Enhanced solar cell performance by replacing benzodithiophene with naphthodithiophene in diketopyrrolopyrrole-based copolymers

Peng, Qiang; Huang, Qin; Hou, Xiaotong; Chang, P.C.; Xu, Jun; Deng, Shumin

doi:10.1039/c2cc36324k

Cited by 69 publications

(39 citation statements)

References 31 publications

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“…The weight ratio of the PTB7: polymer was optimized from 2:1 to 1:2 and the optimized weight ratio was 1:1. In some cases, a small amount of the high boiling‐point additive DIO was used to optimize the morphology . Figure shows the best J–V curves of the devices.…”

Section: Resultsmentioning

confidence: 96%

The Photoelectric Properties of Polymer Acceptors Containing Oxadiazole and Thiadiazole

Weng

Guo

et al. 2017

Macromol. Chem. Phys.

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By the introduction of electron‐deficient five‐membered heterocycles 1,3,4‐oxadiazole (OZ) or 1,3,4‐thiadiazole (TZ) moieties, two new A1–D–A2–D‐type polymer acceptors containing naphthalene diimide, named PNOZ and PNTZ, are prepared and applied for all‐polymer solar cells. Both polymer acceptors possess deeply lowest unoccupied molecular orbital (LUMO) energy levels below −4.0 eV and show broad absorption spectra in the range of 300–800 nm. Compared with PNOZ, PNTZ shows broader and stronger absorption, slightly higher lying LUMO level and better microphase separation size. Employing PNTZ as the acceptor material and PTB7 as the donor material, the all‐polymer solar cells based on PTB7/PTNZ (1:1, by weight) give the best power conversion efficiency of 2.58% with a short‐circuit current density (Jsc) of 10.05 mA cm−2, an open‐circuit voltage (Voc) of 0.70 V, and a fill factor (FF) of 0.37 due to the formation of a well‐optimized, bicontinuous network of the donor and acceptor polymer domains.

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Section: Resultsmentioning

confidence: 96%

The Photoelectric Properties of Polymer Acceptors Containing Oxadiazole and Thiadiazole

Weng

Guo

et al. 2017

Macromol. Chem. Phys.

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“…The peaks for the first band are located at 385 and 392 nm for PADT‐DPP and PADT‐FDPP, respectively. The second band at the long‐wavelength range, with the absorptions peaks at 775 for PADT‐DPP and 745 nm for PADT‐FDPP, should be attributed to intramolecular charge transfer (ICT) of the D–A conjugated polymers . The extent of ICT transition is an indirect parameter to assess the electron‐donating ability of a donor unit .…”

Section: Resultsmentioning

confidence: 99%

“…In addition to the tricyclic ring system, the larger π‐conjugated tetracyclic aromatics are also of great interest to researchers. For instance, Peng's group synthesized the copolymer based on naphthodithiophene (NDT), a tetracyclic donor unit, and achieved high efficiency of 6.92%.…”

Section: Introductionmentioning

confidence: 99%

Low band‐gap D–A conjugated copolymers based on anthradithiophene and diketopyrrolopyrrole for polymer solar cells and field‐effect transistors

Huang

Zhu

Zhang

et al. 2014

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

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Two conjugated copolymers PADT‐DPP and PADT‐FDPP based on anthradithiophene and diketopyrrolopyrrole, with thiophene and furan as the π‐conjugated bridge, respectively, were successfully synthesized and characterized. The number‐averaged molecular weights of the two polymers are 38.7 and 30.2 kg/mol, respectively. Polymers PADT‐DPP and PADT‐FDPP exhibit broad absorption bands and their optical band gaps are 1.44 and 1.50 eV, respectively. The highest occupied molecular orbital energy level of PADT‐DPP is located at −5.03 eV while that of PADT‐FDPP is at −5.16 eV. In field‐effect transistors, PADT‐DPP and PADT‐FDPP displayed hole mobilities of 4.7 × 10−3 and 2.7 × 10−3 cm2/(V s), respectively. In polymer solar cells, PADT‐DPP and PADT‐FDPP showed power conversion efficiency (PCE) of 3.44% and 0.29%, respectively. Atomic force microscopy revealed that the poor efficiency of PADT‐FDPP should be related to the large two‐phase separation in its active layer. If 1,8‐diiodooctane (DIO) was used as the solvent additive, the PCE of PADT‐DPP remained almost unchanged due to very limited morphology variation. However, the addition of DIO could remarkably elevate the PCE of PADT‐FDPP to 2.62% because of the greatly improved morphology. Our results suggest that the anthradithiophene as an electron‐donating polycyclic system is useful to construct new D–A alternating copolymers for efficient polymer solar cells. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014, 52, 1652–1661

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“…For PBDTT‐DFDTQX, side‐chain π‐conjugation extension reduces the hopping distance, which is more helpful for carriers to transport by hopping between the pendent conjugated units 26. 27 However, for PNDT‐DFDTQX, main‐chain π‐conjugation extension enhances the length of effective conjugation and the planarity of the main chain, leading to a highly ordered structure and π–π stacking, which mainly contributes to efficient charge transport along the main chain 28. Hence, PNDT‐DFDTQX exhibits the highest hole mobility.…”

Section: Resultsmentioning

confidence: 99%

Effect of Extended π‐Conjugation Structure of Donor–Acceptor Conjugated Copolymers on the Photoelectronic Properties

Wang

Shi

et al. 2014

Chemistry An Asian Journal

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New donor-acceptor conjugated copolymers based on alkylthienylbenzodithiophene (BDTT) and alkoxynaphthodithiophene (NDT) have been synthesized and compared with their benzo[1,2-b:4,5-b']dithiophene (BDT)-based analogues to investigate the effect of the extended π conjugation of the polymer main chain on the physicochemical properties of the polymers. A systematic investigation into the optical properties, energy levels, field-effect transistor characteristics, and photovoltaic characteristics of these polymers was conducted. Both polymers demonstrated enhanced photovoltaic performance and increased hole mobility compared with the BDT-based analogue. However, the BDTT-based polymer (with π-conjugation extension perpendicular to main chain) gave the highest power conversion efficiency of 5.07% for the single-junction polymer solar cell, whereas the NDT-based polymer (with π-conjugation extension along the main chain) achieved the highest hole mobility of approximately 0.1 cm(2) V(-1) s(-1) based on the field-effect transistor; this indicated that extending the π conjugation in different orientations would have a significant influence on the properties of the resulting polymers.

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Enhanced solar cell performance by replacing benzodithiophene with naphthodithiophene in diketopyrrolopyrrole-based copolymers

Cited by 69 publications

References 31 publications

The Photoelectric Properties of Polymer Acceptors Containing Oxadiazole and Thiadiazole

The Photoelectric Properties of Polymer Acceptors Containing Oxadiazole and Thiadiazole

Low band‐gap D–A conjugated copolymers based on anthradithiophene and diketopyrrolopyrrole for polymer solar cells and field‐effect transistors

Effect of Extended π‐Conjugation Structure of Donor–Acceptor Conjugated Copolymers on the Photoelectronic Properties

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