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Keshtov ML, Kuklin SA, Khokhlov AR, Xie Z, Alekseev VG, Dahiya H, Singhal R, Sharma GD. New medium bandgap donor D-A 1 -D-A 2 type Copolymers Based on Anthra[1,2-b: 4,3-b":6,7-c"'] Trithiophene-8,12-dione Groups for High -Efficient non -fullerene Polymer Solar Cells. Macromol Rapid Commun 2022; 43:e2100839. [PMID: 35040533 DOI: 10.1002/marc.202100839] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 12/20/2021] [Indexed: 11/09/2022]
Abstract
We synthesized a new acceptor unit anthra[1,2-b: 4,3-b': 6,7-c'']trithiophene-8,12-dione (А3Т) (A2) and then used it to design D-A1 -D-A2 medium bandgap donor copolymers with same thiophene (D) and A2 units but different A1 i.e., fluorinated benzothiadiazole (F-BTz) and benzothiadiazole (BTz) denoted as P130 and P131, respectively. Their detailed optical and electrochemical properties were examined. The copolymers show good solubility in common organic solvents, broad absorption in the visible spectral region from 300 nm to 700 nm, and deeper HOMO levels of -5.45 and -5.34 eV for P130 and P131, respectively. Finally, an optimized polymer solar cell based on P131 as the donor and narrow bandgap non-fullerene small molecule acceptor Y6 demonstrated a PCE of more than 11.13%. To further improve the efficiency of the non-fullerene PSC, we optimized the P130 by introducing a fluorine atom into the BTz unit, F-BTz acceptor unit, PCE PSC based on P130: Y6 active layer increased to more than 15.28 %, which is higher than that for non-fluorinated analog P131:Y6. The increase in the PCE for former PSC is attributed to the more crystalline nature and compact π-π stacking distance, leading to more balanced charge transport and reduced charge recombination. These remarkable results demonstrate that A3T-based copolymer P130 with F-BTz as the second acceptor is a promising donor material for high-performance PSCs. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- M L Keshtov
- A.N. Nesmeyanov Institute of Organoelement compounds of the Russian Academy of Sciences, Vavilova St., 28, Moscow, 119991, Russian Federation
| | - S A Kuklin
- A.N. Nesmeyanov Institute of Organoelement compounds of the Russian Academy of Sciences, Vavilova St., 28, Moscow, 119991, Russian Federation
| | - A R Khokhlov
- A.N. Nesmeyanov Institute of Organoelement compounds of the Russian Academy of Sciences, Vavilova St., 28, Moscow, 119991, Russian Federation
| | - Zh Xie
- Changchun Institute of Applied Chemistry of Chinese Academy of Sciences, State Key Laboratory of Polymer Physics and Chemistry, Changchun, China
| | - V G Alekseev
- Analyticalchemistrydepartment, TverStateUniversity, Sadovyiper. 35, Tver, 170002, Russia
| | - Hemraj Dahiya
- Department of Physics, The LNM Institute for Information Technology, Jamdoli, 302031, India
| | - Rahul Singhal
- Department of Physics, Malviya National Institute of Technology, JLN Marg, 302017, India
| | - Ganesh D Sharma
- Department of Physics, The LNM Institute for Information Technology, Jamdoli, 302031, India.,Deptartment of Electronics and Communication Engineering, The LNM Institute for Information Technology, Jamdoli, 302031, India
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An L, Huang Y, Wang X, Liang Z, Li J, Tong J. Fluorination Effect for Highly Conjugated Alternating Copolymers Involving Thienylenevinylene-Thiophene-Flanked Benzodithiophene and Benzothiadiazole Subunits in Photovoltaic Application. Polymers (Basel) 2020; 12:E504. [PMID: 32106540 PMCID: PMC7254375 DOI: 10.3390/polym12030504] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 02/21/2020] [Accepted: 02/22/2020] [Indexed: 01/28/2023] Open
Abstract
Two two-dimensional (2D) donor-acceptor (D-A) type conjugated polymers (CPs), namely, PBDT-TVT-BT and PBDT-TVT-FBT, in which two ((E)-(4,5-didecylthien-2-yl)vinyl)- 5-thien-2-yl (TVT) side chains were introduced into 4,8-position of benzo[1,2-b:4,5-b']dithiophene (BDT) to synthesize the highly conjugated electron-donating building block BDT-TVT, and benzothiadiazole (BT) and/or 5,6-difluoro-BT as electron-accepting unit, were designed to systematically ascertain the impact of fluorination on thermal stability, optoelectronic property, and photovoltaic performance. Both resultant copolymers exhibited the lower bandgap (1.60 ~ 1.69 eV) and deeper highest occupied molecular orbital energy level (EHOMO, -5.17 ~ -5.37 eV). It was found that the narrowed absorption, deepened EHOMO and weakened aggregation in solid film but had insignificant influence on thermal stability after fluorination in PBDT-TVT-FBT. Accordingly, a PBDT-TVT-FBT-based device yielded 16% increased power conversion efficiency (PCE) from 4.50% to 5.22%, benefited from synergistically elevated VOC, JSC, and FF, which was mainly originated from deepened EHOMO, increased μh, μe, and more balanced μh/μe ratio, higher exciton dissociation probability and improved microstructural morphology of the photoactive layer as a result of incorporating fluorine into the polymer backbone.
