摘要
All-perovskite tandem solar cells are a promising photovoltaic technology,but their efficiency is strongly limited by the tunnel junction.The tunnel junction enables carrier tunneling and recombination,which depend on the interfacial band alignment.Through quantitative simulations using Silvaco Technology Computer Aided Design(TCAD),we find that hole tunneling is intrinsically more difficult than electron tunneling in the tunnel junction.Efficient tunnel junctions require minimizing the barrier for holes while maintaining a moderate barrier for electrons to balance tunneling.For the SnO2/metal/PEDOT:PSS tunnel junction in all-perovskite tandem solar cells,tuning the metal work function achieves balanced electron and hole tunneling,reduces junction resistance,and directly enhances performance of tandem solar cells.This work provides quantitative design rules for tunnel junction optimization,offering a clear pathway toward high-performance allperovskite tandem solar cells.
基金
supported by the National Natural Science Foundation of China(62574094,62174064,52330004)
the National Key R&D Program of China(2023YFB3608900,2022YFB4200304)
the Innovation Project of Optics Valley Laboratory(OVL2024ZD002)
International Science and Technology Cooperation Projects of Hubei Province(GJHZ202500083)
Guangdong Provincial Key Laboratory of Manufacturing Equipment Digitization(2023B1212060012)
Hubei Optical Fundamental Research Center,the University of New South Wales-Huazhong University of Science and Technology Strategic Partnership Research Seed Fund
Wuhan Science and Technology Innovation Bureau(2024010702020023).
