研究目的
Investigating the effects of central alkoxy side chain length of a series of narrow bandgap small molecule acceptors (SMAs) on their physicochemical properties and on the photovoltaic performance of the SMA-based polymer solar cells (PSCs).
研究成果
The study concludes that the side chains length plays an important role on the molecular self-assembly, morphology, and photovoltaic performance of the PSCs. The side chain engineering of SMAs provides an effective way to regulate the properties of SMAs and further improve the photovoltaic performance of the PSCs.
研究不足
The study focuses on the effect of alkoxy side chain length on SMAs' properties and PSCs' performance. The intrinsic causes of morphological differences and the correlation between properties and molecular structures need further elucidation.
1：Experimental Design and Method Selection:
The study systematically investigates the effect of alkoxy side chain length on the physicochemical properties and photovoltaic performance of SMAs. It includes the synthesis of new SMAs, characterization of their properties, and fabrication of PSCs.
2：Sample Selection and Data Sources:
Two new SMAs, HO-IDIC-2F and DO-IDIC-2F, were synthesized, and their properties were compared with IDIC-2F and MO-IDIC-2F. Data were acquired through UV–vis absorption spectra, electrochemical cyclic voltammetry, single-crystal analysis, GIWAXS measurements, and photovoltaic performance tests.
3：2F. Data were acquired through UV–vis absorption spectra, electrochemical cyclic voltammetry, single-crystal analysis, GIWAXS measurements, and photovoltaic performance tests.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Instruments used include UV–vis spectrophotometer, electrochemical workstation, single-crystal X-ray diffractometer, GIWAXS setup, and atomic force microscope (AFM). Materials include synthesized SMAs, PM6 as donor, and chloroform as processing solvent.
4：Experimental Procedures and Operational Workflow:
The SMAs were synthesized, characterized, and used to fabricate PSCs. The devices were optimized for donor/acceptor weight ratio, active layer thickness, and annealing temperature.
5：Data Analysis Methods:
Data were analyzed to understand the relationship between side chain length, molecular self-assembly, morphology, and photovoltaic performance.
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