Significant improvement of photovoltaic performance by embedding thiophene in solution-processed star-shaped TPA-DPP backbone

Tang, Ailing; Li, Liangjie; Lu, Zhenhuan; Huang, Jianhua; Jia, Hui; Chen, Zhan; Tan, Zhanao; Li, Yongfang; Yao, Jiannian

doi:10.1039/c3ta10640c

Cited by 69 publications

(60 citation statements)

References 55 publications

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“…Two typical broad diffraction peaks are observed in all these thin films. The first [43,44]. The shortest inter-chain spacing and stacking distance are found in the PBDTT-BTQ thin film, which is consistent with its highest hole mobility.…”

Section: Hole Mobilitysupporting

confidence: 67%

Manipulating backbone structure with various conjugated spacers to enhance photovoltaic performance of D–A-type two-dimensional copolymers

Dang

Xiao

Zhou

et al. 2014

Organic Electronics

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a b s t r a c tA class of low band-gap two-dimensional conjugated polymers of PBDTT-FQ, PBDTT-TQ, PBDTT-BTQ and PBDTT-TTQ was designed and synthesized, which contains the same di(alkylthiophene)-substituted benzo [1,2-b:4,5-b 0 ]dithiophene (BDTT) and 6,7-difluoroquinoxaline (Q) units, as well as various conjugated spacers of furan, thiophene, bithiophene and thieno [3,2-b]thiophene in the main chain. Significant effect of the varied spacers between the BDTT and Q units on the thermal, optical, electrochemical and photovoltaic properties was investigated and observed for these two-dimensional copolymers in the polymer solar cells. The maximum power conversion efficiency of 5.9% with a short circuit current of 13.7 mA/cm 2 and a fill factor of 0.56 was obtained for the PBDTT-TQ with thiophene spacer in the bulk hetero-junction PSCs using [6,6]-phenyl-C 71 -butyric acid methyl ester as acceptor.

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Section: Hole Mobilitysupporting

confidence: 67%

Manipulating backbone structure with various conjugated spacers to enhance photovoltaic performance of D–A-type two-dimensional copolymers

Dang

Xiao

Zhou

et al. 2014

Organic Electronics

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“…Obviously, the increase in oxidation potentials of these copolymers can be attributed to the larger number of BTI units incorporated into the polymer main chains, implying that they varied with respect to the ICT strengths resulting from the content of the electron-pulling unit. [17][18][19] The reduction potential onsets of the polymers PBTIBDT-3, PBTIBDT-5, and PBTIBDT-7 are −0.90, −0.83, and −0.87 eV, respectively, which correspond to LUMO energy levels of −3.90, −3.97, and −3.94 eV, respectively. The electrochemical bandgaps calculated from cyclic voltammetry data are~1.78, 1.62, and 1.64 eV, which are somewhat lower than the optical bandgaps estimated from the onset wavelengths of the absorption spectra.…”

Section: Synthesis Of Poly(2-octyldodecyl-3-(2-thienyl)-4h-dithieno [mentioning

confidence: 99%

“…13,14 In this paper, we report push-pull type conjugated copolymers PBTIBDTs for PSC devices utilizing BTI as the electron-pulling unit and BDT as the electron-pushing unit (Scheme 1). [15][16][17] These push-pull type conjugated polymers were synthesized by the Stille coupling reaction of 2,6-dibromo-4,8-dioctyloxybenzo [1,2-b;3,4-b']…”

Section: Introductionmentioning

confidence: 99%

Syntheses and Properties of Copolymers with N‐Alkyl‐2,2′‐bithiophene‐3,3′‐dicarboximide Unit for Polymer Solar Cells

Kim

et al. 2015

Bulletin Korean Chem Soc

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We report new random copolymers using the electron-deficient unit N-alkyl-2,2 0 -bithiophene-3,3 0 -dicarboximide (BTI) for organic solar cells. For absorption over a broader range of the solar spectrum, push-pull types of conjugated polymers PBTIBDT-3, PBTIBDT-5, and PBTIBDT-7, containing 4,8-bis(2-octyldodecyloxy) benzo[1,2-b;3,4-b']dithiophene (BDT) as electron-pushing unit and BTI as electron-pulling unit, were synthesized. The polymers were synthesized by coupling electron-pushing and electron-pulling units by Stille polymerization with Pd(0) catalyst. The incorporation of more BTI units induced more red shift of the absorption spectra of the polymer thin films. The device comprising PBTIBDT-5 and PC 71 BM (1:1) showed V OC = 0.76 V, J SC = 3.28 mA/cm 2 , and fill factor (FF) = 0.51, giving a power conversion efficiency of 1.26%.

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“…[1][2][3][4] Even though, researches of organic solar cells (OSCs) based on conjugated polymers have brought improved PCE up to 7-10%, small molecules have been investigated extensively caused by the advantages of well defined molecular structure, definite molecular weight and high purity of the material for the credible reproducibility of the device performance. 5 In the desperate endeavor to highlight the bright points of the small molecules, various kinds of combination of the electron rich/deficient units, triphenylamine, 6 oligothiophene, 7 diketopyrrolopyrrole, 8,9 2,1,3-benzothiadiazole, 10,11 1,2,5-thiadiazolo [3,4-c]pyridine 12 and dithienosilole 13 have been reported. 3 To improve the low solubility of the well established 2,1,3-benzothiadiazole (BT) unit, 2,2-dimethyl-2H-benzimidazole (MBI), electron deficient units, has been designed and utilized for the intramolecular charge transfer (ICT) in our previous study ( Figure 1).…”

Section: Introductionmentioning

confidence: 99%

2,2-dimethyl-2H-benzimidazole based small molecules for organic solar cells

et al. 2015

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We report the small molecules utilizing new electron-deficient unit, 2,2-dimethyl-2H-benzimidazole (MBI) and phenanthro[9,10-c][1,2,5]thiadiazole (PT), for the photovoltaic application. Donor-acceptor-donor (D-A-D) types of conjugated small molecules containing benzo[1,2-b;3,4-b']dithiophene (BDT) as electron rich unit and MBI and PT as electron deficient units (SM1 and SM2) were synthesized. D-A-D type of small molecules has the abilities of increasing intramolecular charge transfer (ICT) inducing long wavelength absorption and lowering the HOMO level for the improvement of open-circuit voltage (V OC ). SM1 was synthesized by coupling BDT and PT units by Stille coupling reaction with Pd(0)-catalyst. By using same type of Pd(0)-catalized reaction, BDT unit and MBI unit linked with two thiophenes were coupled to provide SM2. The spectrum of SM2 in the solid thin film shows absorption band with maximum peak at 601 nm and the absorption onset at 756 nm, corresponding to band gap of 1.64 eV. The device comprising SM2 with PCBM (3:7) showed a V OC of 0.62 V, a J SC of 1.69 mA/cm 2 , and a fill factor (FF) of 0.27, giving a power conversion efficiency of 0.28%.

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Significant improvement of photovoltaic performance by embedding thiophene in solution-processed star-shaped TPA-DPP backbone

Cited by 69 publications

References 55 publications

Manipulating backbone structure with various conjugated spacers to enhance photovoltaic performance of D–A-type two-dimensional copolymers

Manipulating backbone structure with various conjugated spacers to enhance photovoltaic performance of D–A-type two-dimensional copolymers

Syntheses and Properties of Copolymers with N‐Alkyl‐2,2′‐bithiophene‐3,3′‐dicarboximide Unit for Polymer Solar Cells

2,2-dimethyl-2H-benzimidazole based small molecules for organic solar cells

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