研究目的
Investigating the effects of molecular weight on the performance of nonfullerene organic photovoltaic cells using a TPD-based wide bandgap donor polymer.
研究成果
The study demonstrates that the molecular weight of the polymer donor significantly affects the performance of nonfullerene organic photovoltaic cells. A high molecular weight improves the π?π stacking ordering, absorption, and nanomorphology of the blend films, leading to a dramatic improvement in power conversion efficiency. The PBDTT-8ttTPD-H:ITIC device achieved a PCE of 11.05%, which is much higher than that of the fullerene-based OPV device.
研究不足
The study focuses on the molecular weight of the polymer donor and its effects on the performance of OPV devices. Other factors such as the choice of acceptor materials and device architecture could also influence the performance but were not extensively explored.
1：Experimental Design and Method Selection:
The study involved synthesizing three batches of PBDTT-8ttTPD with different molecular weights and characterizing their properties. The OPV devices were fabricated with an inverted configuration: ITO/ZnO/active layer/MoO3/Ag.
2：Sample Selection and Data Sources:
The synthesized polymers and ITIC were used as the active layer materials. The weight ratio of the polymer and ITIC was optimized.
3：List of Experimental Equipment and Materials:
Gel permeation chromatography (GPC), thermogravimetric analysis (TGA), cyclic voltammetry (CV), atomic force microscopy (AFM), field-emission transmission electron microscopy (FE-TEM), grazing-incidence wide-angle X-ray scattering (GIWAXS).
4：Experimental Procedures and Operational Workflow:
The polymers were synthesized by Stille coupling polymerization. The OPV devices were fabricated and their performances were evaluated.
5：Data Analysis Methods:
The photovoltaic properties were analyzed using J-V curves and EQE spectra. The morphology and crystallinity of the blend films were analyzed using AFM, FE-TEM, and GIWAXS.
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