Rationally regulating the π-bridge of small molecule acceptors for efficient organic solar cells

Wang, Pengchao; Li, Yonghai; Han, Chenyu; Wang, Junjie; Bi, Fuzhen; Zheng, Nan; Yang, Jiaying; Wang, Jiuxing; Bao, Xichang

doi:10.1039/d2ta05157e

Cited by 14 publications

(7 citation statements)

References 51 publications

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“…Therefore, the molecules’ crystallinity is increased to attain higher solubility in the polar solvents, resulting from the tight packing of the structural parts. The higher excellent value of the dipole moment, the higher crystallinity and solubility of the polar solvents, which becomes more convenient . The molecules with negligible D values are mostly not soluble in polar solvents.…”

Section: Resultsmentioning

confidence: 99%

“…The higher excellent value of the dipole moment, the higher crystallinity and solubility of the polar solvents, which becomes more convenient. 55 The molecules with negligible D values are mostly not soluble in polar solvents. This fact is not universal; however, the planarity of the molecule decides the reactivity toward solvents and charge mobility.…”

Section: Dipole Moment (D)mentioning

confidence: 99%

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High-Efficiency and Low-Energy-Loss Organic Solar Cells Enabled by Tuning the End Group Modification of the Terthiophene-Based Acceptor Molecules to Enhance Photovoltaic Properties

Rehman,

Hameed,

Khera

et al. 2023

ACS Omega

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In the current study, six nonfullerene small acceptor molecules were designed by end-group modification of terminal acceptors. Density functional theory calculations of all designed molecules were performed, and optoelectronic properties were computed by employing different functionals. Every constructed molecule has a significant bathochromic shift in the maximum absorption value (λ max ) except AM6. AM1−AM4 molecules represented a narrow band gap (E g ) and low excitation energy values. The AM1−AM4 and AM6 molecules have higher electron mobility. Comparing AM2 to the reference molecule reveals that AM2 has higher hole mobilities. Compared to the reference molecule, all compounds have excellent light harvesting efficiency values compared to AM1 and AM2. The natural transition orbital investigation showed that AM5 and AM6 had significant electronic transitions. The open-circuit voltage (V oc ) values of the computed molecules were calculated by combining the designed acceptor molecules with PTB7-Th. In light of the findings, it is concluded that the designed molecules can be further developed for organic solar cells (OSCs) with superior photovoltaic abilities.

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Section: Resultsmentioning

confidence: 99%

Section: Dipole Moment (D)mentioning

confidence: 99%

High-Efficiency and Low-Energy-Loss Organic Solar Cells Enabled by Tuning the End Group Modification of the Terthiophene-Based Acceptor Molecules to Enhance Photovoltaic Properties

Rehman,

Hameed,

Khera

et al. 2023

ACS Omega

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“…[ 34 ] In π‐bridge engineering, the π‐bridge units act as bridges connecting between the donor cores and the acceptor ending groups, which not only expand and extend the A‐D‐A conjugated structure, but also affect the planarity of the main chain as well as the aggregation behavior of the entire molecule. [ 35‐40 ] Therefore, it is also one of the considerable research directions for the molecular design of high‐performance OSCs to ameliorate aggregation behavior, thus finely tuning the film morphology through the π‐bridge adjustment. [ 41‐42 ]…”

Section: Background and Originality Contentmentioning

confidence: 99%

Enhanced Performance via π‐Bridge Alteration of Porphyrin‐Based Donors for All‐Small‐Molecule Organic Solar Cells

Shen

Ren

et al. 2023

Chin. J. Chem.

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Comprehensive Summary All‐small‐molecule organic solar cells (ASM OSCs) are promising for commercial application due to the well‐defined chemical structures, convenient purifying process and low batch‐to‐batch variation. However, the similarity of molecule structures between small molecule donors and acceptors makes a hard regulation of their blend morphology, which will limit the efficiency. One of the efficient approaches is structural tuning, among which the π‐bridge engineering is considered as a good method to improve the blend morphology. Herein, we synthesized two porphyrin‐based small‐molecule donors, Por‐BR and Por‐TR, by introducing alkoxybenzene and alkylthiophene as π bridges. The Por‐BR‐based active layer produces poor morphology and does not achieve satisfying device efficiency because of the excessive aggregation tendency. As for Por‐TR, an efficiency of 11.26% is achieved with such a high open circuit voltage of 0.904 V. This study shows that altering π‐bridge units can facilitate the improvement of film morphology, finally increase the device performance, and also provides a sample for molecule designing in terms of structure‐property correlation.

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“…The ternary devices with WA1 as the guest produced 18.15% efficiency. 145 Besides, the unilateral p-bridge strategy was also employed in A-DA 0 D-A type acceptors. Bo and coworkers 146 studied the p-bridge effect of 3,4-bis-(octyloxy)thiophene (BOT) and reported three NFEAs, namely L4, L5, and L6, as displayed in Fig.…”

Section: Unilateral P-bridge Strategy In Nfeasmentioning

confidence: 99%

Versatile π-bridges in nonfullerene electron acceptors of organic solar cells

Feng

Wang

et al. 2023

Mater. Chem. Front.

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Rationally regulating the π-bridge of small molecule acceptors for efficient organic solar cells

Abstract: Nonfullerene acceptors have boosted the power conversion efficiencies (PCE) of organic solar cells (OSCs). The rigid fused-ring molecular skeletons enable decent molecular planarity and stacking orientations, but suffer from tedious...

Cited by 14 publications

References 51 publications

High-Efficiency and Low-Energy-Loss Organic Solar Cells Enabled by Tuning the End Group Modification of the Terthiophene-Based Acceptor Molecules to Enhance Photovoltaic Properties

High-Efficiency and Low-Energy-Loss Organic Solar Cells Enabled by Tuning the End Group Modification of the Terthiophene-Based Acceptor Molecules to Enhance Photovoltaic Properties

Enhanced Performance via π‐Bridge Alteration of Porphyrin‐Based Donors for All‐Small‐Molecule Organic Solar Cells

Versatile π-bridges in nonfullerene electron acceptors of organic solar cells

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