Isomeric Monomer Engineering of Regioregular Polymer Acceptors for Efficient All-Polymer Solar Cells

Cui, Naizhe; Li, Xiaoxiao; Yang, Hang; Feng, Jun; Hu, Kewei; Jiang, Xinyu; Fan, Hongyu; Wu, Yue; Cui, Chaohua

doi:10.1021/acsapm.3c02752

Cited by 2 publications

(1 citation statement)

References 41 publications

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“…Then, the μ h /μ e values were calculated to assess the charge transport balance between the holes and electrons of the photovoltaic devices. Compared to D18-Cl:L8-BO binary devices and high O-IDTBR ternary devices, the optimized ternary devices achieved more balanced hole/electron transport with μ h /μ e values much closer to 1 (1.064) …”

Section: Resultsmentioning

confidence: 99%

Exploiting Two Nonfullerene Acceptors for Enhanced Light Absorption and Reduced Charge Recombination in High-Efficiency Polymer Solar Cells

Liu,

Sun

2024

ACS Appl. Polym. Mater.

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Polymer solar cells (PSCs) based on a polymer donor (D18-Cl) and a nonfullerene acceptor (L8-BO) have high power conversion efficiencies (PCEs). However, further increases in the PCE need to cause an enhancement in the light absorption and a reduction in the charge recombination. Here, we selected highly crystalline O-IDTBR as a third-component material that is selectively miscible within the acceptor phase. The optimized ternary PSCs exhibited a PCE of 17.26%; this result was caused by an increase in the shortcircuit current density (J SC ) with a value of 27.35 mA cm −2 when an suitable amount of O-IDTBR replaced L8-BO. The increased J SC was attributed to the efficient long-wavelength light absorption with respect to those of PM6 and L8-BO. Adding a suitable amount of O-IDTBR further enhanced the crystallization and intermolecular interactions of the ternary photoactive layer; this was beneficial for the charge transport and for improving the photovoltaic performance. At the same time, the optimized phase separation due to the incorporation of O-IDTBR into the D18-Cl:L8-BO binary films led to enhanced photostability and a decreased attenuation ratio under continuous light exposure.

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Section: Resultsmentioning

confidence: 99%

Exploiting Two Nonfullerene Acceptors for Enhanced Light Absorption and Reduced Charge Recombination in High-Efficiency Polymer Solar Cells

Liu,

Sun

2024

ACS Appl. Polym. Mater.

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Impact of Alkoxy Side Chains on the Quinoxaline-Based Electron Acceptors for Efficient Organic Solar Cells

Li,

Yuan,

Yang

et al. 2024

ACS Appl. Mater. Interfaces

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In this work, three alkoxy-substituted quinoxaline core-based small-molecule acceptors (BQO-F, BQDO-F, and BQDO-Cl) are developed to elucidate the impact of ethoxy substituents on the physicochemical and photoelectric properties. Comparative analysis reveals that dialkoxy-substituted BQDO-F has a more planar molecular skeleton, a red-shifted absorption spectrum, upshifted energy levels, stronger crystallinity, and reduced energetic disorder compared to the monoalkoxysubstituted BQO-F. Although the replacement of fluorine atoms with chlorine atoms on the end-capped units of BQDO-F leads to a bathochromically shifted absorption spectrum, the resulting molecule BQDO-Cl shows worse π−π packing order compared to BQDO-F. Benefiting from the more favorable active layer morphology and improved carrier dynamics, the PBDB-T:BQDO-F-based organic solar cell achieves a much higher power conversion efficiency (PCE) of 16.41% compared to that of 14.48% obtained in the BQO-F-based device. In comparison with the BQDO-F-based device, the higher voltage loss of the BQDO-Cl-based device results in a lower PCE of 15.89%. The results clarify the effects of ethoxy substituents and end-capped substitutions of quinoxaline core-based small-molecule acceptors on efficient organic solar cells.

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Isomeric Monomer Engineering of Regioregular Polymer Acceptors for Efficient All-Polymer Solar Cells

Cited by 2 publications

References 41 publications

Exploiting Two Nonfullerene Acceptors for Enhanced Light Absorption and Reduced Charge Recombination in High-Efficiency Polymer Solar Cells

Exploiting Two Nonfullerene Acceptors for Enhanced Light Absorption and Reduced Charge Recombination in High-Efficiency Polymer Solar Cells

Impact of Alkoxy Side Chains on the Quinoxaline-Based Electron Acceptors for Efficient Organic Solar Cells

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