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Solar Cells Silicon Wafer Based Technologies Part 14

Tham khảo tài liệu 'solar cells silicon wafer based technologies part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 316 Solar Cells - Silicon Wafer-Based Technologies We notice that after the irradiation of ITO InP solar cells with an integral proton flux of 1013cm-2 their efficiency decreases by 26 that is less than in the case of Si and GaAs based solar cells. In the spectral characteristics of ITO pInP solar cells after proton irradiation a small decrease of the photosensitivity in the long wavelength region of the spectrum was observed due to the decrease of the diffusion length. Comparing the results of the radiation stability study of ITO InP SC fabricated by spray pyrolysis with the results of similar investigations of other InP based structures it is possible to conclude that in this case the radiation stability is also determined by the low efficiency of radiation defects generation and hence by the low concentration of deep recombination centers reducing the efficiency of solar energy conversion in electric power. 3. Fabrication of ITO nSi solar cells with enlarged area by spray pyrolisys From the brief discussion above it can be concluded that the deposition of ITO layers by spray pyrolysis on the surface of different semiconductor materials allows manufacturing SC through a simple and less expensive technology. The most effective are ITO InP SC but because of a very high cost of the InP crystals they cannot be widely used in terrestrial applications. To this effect ITO nSi SC with the efficiency higher than 10 may be used but it is necessary to develop the technology for SC fabrication with the active area enlarged up to 70-80 cm2 as is the case of traditional silicon SC with p-n junction. 3.1 Deposition of ITO layers on enlarged silicon wafers ITO layers are deposited on the nSi crystals surface using the specially designed installation Simashkevich et al. 2004 Simashkevich et al. 2005 Fig. 15 that has four main units the spraying system 7 the system of displacement and rotation of the support on which the substrate is fixed 4 5 the system of heating the substrate .