研究目的
Investigating the enhancement of electron transport in nonfullerene acceptor based thick active layers using high hole mobility polymers to achieve high fill factor and efficiency in polymer solar cells.
研究成果
The study demonstrates that high hole mobility polymers can significantly enhance electron transport in nonfullerene acceptor based thick active layers, leading to high fill factors and efficiencies in polymer solar cells. This approach paves the way for developing high-performance thick-film PSCs suitable for large-scale production.
研究不足
The study focuses on binary nonfullerene active layers and may not directly apply to ternary or other complex systems. The enhancement of electron transport is specific to the combination of high hole mobility polymers and IEICO-4F acceptor.
1：Experimental Design and Method Selection
The study employed high hole mobility polymers (Si25-L, Si25-H1, Si25-H2) with varying molecular weights to pair with a nonfullerene acceptor (IEICO-4F). The photovoltaic properties were investigated using inverted configuration PSCs with ZnO/PFN-Br bi-interlayers.
2：Sample Selection and Data Sources
Three Si25 polymers with different molecular weights and a nonfullerene acceptor IEICO-4F were used. The samples were characterized using various techniques including AFM, GIWAXS, and SCLC.
3：List of Experimental Equipment and Materials
Instruments used include atomic force microscopy (AFM), grazing incidence wide-angle X-ray scattering (GIWAXS), and space charge limited current (SCLC) method for mobility measurements.
4：Experimental Procedures and Operational Workflow
The active layers were fabricated by spin-coating with hot chlorobenzene solutions containing a minor 1-chloronaphthalene (CN) as solvent additive, followed by thermal annealing at 80 °C for 5 min.
5：Data Analysis Methods
Data analysis involved fitting transient PL kinetics with bi-exponential function, calculating coherence lengths from GIWAXS data, and determining mobilities using SCLC method.
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