Photovoltaic properties of a new quinoxaline-based copolymer with Thieno[3,2-b]thiophene side chain for organic photovoltaic cell applications

Kim, Mi-Jeong; Kim, Jihoon; Ahn, Jong Jun; Hwang, Do‐Hoon

doi:10.1016/j.dyepig.2016.06.011

Cited by 15 publications

(5 citation statements)

References 31 publications

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“…The results are depicted in Figure c and Figure S8. According to the equation J SC = 9με r ε 0 V 2 / 8d 3 , the μ h /μ e mobilities of the J52ClF :IT-4F blend films were estimated to be 3.73 × 10 –4 / 2.54 × 10 –4 cm 2 V –1 s –1 for the as-cast films with a μ h /μ e of 1.47 and 4.21 × 10 –4 /3.89 × 10 –4 cm 2 V –1 s –1 for the annealed films with a μ h /μ e of 1.08. Apparently, charge carrier mobilities appeared to increase and be more balanced via TA treatment, which may be due to the percolation networks possessing a more comparable donor/acceptor domain size.…”

Section: Resultsmentioning

confidence: 99%

Simple Approach for Synthesizing a Fluorinated Polymer Donor Enables Promoted Efficiency in Polymer Solar Cells

Liao

Weng

Zeng

et al. 2022

ACS Appl. Energy Mater.

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In this contribution, we used a practical method to synthesize 3-fluorothiophene as π-bridge units on the polymer backbone via constructing 3-fluoro-2-iodothiophene to decrease synthesis steps and lower costs. Fluorine atoms introduced into the polymer backbone can improve polymer planarity, packing, crystallinity, and hole mobility via extensive noncovalent interactions such as F−H, F−Cl, F−S, and F−π. When compared to the analogue PBZ-Cl without any fluorine substituent on the thiophene unit, our fluorinated polymer J52ClF exhibited red-shifted absorption of roughly 42 nm with a narrower band gap (E g opt ) of 1.82 eV, a low-lying highest occupied molecular orbital (HOMO) energy level, and a highly coplanar molecular configuration in the backbone. The optimal device based on J52ClF:IT-4F achieved a desired power conversion efficiency (PCE) of 14.59%, a V OC of 0.93 V, a J SC of 22.67 mA cm −2 , a fill factor (FF) of 69.22%, and an E loss of 0.57 V, all of which were significantly superior to those of PBZ-Cl:IT-4F (PCE = 9.7%). It demonstrated that fluorinating π-conjugated bridges utilizing 3-fluoro-2-iodothiophene is a practical strategy that deserves greater attention for increasing photovoltaic performance.

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Section: Resultsmentioning

confidence: 99%

Simple Approach for Synthesizing a Fluorinated Polymer Donor Enables Promoted Efficiency in Polymer Solar Cells

Liao

Weng

Zeng

et al. 2022

ACS Appl. Energy Mater.

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“…Based on the main chain BDT-T-Qx-T, Qin and co-workers synthesized a series of novel polymer donors PBDT-TQ (2013) , PBDT-TTQ (2013) , PBDT-PTQ (2013) and PBDT-PTTQ (2013) , which were designed by introducing the functional side chain alkyloxy into the BDT as well as thiophene-based and benzene-based side chains into the Qx unit, in that turn. [198] Similarly,P(BDT-DTQx) (2013) was prepared by Fu et al; [92] PBDT-TDTQx (2016) andPBDT-TTDTQx (2016) were reported by Kim et al; [199] POF1 (2016) and POF2 (2016) were designed by Singh et al; [200] P3 (2022) was also prepared by Aslan and co-workers, respectively. [201] Notably, after blending with the acceptor PC 71 BM, PBDT-TDQx and PBDT-TTDTQx with the substitution of solubilized alkyl chain 2-butyloctyl effectively improve the miscibility of donor in the active layer.…”

