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End-Group Modulation in a High Electron Mobility Y-Series Nonfullerene Acceptor Achieved Based on the DFT Method
Zhengli Zhang1,2, Zhao Ding1,2, Xiang Guo1,2
1College of Big Data and Information Engineering, Guizhou University, Huaxi Road, Huaxi District, Guiyang, Guizhou550025, P. R. China.
Modifying the end-groups of Y6 acceptors significantly impacts organic solar cell power conversion efficiency (PCE). Precise engineering enhances electron mobility and PCE, with V7 and V5 showing leading performance.
Area of Science:
- Materials Science
- Organic Electronics
- Photovoltaics
Background:
- Y6 acceptors have improved organic solar cell power conversion efficiency (PCE).
- End-group modification of Y6 significantly influences PCE.
Purpose of the Study:
- To investigate the effect of end-group modification on Y6 acceptors.
- To understand how structural changes impact electronic properties and PCE.
Main Methods:
- Density functional theory (DFT) calculations.
- Analysis of excited states, light absorption, and electron transfer.
- Calculation of electronic properties like electron mobility and ionization potential.
Main Results:
- Eight Y6 derivatives (V1-V7, R) were synthesized and studied.
- V7 exhibited the largest red-shift in UV-visible absorption (787.55 nm).
- V7 and V5 showed superior electronic coupling and high electron mobility (0.9577 and 0.4383 cm² V⁻¹ s⁻¹).
Conclusions:
- Rigid, planar acceptors with uniform local ionization energy distributions enhance electron mobility.
- End-group engineering is a key strategy to tune acceptor properties and boost organic solar cell PCE.
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