研究目的
Investigating the effect of upside‐down solvent vapor annealing (UD‐SVA) treatment on the performance of nonfullerene organic photovoltaic cells (OPVs).
研究成果
The PCE of OPVs with different UD‐SVA treatment is significantly improved compared with that of the as‐cast OPVs, attributed to the enhanced charge generation, transport, and collection. The OPVs with CS2 UD‐SVA treatment achieve optimized PCE of 13.76% with simultaneously increased JSC and FF. The nonfullerene OPVs exhibit high tolerance of SVA treatment time, suggesting great potential of SVA treatment for improving the performance of nonfullerene OPVs.
研究不足
The study focuses on the effect of UD‐SVA treatment on nonfullerene OPVs, and the comparison with fullerene acceptor OPVs is limited. The nanoscale molecular arrangement variation is challenging to characterize.
1：Experimental Design and Method Selection:
OPVs were fabricated with a polymer donor PM7 and a nonfullerene acceptor IT‐4Cl. The morphology of active layers was optimized by employing UD‐SVA method with different annealing solvents (CS2, CH2Cl2, CHCl3, THF).
2：Sample Selection and Data Sources:
The OPVs were fabricated with a normal structure of ITO/PEDOT:PSS/PM7:IT‐4Cl/PDIN/Al.
3：List of Experimental Equipment and Materials:
Polymer donor PM7, nonfullerene acceptor IT‐4Cl, annealing solvents (CS2, CH2Cl2, CHCl3, THF).
4：Experimental Procedures and Operational Workflow:
The current density–voltage (J‐V) curves of OPVs were measured under AM 1.5G illumination (100 mW cm?2). The effect of UD‐SVA treatment on the performance of OPVs was investigated by adjusting the treatment time in a range from 20 to 300 seconds.
5：5G illumination (100 mW cm?2). The effect of UD‐SVA treatment on the performance of OPVs was investigated by adjusting the treatment time in a range from 20 to 300 seconds.
Data Analysis Methods:
5. Data Analysis Methods: The performance of OPVs was analyzed based on the photovoltaic parameters (PCE, JSC, FF, VOC) obtained from the J‐V curves and EQE spectra.
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