What does this research mean for the field?

In double-branched indolo[2,3-b]quinoxaline photosensitizers, a D1-D1 linkage topology achieves superior power conversion efficiency (12.65%) in dye-sensitized solar cells compared to D2-D2 linkages or single-branch analogues by enhancing intramolecular charge transfer and suppressing interfacial charge recombination. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

What question did this study set out to answer?

To systematically evaluate how donor-donor linkage positions (D1-D1 versus D2-D2) in double-branched indolo[2,3-b]quinoxaline photosensitizers influence photovoltaic performance in dye-sensitized solar cells.

September 2, 2026Polycyclic aromatic compounds

Systematic Linkage Engineering of Double-Branched Metal-Free Indolo2,3-bQuinoxaline Photosensitizers for High-Efficiency Dye-Sensitized Solar Cells

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Authors

NANouf Alharbi TMTahani Mashyakhi RQRifan Yahya Hussain Qassadi

Discussion

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Overview

Experimental study demonstrates 12.65% power efficiency in double-branched indoloquinoxaline solar cells, indicating that donor-donor linkage topology effectively curbs charge recombination.

Key Points

To systematically evaluate how donor-donor linkage positions (D1-D1 versus D2-D2) in double-branched indolo[2,3-b]quinoxaline photosensitizers influence photovoltaic performance in dye-sensitized solar cells.
Synthesized three metal-free dyes (NQ-1, NQ-2, and NQ-3) using indole (D1), fused indolo[2,3-b]quinoxaline (D2), and 4-(2-cyanoacetamido)benzoic acid (π-A) in single or double-branched hexyl-linked configurations.
Evaluated optical, electrochemical, and photovoltaic characteristics using UV-Vis spectroscopy, cyclic voltammetry, IPCE, current density-voltage measurements, and electrochemical impedance spectroscopy.
Modeled frontier molecular orbital distributions and electrostatic potentials using density functional theory at the CAM-B3LYP/6-31G(d,p) level.
NQ-2 exhibited the longest-wavelength absorption maximum at 608 nm and attained an IPCE response of approximately 90% across 500–598 nm.
NQ-2-sensitized solar cells with chenodeoxycholic acid co-adsorbent achieved a power conversion efficiency of 12.65%, outperforming NQ-1, NQ-3, and the benchmark N719 dye.
Impedance spectroscopy showed NQ-2 yielded the highest charge recombination resistance (60.81 Ω cm⁻²) and longest electron lifetime (41.35 ms).

Cite This Study

Alharbi et al. (2026) studied this question.

synapsesocial.com/papers/6a97e25ec562ede874ec6844 https://doi.org/10.1080/10406638.2026.2724861

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September 2, 2026Polycyclic aromatic compounds

Systematic Linkage Engineering of Double-Branched Metal-Free Indolo2,3-bQuinoxaline Photosensitizers for High-Efficiency Dye-Sensitized Solar Cells

View Full Paper

Ask AI

Bookmark

Authors

NANouf Alharbi TMTahani Mashyakhi RQRifan Yahya Hussain Qassadi

Discussion

Member takes

Overview

Experimental study demonstrates 12.65% power efficiency in double-branched indoloquinoxaline solar cells, indicating that donor-donor linkage topology effectively curbs charge recombination.

Key Points

To systematically evaluate how donor-donor linkage positions (D1-D1 versus D2-D2) in double-branched indolo[2,3-b]quinoxaline photosensitizers influence photovoltaic performance in dye-sensitized solar cells.
Synthesized three metal-free dyes (NQ-1, NQ-2, and NQ-3) using indole (D1), fused indolo[2,3-b]quinoxaline (D2), and 4-(2-cyanoacetamido)benzoic acid (π-A) in single or double-branched hexyl-linked configurations.
Evaluated optical, electrochemical, and photovoltaic characteristics using UV-Vis spectroscopy, cyclic voltammetry, IPCE, current density-voltage measurements, and electrochemical impedance spectroscopy.
Modeled frontier molecular orbital distributions and electrostatic potentials using density functional theory at the CAM-B3LYP/6-31G(d,p) level.
NQ-2 exhibited the longest-wavelength absorption maximum at 608 nm and attained an IPCE response of approximately 90% across 500–598 nm.
NQ-2-sensitized solar cells with chenodeoxycholic acid co-adsorbent achieved a power conversion efficiency of 12.65%, outperforming NQ-1, NQ-3, and the benchmark N719 dye.
Impedance spectroscopy showed NQ-2 yielded the highest charge recombination resistance (60.81 Ω cm⁻²) and longest electron lifetime (41.35 ms).

Cite This Study

Alharbi et al. (2026) studied this question.

synapsesocial.com/papers/6a97e25ec562ede874ec6844 https://doi.org/10.1080/10406638.2026.2724861

View Full Paper

Ask AI

Bookmark