Polythiophenes for organic solar cells with efficiency surpassing 17%

Yuan, Xiyue; Zhao, Yunli; Xie, Dongsheng; Pan, Langheng; Liu, Xinyuan; Duan, Chunhui; Huang, Fei; Cao, Yong

doi:10.1016/j.joule.2022.02.006

Cited by 146 publications

(105 citation statements)

References 55 publications

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“…Liang et al, for example, optimized the crystallinity and vertical phase separation of P3HT:O-IDTBR by separating the crystallization process with a high boiling point solvent (1,2,4triclorobenzene) [101] . Recently, Liang and colleagues [102] demonstrated a novel method to simultaneously extend the coherence lengths of both P3HT and O-IDTBR by mixing P3HT with different molecular weights. The low molecular weight P3HT relieved the entanglement of polymer chains, leading to a more ordered structure [Figure 6C].…”

Section: Pt:non-fullerene-based Ternary Oscsmentioning

confidence: 99%

Ternary organic solar cells featuring polythiophene

Qi¹,

Ke²,

Ye³

2022

Energy Mater

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Benefiting from the creation of new photovoltaic materials and innovations in device architectures, organic photovoltaic (OPV) cells are booming. Nonetheless, their prosperity is also accompanied by challenges, such as tedious synthetic routes, increasing costs and insufficient operational stability under practical stresses. Polythiophene, with a simple chemical structure, high scalability and excellent charge transport ability, is expected to be the most promising candidate among all kinds of polymer donors. Ternary mixing, as a simple and effective method for improving the efficiency and stability of OPVs, has attracted significant attention in recent decades. This review provides an overview of the recent advances in ternary OPVs based on polythiophene and discusses the role of various third components in three types of OPV active layers, where polythiophene serves as either the host material or additive, and also clarifies how the third component plays a role in determining morphology and device performance, and finally proposes future research directions for ternary OPVs featuring polythiophene. In short, this review provides insights into polythiophene-based multicomponent systems and helps readers better understand the relationships between morphology, efficiency and stability.

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Section: Pt:non-fullerene-based Ternary Oscsmentioning

confidence: 99%

Ternary organic solar cells featuring polythiophene

Qi¹,

Ke²,

Ye³

2022

Energy Mater

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“…[ 24–26 ] For OSCs, polythiophenes have exhibited great competitiveness over high‐efficiency donors due to the markedly reduced synthesis steps and cost (two synthesis steps and 10 $ g −1 cost via eco‐friendly polycondensation). [ 16,17 ] With the joint efforts, the photovoltaic performance based on simple polythiophenes and their functionalized derivatives have delivered the great breakthroughs, with power conversion efficiencies (PCEs) reaching ≈11% and over 17% respectively, [ 16,27,28 ] which further advance the progress of commercial applications of OSCs. [ 29–31 ] For PSCs, polythiophene materials have been applied as hole transport layers (HTLs), due to the favorable energy level alignment and hydrophobicity for high stability.…”

Section: Introductionmentioning

confidence: 99%

Brominated Polythiophene Reduces the Efficiency‐Stability‐Cost Gap of Organic and Quantum Dot Hybrid Solar Cells

Liu

Wang

et al. 2022

Advanced Energy Materials

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have aroused worldwide research efforts to fulfill the carbon-neutrality target in near future. [1,2] The burgeoning solutionprocessed solar cells hold great promise for the drop of global temperature to reach the net-zero scenario by 2050. [3,4] Despite the great advance of organic and hybrid solar cells in the past decade, their commercial applications still suffer from great resistance, compared with the welldeveloped c-silicon photovoltaics. [5][6][7][8] To counter the challenges, more and more efforts have been devoted to developing high-performance and stable solar cells with low-cost photovoltaic materials, [9,10] considering the generally accepted golden triangle (efficiency, lifetime, and cost). [11][12][13] Polythiophenes, one class of the facileprocessable and low-cost photovoltaic materials, have drawn broad research interest in various solution-processed photovoltaics, including organic solar cells (OSCs), [14][15][16][17][18] perovskite solar cells (PSCs) [19][20][21][22][23] and quantum dot solar cells (QDSCs). [24][25][26] For OSCs, polythiophenes have exhibited great competitiveness over high-efficiency donors due to the markedly reduced synthesis steps and cost (two synthesis steps and 10 $ g −1 cost viaThe emerging solution-processed solar cells have attracted worldwide effort in the last decade. Developing efficient, stable, and cost-effective solar cells is strongly desirable in countering the growing global warming. Nevertheless, the photovoltaic performance and stability of hybrid solar cells based on lowcost polythiophenes are far from satisfactory, due to their high-lying energy levels and excessive aggregation. Herein, it is shown that brominated polythiophene (P3HT-Br), prepared via a facile two-step approach can effectively facilitate charge transport and suppress recombination in quantum dot (QD)/ organic heterojunctions. Accordingly, the power conversion efficiency of the optimized hybrid polythiophene/QD cell is boosted from 8.7% to 11% (a 26% increase) with markedly reduced energy loss. More strikingly, the device achieves record-high thermal stability with a lifetime of over 400 h maintaining 80% of the initial performance. Both device efficiency and stability are the best reported for polythiophene/QD hybrid solar cells. Moving forward, brominated polythiophenes hold great application in perovskite solar cells with significantly improved performance and offer new opportunities for other emerging solar cells.

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“…As described earlier, in order to understand the impact of the size of the macrocycle on the electronic and optical properties, three different ring sizes are considered. Cyclic and linear oligothiophenes with 8, 10, and 12 repetitive thiophene units (C[PT] n and L[PT] n , where n = 8, 10, and 12, respectively) were considered 25 . As shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Theoretical studies on donor–acceptor based macrocycles for organic solar cell applications

Haseena

Ravva

2022

Sci Rep

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We have designed a series of new conjugated donor–acceptor-based macrocyclic molecules using state-of-the-art computational methods. An alternating array of donors and acceptor moieties in these macrocycle molecules are considered to tune the electronic and optical properties. The geometrical, electronic, and optical properties of newly designed macrocyclic molecules are fully explored using various DFT methods. Five conjugated macrocycles of different sizes are designed considering various donor and acceptor units. The selected donor and acceptors, viz., thiophene (PT), benzodithiophene (BDT), dithienobenzodithiophene (DTBDT), diketopyrrolopyrrole (DPP), and benzothiazole (BT), are frequently found in high performing conjugated polymer for different organic electronic applications. To fully assess the potential of these designed macrocyclic derivatives, analyses of frontier molecular orbital energies, excited state energies, energy difference between singlet–triplet states, exciton binding energies, rate constants related to charge transfer at the donor–acceptor interfaces, and electron mobilities have been carried out. We found significant structural and electronic properties changes between cyclic compounds and their linear counterparts. Overall, the cyclic conjugated D–A macrocycles’ promising electronic and optical properties suggest that these molecules can be used to replace linear polymer molecules with cyclic conjugated oligomers.

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Polythiophenes for organic solar cells with efficiency surpassing 17%

Cited by 146 publications

References 55 publications

Ternary organic solar cells featuring polythiophene

Ternary organic solar cells featuring polythiophene

Brominated Polythiophene Reduces the Efficiency‐Stability‐Cost Gap of Organic and Quantum Dot Hybrid Solar Cells

Theoretical studies on donor–acceptor based macrocycles for organic solar cell applications

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