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Affiliation(s)
- Lili An
- Key Laboratory for Utility of Environment- Friendly Composite Materials and Biomass in University of Gansu Province, School of Chemical Engineering, Northwest Minzu University, Lanzhou 730030, China
| | - Yubo Huang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
| | - Xu Wang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
| | - Zezhou Liang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
- CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Jianfeng Li
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
| | - Junfeng Tong
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; (Y.H.); (X.W.); (Z.L.); (J.L.); (J.T.)
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Elevated Photovoltaic Performance in Medium Bandgap Copolymers Composed of Indacenodi-thieno[3,2- b]thiophene and Benzothiadiazole Subunits by Modulating the π-Bridge. Polymers (Basel) 2020; 12:polym12020368. [PMID: 32046028 PMCID: PMC7077401 DOI: 10.3390/polym12020368] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Revised: 01/10/2020] [Accepted: 01/13/2020] [Indexed: 11/28/2022] Open
Abstract
Two random conjugated polymers (CPs), namely, PIDTT-TBT and PIDTT-TFBT, in which indacenodithieno[3,2-b]thiophene (IDTT), 3-octylthiophene, and benzothiadiazole (BT) were in turn utilized as electron-donor (D), π-bridge, and electron-acceptor (A) units, were synthesized to comprehensively analyze the impact of reducing thiophene π-bridge and further fluorination on photostability and photovoltaic performance. Meanwhile, the control polymer PIDTT-DTBT with alternating structure was also prepared for comparison. The broadened and enhanced absorption, down-shifted highest occupied molecular orbital energy level (EHOMO), more planar molecular geometry thus enhanced the aggregation in the film state, but insignificant impact on aggregation in solution and photostability were found after both reducing thiophene π-bridge in PIDTT-TBT and further fluorination in PIDTT-TFBT. Consequently, PIDTT-TBT-based device showed 185% increased PCE of 5.84% profited by synergistically elevated VOC, JSC, and FF than those of its counterpart PIDTT-DTBT, and this improvement was chiefly ascribed to the improved absorption, deepened EHOMO, raised μh and more balanced μh/μe, and optimized morphology of photoactive layer. However, the dropped PCE was observed after further fluorination in PIDTT-TFBT, which was mainly restricted by undesired morphology for photoactive layer as a result of strong aggregation even if in the condition of the upshifted VOC. Our preliminary results can demonstrate that modulating the π-bridge in polymer backbone was an effective method with the aim to enhance the performance for solar cell.
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Nitti A, Bianchi G, Po R, Porta A, Galbiati A, Pasini D. Weiss‐Cook Condensations for the Synthesis of Bridged Bithiophene Monomers and Polymers. ChemistrySelect 2019. [DOI: 10.1002/slct.201904180] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Andrea Nitti
- Department of Chemistry and INSTM Research UnitUniversity of Pavia Via Taramelli 12 27100 Pavia Italy
| | - Gabriele Bianchi
- Research Center for Renewable Energies and EnvironmentIstituto Donegani, Eni Spa Via Fauser 4 28100 Novara Italy
| | - Riccardo Po
- Research Center for Renewable Energies and EnvironmentIstituto Donegani, Eni Spa Via Fauser 4 28100 Novara Italy
| | - Alessio Porta
- Department of Chemistry and INSTM Research UnitUniversity of Pavia Via Taramelli 12 27100 Pavia Italy
| | - Alessandro Galbiati
- New Polyurethane Technologies s.r.l. Via Stazione 12 27030 Villanova D'ardenghi, Pavia Italy
| | - Dario Pasini
- Department of Chemistry and INSTM Research UnitUniversity of Pavia Via Taramelli 12 27100 Pavia Italy
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