiophene-based polymer with large open circuit voltage for efficient use in organic solar cells

Abstract: We designed a new copolymer, PNDT-BTN with NDT and alkoxy-naphthalene units. PNDT-BDT showed an effectively lowered HOMO level by inducing non-planarity, resulting in enhanced VOC.

Cited by 14 publications

References 53 publications

Effects of Alkyl Chain Length on the Optoelectronic Properties and Performance of Pyrrolo-Perylene Solar Cells

Effects of Alkyl Chain Length on the Optoelectronic Properties and Performance of Pyrrolo-Perylene Solar Cells

Two dibenzo[Def, Mno]chrysene‐based polymeric semiconductors: Surprisingly opposite device performances in field‐effect transistors and solar cells

Production and characterization of organic solar cells

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