研究目的
Investigating the electrical and optical properties of a new transparent conductive adhesive (TCA) for use in two-terminal silicon-based tandem solar cells, focusing on minimizing connecting resistivity and reflection losses at the interfaces.
研究成果
The developed TCA shows promising electrical and optical properties for tandem solar cells, with a minimum connecting resistivity of 17 ?cm2 and the potential to reduce reflection losses to <5% using a TiO2 ARC. Further optimization of the bonding process could enhance the efficiency of glued tandem solar cells beyond current single-junction silicon solar cell records.
研究不足
The study is limited by the technical constraints of the hot-pressing equipment, which caps the temperature at 300°C. Additionally, the homogeneity of the bond layer affects the electrical performance, indicating areas for process optimization.
1：Experimental Design and Method Selection:
The study combines spray pyrolysis and a sol-gel like process to develop a TCA. The adhesive layer's electrical and optical properties are characterized, and its performance in tandem solar cells is simulated.
2：Sample Selection and Data Sources:
Quartered 4” n-type FZ-Si substrates with highly doped TOPCon surfaces are used. The TCA is applied by spray coating, and samples are bonded using a hot press.
3：List of Experimental Equipment and Materials:
Includes a self-built spray coater, Collin PCS II hot press, UV-Vis spectrometer, and Scanning Acoustic Microscopy (SAM) for analysis.
4：Experimental Procedures and Operational Workflow:
The TCA is spray-coated onto substrates at 100°C, followed by hot pressing at 300°C to calcinate the adhesive layer. Parameters like pressure, pressing time, and TCA thickness are varied.
5：Data Analysis Methods:
Electrical characterization involves measuring I-V characteristics in a 4-point configuration. Optical analysis uses UV-Vis spectrometry and transfer matrix simulations to assess reflection losses.
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