Effect of oxygen precipitates in solar grade silicon on minority carrier lifetime and efficiency of solar cells |
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Authors: | SUN Haizhi LIU Caichi HAO Qiuyan WANG Lijian |
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Affiliation: | Institute of Information Functional Material, Hebei University of Technology, Tianjin 300130, China |
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Abstract: | The effect of oxygen precipitates on minority carrier lifetime and performance of solar cell was studied by means of Fourier Transform Infrared Spectroscopy (FTIR), quasi-steady state photoconductance (QSSPCD), optical microscope, spectrumresponse and solar cell efficiency test. The minority carrier lifetime and performance of solar cell reduced depend on oxygen precipitates. A few of oxygen precipitates have formed after single-step annealing; and they do not impact the efficiency dramatically. Pre-annealing at 650 ℃ for 4 h enhances the oxygen precipitation when it is subjected to middle temperature annealing. The solar cells performance decayed sharply. Especially annealing at 950 ℃ for 3 h, the V os and I sc of cells decrease 12% and 25% respectively. Few oxygen precipitates have formed in silicon after high temperature annealing at about 1050 ℃ whether pre-annealing is used or not, and the performance of cells is notbe affected. |
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Keywords: | silicon oxygen precipitate solar cell annealing |
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