研究目的
To develop novel materials with a defined combination of properties ensuring sufficient reliability and scalability of the process for the production of large-area organic solar cells, in addition to good efficiency and operation stability of the devices.
研究成果
The designed polymer P1 demonstrated promising performance as an absorber material for organic solar cells, with a power conversion efficiency of 7.5% in small-area devices and 4.2% in larger area modules. The devices also showed promising outdoor stability, maintaining 60–70% of the initial efficiency after 20 sun days of exposure to natural sunlight. These results highlight the potential of P1 and similar polymers for the large-scale production of efficient and stable organic photovoltaic devices under ambient conditions.
研究不足
The study acknowledges the drop in performance of organic solar cells when scaling up to larger-area devices fabricated using roll-to-roll compatible coating and printing techniques. The majority of reported efficiencies of OSCs or modules with an active area of 10–20 cm2 range from 5% to 7.5%, indicating a significant efficiency roll-off compared to small-area devices.
1：Experimental Design and Method Selection:
The study involved the synthesis of two novel polymers comprising thiazolothiazole units and their performance evaluation as absorber materials for organic solar cells and modules. The methodology included the use of slot-die coating as a roll-to-roll compatible and industry-relevant film deposition technique.
2：Sample Selection and Data Sources:
The polymers P1 and P2 were synthesized and characterized. Their performance was evaluated in bulk heterojunction solar cells with the conventional architecture.
3：List of Experimental Equipment and Materials:
The study utilized a KHS Steuernagel solar simulator for illumination, Advantest 6240A source-measurement units for J-V curve recording, and various processing additives for film optimization.
4：Experimental Procedures and Operational Workflow:
The photovoltaic properties were evaluated in bulk heterojunction solar cells with an active area of 0.3 cm2. The performance was optimized by adjusting polymer/PCBM weight ratios, film thickness, and thermal annealing regimes.
5：3 cmThe performance was optimized by adjusting polymer/PCBM weight ratios, film thickness, and thermal annealing regimes.
Data Analysis Methods:
5. Data Analysis Methods: The performance of solar cells was analyzed under simulated AM1.5G illumination. Charge carrier mobilities were studied using the space-charge limited current (SCLC) method, and the impact of bimolecular recombination was investigated by measuring the dependence of JSC against Plight.
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