期刊
IEEE JOURNAL OF PHOTOVOLTAICS
卷 11, 期 1, 页码 232-240出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOTOV.2020.3033426
关键词
Cu(In,Ga)Se-2 (CIGSe) solar cells; device simulations; RbF-postdeposition treatments (PDT); RbInSe2; SCAPS
资金
- German Federal Ministry for Economic Affairs and Energy [0324095E]
A comprehensive device model for CIGSe thin-film solar cells based on numerical simulations is presented, which reproduces experimentally determined characteristics under different Rb-conditionings. The model highlights the impacts of Rb-treatment on the doping density, defect passivation, and photocurrent barrier formation within the CIGSe material.
We present a comprehensive device model for Cu(In,Ga)Se-2 (CIGSe) thin-film solar cells based on numerical SCAPS-1D simulations. The model reproduces the experimentally determined current-voltage and capacitance-voltage characteristics of a Rb-free reference device, a sample that underwent an RbF-treatment, and a sample based on a CIGSe/RbInSe2-stack. According to this model, and in agreement with experimental findings, the main consequences of both Rb-conditionings are an increased doping-density and a defect passivation in the CIGSe as well as the formation of a photocurrent barrier at the hetero interface. With the numerical model established, fundamental aspects of the Rb-conditioning, e.g., the differentiation between its effect on bulk and interface recombination are discussed. Additionally, temperature dependent current-voltage analysis is employed in order to test the model's predictions regarding the interaction of Rb with an injection-current barrier at the back contact of the device. Both the simulation and the temperature dependent current-voltage measurements lead to the result that the RbF-PDT is increasing the height of this barrier, while the deposition of RbInSe2 is decreasing it.
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