期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 11, 期 5, 页码 1176-1187出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2021.3095458
关键词
Nickel; Metals; Silicon; Conductivity; Photovoltaic cells; Photonic band gap; Chemicals; Density functional theory (DFT); density of states (DOS); nickel oxide (NiO); passivation contact; p-type conductivity; Si photovoltaics
资金
- ARENA, ARENA's Research and Development Program - Solar PV Research [2017/RND007]
- Qatar National Research Fund (Qatar Foundation) under NPRP [NPRP9-021-009]
Transition metal oxides like NiO have shown potential as hole-selective passivating contact for crystalline silicon solar cells, but doping with multivalent metal cations such as Al, Mg, and Zn can improve their hole-conducting properties and ohmic contact with c-Si. Experimental synthesis of Al-doped NiO films onto c-Si has demonstrated improved contact resistivity compared to undoped NiO, opening up possibilities for future applications in solar cells and other functional materials.
Transition metal oxides such as MoO3, WO3, V2O5, and NiO have shown potential as hole-selective passivating contact for crystalline silicon (c-Si) solar cells. Among them, NiO is a notoriously poor hole-conducting semiconductor. Doping metal oxide with multivalent metal cations is an effective method to modify their electronic properties because dopant-induced favorable defect states play a crucial role in charge carrier transport in device applications. We use first-principles density functional theory to identify suitable metal cations that favorably affect the hole-conducting properties of NiO. We identify Al, Mg, and Zn as suitable dopants for NiO, improving ohmic contact properties with c-Si. Subsequently, Al-doped NiO (AlxNiyO) films were synthesized onto c-Si using an atomic layer deposition supercycle approach. The AlxNiyO films showed a contact resistivity of 331 m omega cm(2) with c-Si, in contrast to undoped NiO where no ohmic contact could be formed. This in-depth computational study followed by the experimental synthesis of AlxNiyO films removes a critical barrier for the future applications of NiO-based carrier-selective passivating contacts for c-Si and other types of solar cells and provides a path for the optimization of other functional materials.
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