Recent progress in the design of narrow bandgap conjugated polymers for high-efficiency organic solar cells

Bian, Linyi; Zhu, Enwei; Tang, Jian; Zhang, Fujun

doi:10.1016/j.progpolymsci.2012.03.001

Cited by 256 publications

(208 citation statements)

References 169 publications

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“…6(b) and (d) show that the morphologies of both the PPhDOTV:PC 70 BM and PPhDOTFV:PC 70 BM layers are very similar with root-mean-square 24,25 Thus, the high LUMO energy of PPhDOTV ensured a downhill driving force for charge separation to PC 70 BM. On the other hand, because the V oc value of BHJ OPVs is determined mainly by the energy difference between the HOMO level of the donor and the LUMO level of the acceptor, 14,15 the V oc values of the PC 70 BM-based BHJ OPVs using PPhDOTV (HOMO of ¹5.14 eV) were lower than those of the BHJ OPVs using PPhDOTFV (HOMO of ¹5.34 eV).…”

Section: ¹2mentioning

confidence: 94%

“…Hence, the fluorinated PhDOT-based polymer might be a good electron-donating polymer for bulk heterojunction (BHJ) OPVs because the HOMO level of the polymer should be low in order to obtain a high open-circuit voltage (V oc ). 14,15 In this study, we developed highly soluble PhDOT-based polymers, poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s (PPhDOTV and PPhDOTFV, Fig. 1), with a more red-shifted onset of absorption by introducing a vinylene unit between PhDOTs to reduce the amount of steric hindrance between them.…”

Section: Introductionmentioning

confidence: 99%

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Organic Photovoltaics Based on Poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s

2017

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Poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s with a fluorine substituent at the phenylene moiety (PPhDOTFV) and without the substituent (PPhDOTV) were synthesized by Stille coupling polymerization. They exhibited good solubility in common organic solvents owing to a branched alkyl chain at the phenylene moiety and a narrow optical bandgap of 1.66 eV due to an increased conjugated length caused by the vinylene bridge. Both the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energy levels of PPhDOTFV were 0.2 eV deeper than those of PPhDOTV. Organic photovoltaic cells (OPVs) using PPhDOTV:PC 70 BM exhibited a short-circuit current density (J sc ) of 3.30 mA cm , an open-circuit voltage (V oc ) of 0.52 V, and a power conversion efficiency of 0.91%, as compared to 1.62 mA cm −2 , 0.68 V, and 0.45%, respectively, for OPVs using PPhDOTFV:PC 70 BM. The J sc value of PPhDOTV-based OPVs was higher than that of PPhDOTFV-based OPVs because of a large LUMO energy offset between PPhDOTV and PC 70 BM. On the other hand, the V oc value of PPhDOTV-based OPVs was lower than that of PPhDOTFV-based OPVs because of a small energy difference between the HOMO level of PPhDOTV and the LUMO level of PC 70 BM.

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Section: ¹2mentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Organic Photovoltaics Based on Poly(3,4-phenylenedioxy-2,5-thienylenevinylene)s

2017

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“…1 3 Conjugated polymers containing carbon and heteroatom frameworks with alternate donoracceptor (D-A) architecture along the polymer chain are of great importance for directing material properties towards the desired optoelectronic applications. 4 In D-A conjugated systems, interaction between a strong electron donor (D) and strong electron acceptor (A) units gives rise to a low band gap energy. 5 In addition, energy levels of the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) in these systems could be adjusted as desired by judicious selection of donor and acceptor units.…”

Section: Introductionmentioning

confidence: 99%

D-A conjugated polymers containing substituted thiophene, 1,3,4-oxadiazole and non-conjugation linkers: Synthesis and study of optical and electrochemical properties

Udayakumar

et al. 2016

J Chem Sci

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Abstract. In this communication, we report synthesis and characterization of new D-A conjugated polymers (P1-P3) consisting of electron-donating (D) 3,4-didodecyloxythiophene, electron-accepting (A) 1,3,4-oxadiazole unit and non-conjugation linkers. The conjugated segment in P1-P3 contains only five aromatic rings resulting in short conjugation length, but has an alternate D-A arrangement which significantly enhances the intramolecular charge transfer (ICT) interaction within the segment. As a result, these polymers exhibited low optical band gap in the range 2.51-2.76 eV. Fluorescence emission studies revealed that the polymer thin films emit intense blue light with emission maxima in the wavelength rage 430-480 nm. All three polymers undergo both oxidation and reduction processes under electrochemical conditions. Further, these polymers (P1-P3) exhibit low-lying HOMO and LUMO levels as a result of D-A structure of the conjugated segment. Polymer light-emitting devices were fabricated using these polymers as emissive layer with a device configuration of ITO/MoO 3 /polymer/LiF/Al. The test device based on P2 emitted blue light with a low threshold voltage of 5 V. Z-scan studies reveal that the polymers exhibit a strong optical limiting behavior. The value of the nonlinear absorption coefficient (β) of polymers is of the order 10 −11 m/W which indicates that these materials may be accomplished for fabricating optical limiters.

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“…Finally we will end up our discussion with a summary and perspective on the future research. There have been many excellent summary works dealing with various aspects of OPV technology, such as the working mechanism and physics of the OPV device [6][7][8][9], design principles and synthesis of new light absorbing materials [9][10][11][12][13][14][15][16][17][18][19], thin film morphology control and characterization [20][21], new device architecture development [22][23][24], interface engineering [25], quantum chemical calculations [26], economical aspects [27][28][29] and many insightful overviews and perspectives [30][31][32][33][34][35][36][37][38][39][40][41][42]. There are also a series of Photovoltaics Literature Survey papers by Santosh Shrestha [43] in Progress in Photovoltaics: Research and Applications which are useful for readers to catch up current research progress in various aspects regarding PV technology.…”

Section: Introductionmentioning

confidence: 99%