期刊
ADVANCED SCIENCE
卷 8, 期 5, 页码 -出版社
WILEY
DOI: 10.1002/advs.202003245
关键词
carrier‐ selective contact; electrostatic adsorption; Lewis bases; passivating contact; silicon solar cells
资金
- National Natural Science Foundation of China [51601210, 61874177]
- National Key Research and Development of China [2016YFB0700202]
Efficient passivating carrier-selective contacts (PCSCs) have been achieved using a light-promoted adsorption method, establishing high-density PEI monolayers for n-type silicon solar cells. This approach not only improves device efficiency, but also provides a convenient coating deposition strategy for various applications.
Achieving efficient passivating carrier-selective contacts (PCSCs) plays a critical role in high-performance photovoltaic devices. However, it is still challenging to achieve both an efficient carrier selectivity and high-level passivation in a sole interlayer due to the thickness dependence of contact resistivity and passivation quality. Herein, a light-promoted adsorption method is demonstrated to establish high-density Lewis base polyethylenimine (PEI) monolayers as promising PCSCs. The promoted adsorption is attributed to the enhanced electrostatic interaction between PEI and semiconductor induced by the photo-generated carriers. The derived angstrom-scale PEI monolayer is demonstrated to simultaneously provide a low-resistance electrical contact for electrons, a high-level field-effect passivation to semiconductor surface and an enhanced interfacial dipole formation at contact interface. By implementing this light-promoted adsorbed PEI as a single-layered PCSC for n-type silicon solar cell, an efficiency of 19.5% with an open-circuit voltage of 0.641 V and a high fill factor of 80.7% is achieved, which is one of the best results for devices with solution-processed electron-selective contacts. This work not only demonstrates a generic method to develop efficient PCSCs for solar cells but also provides a convenient strategy for the deposition of highly uniform, dense, and ultra-thin coatings for diverse applications.
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