RESEARCH ON BaFx ELECTRON-SELETIVE CONTACT IN CRYSTALLINE SILLICON SOLAR CELLS

Di Chong; Li Wenhao; Chen Jingwei; Ding Yang; Wei Deyuan; Xu Ying

doi:10.19912/j.0254-0096.tynxb.2024-0284

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (6) : 245-250. DOI: 10.19912/j.0254-0096.tynxb.2024-0284

RESEARCH ON BaF_x ELECTRON-SELETIVE CONTACT IN CRYSTALLINE SILLICON SOLAR CELLS

Di Chong¹, Li Wenhao¹, Chen Jingwei¹, Ding Yang^1,2, Wei Deyuan³, Xu Ying¹

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Abstract

The material properties of an ultrathin barium fluoride （BaF_x） thin film prepared by electron beam evaporation method are investigated and applied as a novel, undoped selective contact transport material for crystalline silicon heterojunction batteries that transport electrons while blocking holes. Ultraviolet photoelectron spectroscopy （UPS） tests show that the BaF_x/Al interface has a work function of 2.55 eV, which is lower than that of aluminum itself （4.26 eV）, enabling a selective transport function for electrons. The addition of BaF_x leads to the formation of an ohmic contact between the aluminum electrodes and the crystalline silicon, and achieving a low contact resistivity of 23.98 mΩ·cm². The use of this heterostructure as a doping-free whole backside ohmic contact for lightly doped n-type monocrystalline silicon solar cells leads to an increase in both the cell's fill factor and short-circuit current density, and ultimately achieves an increase in the cell's absolute energy conversion efficiency of 2.53%.

Key words

solar cells / silicon heterojunction / dopant-free / electron selective contact

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Di Chong, Li Wenhao, Chen Jingwei, Ding Yang, Wei Deyuan, Xu Ying. RESEARCH ON BaF_x ELECTRON-SELETIVE CONTACT IN CRYSTALLINE SILLICON SOLAR CELLS[J]. Acta Energiae Solaris Sinica. 2025, 46(6): 245-250 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0284

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