研究目的
To demonstrate the fabrication of highly reproducible and efficient tandem solar cells by employing a commercially available material, PEDOT:PSS HTL Solar (HSolar), as the hole transporting material used for the interconnecting layer (ICL).
研究成果
The study successfully demonstrated the use of HSolar as an effective ICL material for tandem organic solar cells, achieving high PCEs and good reproducibility across different laboratories. The results suggest that with further development of donor polymers and device optimization, PCEs exceeding 22% are achievable in the near future.
研究不足
The study acknowledges the challenge of reproducibility in solution-processed tandem solar cells and the complexity of fabrication procedures. The ICL process, while highly compatible, may still require optimization for different photoactive systems.
1：Experimental Design and Method Selection:
The study focused on comparing the performance of tandem solar cells using HSolar versus conventional PEDOT:PSS Al 4083 (c-PEDOT) as the ICL. The methodology included optical modeling to optimize the thickness of the individual subcells and the fabrication of tandem devices with different active layers.
2：Sample Selection and Data Sources:
FTAZ:IT-M and PTB7-Th:IEICO-4F were chosen as the photoactive layers for the front and back cells, respectively, due to their complementary optical absorption and good device performance.
3：List of Experimental Equipment and Materials:
Materials included PEDOT:PSS HTL Solar (HSolar), PEDOT:PSS Al 4083 (c-PEDOT), ZnO nanoparticles, and various organic photoactive materials. Equipment included spin-coaters for film deposition and a solar simulator for device characterization.
4：Experimental Procedures and Operational Workflow:
The fabrication process involved spin-coating the ICL and active layers, followed by thermal annealing. The devices were then characterized under AM1.5G solar spectrum.
5：5G solar spectrum.
Data Analysis Methods:
5. Data Analysis Methods: The performance of the tandem solar cells was analyzed based on power conversion efficiency (PCE), open-circuit voltage (Voc), short-circuit current density (Jsc), and fill factor (FF). Optical modeling was used to simulate the Jsc in each subcell as a function of active layer thicknesses.
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