Side chain effect of nonfullerene acceptors on the photovoltaic performance of wide band gap polymer solar cells

Hou, Ran; Feng, Shiyu; Gong, Xue; Liu, Yahui; Zhang, Jicheng; Li, Chun‐Zhu; Bo, Zhishan

doi:10.1016/j.synthmet.2016.07.015

Cited by 13 publications

(2 citation statements)

References 37 publications

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“…Hence, it is important to understand the factors affecting the morphology, packing structure, and charge transport property in thin films. Morphology of organic materials can be altered by suitably choosing the core molecule and placing the substituents which induce H-bonding, π–π stacking, or other intermolecular interactions. − Nonfullerene molecules as an electron acceptor have been used recently in BHJ solar cells as they provide economical alternative to 1-[3-(methoxycarbonyl)propyl]-1-phenyl-[6.6]C 61 ( PCBM ). − Materials having donor (D) and acceptor (A) moieties are referred as a D–A molecule. Properties of D–A-based materials can be tuned by varying the nature of the donor or acceptor moiety.…”

Section: Introductionmentioning

confidence: 99%

Nanoassembly of Dipolar Imidazoanthraquinone Derivatives Leading to Enhanced Hole Mobility

Siddiqui

Bhui²,

Muneer

et al. 2018

J. Phys. Chem. C

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Imidazoanthraquinone-based high dipolar molecules (AQ01 and AQ02) were synthesized and characterized. Photophysical properties in various solvents suggested the polar nature of the ground state for these materials. In addition, fluorescence quenching experiments with the commonly used electron donor poly-3hexylthiophene (P3HT) in bulk heterojunction (BHJ) solar cells ascertained the electron acceptor properties of these molecules. Theoretical calculations based on density functional theory (DFT) gave insight on the dipolar nature, H-bonding, and π−π interaction in different types of supramolecular assemblies of AQ01 and AQ02. Calculations predicted that the π−π interaction via antiparallel orientation and Hbonding with the OH•••OH interaction is favored energetically in AQ01. Morphological studies on thermally evaporated thin films indicated interconnected nanoassemblies in AQ01 while random aggregates in AQ02. Charge transport properties of these molecules were estimated for AQ01/AQ02 and their blends with P3HT. Hole mobility in the AQ01-based device was found to be as high as 2.4 × 10 −4 cm 2 /V s. Favorable morphology in the AQ01 thin film correlates well with the observed high hole mobility. Our results indicate that the dipolar molecule AQ01 has the potential to be used as a nonfullerene-based electron acceptor in BHJ solar cell devices.

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Section: Introductionmentioning

confidence: 99%

Nanoassembly of Dipolar Imidazoanthraquinone Derivatives Leading to Enhanced Hole Mobility

Siddiqui

Bhui²,

Muneer

et al. 2018

J. Phys. Chem. C

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“…Among the reported NFAs, many efforts were devoted to changing the structure of conjugated backbones ,,− and electron-withdrawing end groups. − As we know, in fullerene based PSCs, manipulating the side chains of polymers is of critical importance for enhancing the photovoltaic performance, since the type, position, size, and length of side chains can significantly influence the solubility, intermolecular interaction, charge-transport property, and thin-film morphology. − Therefore, studies of the side chain’s influence on the properties of NFAs are necessary and important, which may provide deeper insight into structure–property relationships. Currently, only a little attention has been paid to side chains attached to the central fused rings; − also, a clear picture of how side chains correlate with the photovoltaic performance of NFAs is absent. In addition, given that 4-(alkylthio)phenyl side chain has been widely employed in conjugated polymers, − its effect on the photovoltaic performance of NFAs is still unknown, however.…”

Section: Introductionmentioning

confidence: 99%

Effect of Non-fullerene Acceptors’ Side Chains on the Morphology and Photovoltaic Performance of Organic Solar Cells

Zhang

Feng

Liu

et al. 2017

ACS Appl. Mater. Interfaces

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Three indacenodithieno[3,2-b]thiophene (IT) cored small molecular acceptors (ITIC-SC6, ITIC-SC8, and ITIC-SC2C6) were synthesized, and the influence of side chains on their performances in solar cells was systematically probed. Our investigations have demonstrated the variation of side chains greatly affects the charge dissociation, charge mobility, and morphology of the donor:acceptor blend films. ITIC-SC2C6 with four branched side chains showed improved solubility, which can ensure the polymer donor to form favorable fibrous nanostructure during the drying of the blend film. Consequently, devices based on PBDB-ST:ITIC-SC2C6 demonstrated higher charge mobility, more effective exciton dissociation, and the optimal power conversion efficiency up to 9.16% with an FF of 0.63, a J of 15.81 mA cm, and a V of 0.92 V. These results reveal that the side chain engineering is a valid way of tuning the morphology of blend films and further improving PCE in polymer solar cells.

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Significantly Increasing the Power Conversion Efficiency by Controlling the Orientation of Nonfullerene Small Molecular Acceptors via Side Chain Engineering

et al. 2020

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Three S,N‐heteroacene nonfullenere small molecular acceptors (NF‐SMAs) with different branching positions on side chains named SNBDT1‐F, SNBDT2‐F, and SNBDT3‐F are synthesized to understand the relationship among branching positions, molecular orientations of NF‐SMAs, and photovoltaic performance of nonfullerene organic solar cells (OSCs). When the branching position is moved close to the conjugated backbone, the proportion of face‐on orientation increases gradually from 4% (SNBDT3‐F), 16% (SNBDT2‐F), to 44% (SNBDT1‐F), suggesting that the molecular orientation changes from edge‐on to face‐on, which has a positive influence on exciton dissociation and charge transport. As a result, the device based on PBDB‐T:SNBDT1‐F shows the highest exciton dissociation probability and carrier mobilities due to the highest proportion of face‐on orientation of SNBDT1‐F. Therefore, the highest power conversion efficiency (PCE) of 12.70% with a high short‐circuit current (Jsc) of 20.97 mA cm−2 and a fill factor of 70.4% is obtained for SNBDT1‐F‐based device, which is much higher than PCEs of SNBDT2‐F‐based (6.57%) and SNBDT3‐F‐based devices (5.87%). Overall, these results provide deep insight into the relationship among the branching positions, molecular orientation, and photovoltaic performance in nonfullerene OSCs, which is important for designing new NF‐SMAs with face‐on orientation and promoting the development of nonfullerene OSCs.

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Side chain effect of nonfullerene acceptors on the photovoltaic performance of wide band gap polymer solar cells

Cited by 13 publications

References 37 publications

Nanoassembly of Dipolar Imidazoanthraquinone Derivatives Leading to Enhanced Hole Mobility

Nanoassembly of Dipolar Imidazoanthraquinone Derivatives Leading to Enhanced Hole Mobility

Effect of Non-fullerene Acceptors’ Side Chains on the Morphology and Photovoltaic Performance of Organic Solar Cells

Significantly Increasing the Power Conversion Efficiency by Controlling the Orientation of Nonfullerene Small Molecular Acceptors via Side Chain Engineering

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