Section: As For the Main-chain Engineering Bdt-t-bsdz-t Bdt-t-btz-t A...mentioning

confidence: 97%

Research progress and application of high efficiency organic solar cells based on benzodithiophene donor materials

Lin,

Peng,

Shi

et al. 2023

Preprint

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In recent decades, the demand for clean and renewable energy has grown increasingly urgent due to the irreversible alteration of the global climate. As a result, efficient organic solar cells (OSCs) have gradually gained attention as a study hotspot. To break up this dilemma, this paper reviews the molecular design strategies of benzodithiophen (BDT)-based polymer and small molecule donor materials since their birth, focusing on the development of main-chain engineering, side-chain engineering and other unique molecular design paths. Up to now, the state-of-the-art power conversion efficiency (PCE) of binary OSCs prepared by BDT-based donor materials has approached 20%. Our work detailly discusses the potential relationship between the molecular changes of donor materials and photoelectric performance in corresponding OSC devices, thereby presenting a rational molecular design guidance for stable and efficient donor materials in future.

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“…The fused heterocyclic ring of thieno[3,2- b ]thiophene (TT) is attractive as an electron-donating building block or π-bridge in D–π–A type conjugated polymers, because of its excellent electron-donating ability and good planarity [ 21 , 22 , 23 , 24 , 25 ]. In particular, polymer donors containing TT exhibited a well-organized crystal domain and high charge carrier mobility and can be used in the development of efficient OPVs.…”

Section: Introductionmentioning

confidence: 99%

Novel Conjugated Polymers Containing 3-(2-Octyldodecyl)thieno[3,2-b]thiophene as a π-Bridge for Organic Photovoltaic Applications

Park

et al. 2020

Polymers

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3-(2-Octyldodecyl)thieno[3,2-b]thiophen was successfully synthesized as a new π-bridge with a long branched side alkyl chain. Two donor-π-bridge-acceptor type copolymers were designed and synthesized by combining this π-bridge structure, a fluorinated benzothiadiazole acceptor unit, and a thiophene or thienothiophene donor unit, (PT-ODTTBT or PTT-ODTTBT respectively) through Stille polymerization. Inverted OPV devices with a structure of ITO/ZnO/polymer:PC71BM/MoO3/Ag were fabricated by spin-coating in ambient atmosphere or N2 within a glovebox to evaluate the photovoltaic performance of the synthesized polymers (effective active area: 0.09 cm2). The PTT-ODTTBT:PC71BM-based structure exhibited the highest organic photovoltaic (OPV) device performance, with a maximum power conversion efficiency (PCE) of 7.05 (6.88 ± 0.12)%, a high short-circuit current (Jsc) of 13.96 mA/cm2, and a fill factor (FF) of 66.94 (66.47 ± 0.63)%; whereas the PT-ODTTBT:PC71BM-based device achieved overall lower device performance. According to GIWAXS analysis, both neat and blend films of PTT-ODTTBT exhibited well-organized lamellar stacking, leading to a higher charge carrier mobility than that of PT-ODTTBT. Compared to PT-ODTTBT containing a thiophene donor unit, PTT-ODTTBT containing a thienothiophene donor unit exhibited higher crystallinity, preferential face-on orientation, and a bicontinuous interpenetrating network in the film, which are responsible for the improved OPV performance in terms of high Jsc, FF, and PCE.

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Photovoltaic properties of a new quinoxaline-based copolymer with Thieno[3,2-b]thiophene side chain for organic photovoltaic cell applications

Cited by 15 publications

References 31 publications

Simple Approach for Synthesizing a Fluorinated Polymer Donor Enables Promoted Efficiency in Polymer Solar Cells

Simple Approach for Synthesizing a Fluorinated Polymer Donor Enables Promoted Efficiency in Polymer Solar Cells

Research progress and application of high efficiency organic solar cells based on benzodithiophene donor materials

Novel Conjugated Polymers Containing 3-(2-Octyldodecyl)thieno[3,2-b]thiophene as a π-Bridge for Organic Photovoltaic Applications

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