研究目的
Investigating the effects of electron-deficient and quinoid central unit engineering on the performance of unfused ring-based A1–D–A2–D–A1-type acceptors in nonfullerene polymer solar cells to achieve high Voc and PCE simultaneously.
研究成果
The study demonstrates that the use of a strong electron-deficient and quinoid difluorobenzothiadiazole unit as the central A2 unit in A1–D–A2–D–A1-type unfused ring NF-SMAs is an effective strategy to achieve high performance in polymer solar cells, with a record PCE of 12.5% and high Voc over 0.90 V.
研究不足
The study focuses on the comparison between two specific NF-SMAs with different central units, and the generalizability to other electron-deficient units or polymer donors is not explored. The practical application in large-scale or flexible solar cells is not addressed.
1：Experimental Design and Method Selection:
Designed and synthesized two unfused ring core-based NF-SMAs with different fluorinated electron-deficient central units.
2：Sample Selection and Data Sources:
Used BO2FIDT-4Cl and BT2FIDT-4Cl as acceptors and PM7 as the polymer donor.
3：List of Experimental Equipment and Materials:
Utilized cyclic voltammetry, atomic force microscopy (AFM), high-resolution transmission electron microscopy (TEM), and grazing incidence X-ray diffraction (GIXD) for characterization.
4：Experimental Procedures and Operational Workflow:
Fabricated solution-processed PSCs with an inverted structure and tested under AM
5：5G solar illumination. Data Analysis Methods:
Analyzed optoelectronic properties, energy levels, charge transport properties, and device performance.
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