| INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY |
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Improvement in IBC-silicon solar cell performance by insertion of highly doped crystalline layer at heterojunction interfaces |
| Hadi Bashiri, Mohammad Azim Karami, Shahramm Mohammadnejad |
| School of Electrical Engineering, Iran University of Science & Technology(IUST), Narmak, Tehran 16844, Iran |
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Abstract By inserting a thin highly doped crystalline silicon layer between the base region and amorphous silicon layer in an interdigitated back-contact (IBC) silicon solar cell, a new passivation layer is investigated. The passivation layer performance is characterized by numerical simulations. Moreover, the dependence of the output parameters of the solar cell on the additional layer parameters (doping concentration and thickness) is studied. By optimizing the additional passivation layer in terms of doping concentration and thickness, the power conversion efficiency could be improved by a factor of 2.5%, open circuit voltage is increased by 30 mV and the fill factor of the solar cell by 7.4%. The performance enhancement is achieved due to the decrease of recombination rate, a decrease in solar cell resistivity and improvement of field effect passivation at heterojunction interface. The above-mentioned results are compared with reported results of the same conventional interdigitated back-contact silicon solar cell structure. Furthermore, the effect of a-Si:H/c-Si interface defect density on IBC silicon solar cell parameters with a new passivation layer is studied. The additional passivation layer also reduces the sensitivity of output parameter of solar cell to interface defect density.
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Received: 27 April 2017
Revised: 13 June 2017
Accepted manuscript online:
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PACS:
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88.40.fc
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(Modeling and analysis)
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88.40.hj
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(Efficiency and performance of solar cells)
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88.40.jj
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(Silicon solar cells)
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85.60.Bt
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(Optoelectronic device characterization, design, and modeling)
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Corresponding Authors:
Mohammad Azim Karami
E-mail: karami@iust.ac.ir
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Cite this article:
Hadi Bashiri, Mohammad Azim Karami, Shahramm Mohammadnejad Improvement in IBC-silicon solar cell performance by insertion of highly doped crystalline layer at heterojunction interfaces 2017 Chin. Phys. B 26 108801
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