Synergism of molecular weight, crystallization and morphology of poly(3-butylthiophene) for photovoltaic applications

Li, Sijun; Wang, Sisi; Zhang, Baohua; Ye, Feng; Tang, Haowei; Chen, Zhaobin; Yang, Xiaoniu

doi:10.1016/j.orgel.2013.11.036

Cited by 8 publications

(6 citation statements)

References 93 publications

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“…Such a trend is consistent with the previous report that the crystallinity of poly(3-butylthiophene) increased with molecular weight and then decreased with a further increase of molecular weight. 32 We note that it was reported that P3HT with the molecular weight below 10 kDa crystallized with the fully extended chains, while crystallized with the folded chains at the higher molecular weights. 33,34 P3HS is expected to exhibit a similar trend during crystallization with a higher turning point of molecular weight due to their similar molecular structure and more rigid polyselenophene backbone.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Tailoring Phase Transition in Poly(3-hexylselenophene) Thin Films and Correlating Their Crystalline Polymorphs with Charge Transport Properties for Organic Field-Effect Transistors

et al. 2017

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Poly(3-hexylselenophene) (P3HS) carries attractive advantages over their close analogue poly(3-hexylthiophene) (P3HT), including a stronger intermolecular interaction, a better interchain charge hopping, and a narrower bandgap. However, P3HS is much less studied compared to P3HT. Herein, we report on intriguing reversible phase transition between two different crystalline polymorphs (i.e., form I and II) in P3HS thin films with different molecular weights enabled by alternating thermal and solvent vapor annealing. More importantly, the phase transition kinetics and mechanism as well as the associated changes on molecular packing structures were also scrutinized. The correlation between different P3HS crystalline polymorphs and the resulting field-effect mobilities was explored for the f irst time. Our study provides an insight into P3HS crystallization and phase transition, thus entailing the use of polyselenophene-based materials for a wide range of optoelectronic applications.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Tailoring Phase Transition in Poly(3-hexylselenophene) Thin Films and Correlating Their Crystalline Polymorphs with Charge Transport Properties for Organic Field-Effect Transistors

et al. 2017

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“…The MePBDFCl H with a middle molecular‐weight has slightly improved charge mobility than PBDFCl with high molecular‐weight, which signifies the middle molecular‐weight has been enough to generate continuous ordered domains, serving as pathways and therefore benefit efficient charge transportation. [ 54 , 55 , 56 ] On the other hand, Previous research has demonstrated that polydispersity of polymer is important for achieving high carrier mobilities. Even doping of small amounts of low molecular weight material can also limit interchain hopping, reducing the charge carrier mobility.…”

Section: Resultsmentioning

confidence: 99%

Conjugated Mesopolymer Achieving 15% Efficiency Single‐Junction Organic Solar Cells

Zheng

et al. 2022

Advanced Science

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The high‐performance organic solar cells (OSCs) tend to choose the polymers with high molecular weight as donors, which easily produce good crystallinity to facilitate intermolecular charge transfer. However, these polymers usually accompanied by the low solubility and synthetic difficulty, increasing batch‐to‐batch variations. The proposal of conjugated mesopolymers (molar mass (Mn) in 1–10 kDa) can overcome these problems. Herein, a new mesopolymer, MePBDFClH as donor material is designed and synthesized, and firstly applied in OSCs. As a comparison, other lower molecular weight mesopolymer of MePBDFClL and higher molecular weight polymer of PBDFCl with same structure are also prepared and investigated. Because of its appropriate phase separation and miscibility in the blend film, the MePBDFClH exhibits the highest power conversion efficiency (PCE) of 15.06% among the three materials. Meanwhile, the champion PCE is a new record for benzo[1,2‐b:4,5‐b′]difuran‐based photovoltaic materials. Importantly, comparing to the pronounced PCE decrease of polymer PBDFCl by about 12%, a slightly PCE difference for mespolymer MePBDFClL is only less than 5%, reducing the batch‐to‐batch variation. This work not only suggests that the benzo[1,2‐b:4,5‐b′]difuran unit is a promising electron‐donating core but also shows that the mesopolymers have great potentials to produce the low‐differentiated and high‐performance organic photovoltaic materials.

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“…The PCE value of approximately 5% was significantly higher than those of poly(3-butylthiophene) (P3BT) and poly(3-octylthiophene) (P3OT) [ 9 ]. This was attributed to the higher charge carrier extraction capability of the P3HT active layer which is blended with a proper fullerene derivative, owing to its preferable molecular morphology after undergoing the annealing process [ 10 , 11 ]. P3BT might be a suitable material for organic photovoltaic (OPV) applications owing to its higher crystallization facility [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Block Ratio on Thermal, Optical, and Photovoltaic Properties of Poly(3-hexylthiophene)-b-poly(3-butylthiophene)-b-poly(3-octylthiophene)

Nguyen

Song

et al. 2022

Molecules

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Efforts to improve the solar power conversion efficiencies of binary bulk heterojunction-type organic photovoltaic devices using an active layer consisting of a poly-(3-alkylthiophene) (P3AT) homopolymer and a suitable fullerene derivative face barriers caused by the intrinsic properties of homopolymers. To overcome such barriers, researchers might be able to chemically tailor homopolymers by means of monomer ratio-balanced block copolymerization to obtain preferable properties. Triblock copolymers consisting of three components—3-hexylthiophene (HT), 3-butylthiophene (BT), and 3-octylthiophene (OT)—were synthesized via Grignard metathesis (GRIM) polymerization. The component ratios of the synthesized block copolymers were virtually the same as the feeding ratios of the monomers, a fact which was verified using 1H-NMR spectra. All the copolymers exhibited comparable crystalline and melting temperatures, which increased when one type of monomer became dominant. In addition, their power conversion efficiencies and photoluminescence properties were governed by the major components of the copolymers. Interestingly, the HT component-dominated block copolymer indicated the highest power conversion efficiency, comparable to that of its homopolymer, although its molecular weight was significantly shorter.

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Synergism of molecular weight, crystallization and morphology of poly(3-butylthiophene) for photovoltaic applications

Cited by 8 publications

References 93 publications

Tailoring Phase Transition in Poly(3-hexylselenophene) Thin Films and Correlating Their Crystalline Polymorphs with Charge Transport Properties for Organic Field-Effect Transistors

Tailoring Phase Transition in Poly(3-hexylselenophene) Thin Films and Correlating Their Crystalline Polymorphs with Charge Transport Properties for Organic Field-Effect Transistors

Conjugated Mesopolymer Achieving 15% Efficiency Single‐Junction Organic Solar Cells

Influence of Block Ratio on Thermal, Optical, and Photovoltaic Properties of Poly(3-hexylthiophene)-b-poly(3-butylthiophene)-b-poly(3-octylthiophene)

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