tailieunhanh - Solar Cells New Aspects and Solutions Part 13

Tham khảo tài liệu 'solar cells new aspects and solutions part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Hybrid Solar Cells Based on Silicon 411 H layers. In 2002 Meier published a micromorph tandem cell with efficiency of in which the bottom cell was deposited at a rate of Rd nm s with the thickness of 2 pm Meier et al. 2002 . At least in this type of devices the highest efficiencies reported to date are tandem cell consisting of microcrystalline silicon cell and amorphous silicon cell Yan et al. 2010 . Further development and optimization of a-Si H uc-Si H tandems will remain very important because it is expected that in the near future its market share can be considerable. For example in the European Roadmap for PV R D it is predicted that in 2020 the European market share for thin film silicon most probably a-Si H uc-Si H tandems will be 30 . This shows the importance of thin film multibandgap cells as second-generation solar cells. 4. Conclusions and outlook Although conventional SCs based on inorganic materials specially Si exhibit high efficiency very expensive materials and energy intensive processing techniques are required. In comparison with the conventional scheme the hybrid Si-based SC system has advantages such as 1 Higher charging current and longer timescale which make the hybrid system have improved performances and be able to full-charge a storage battery with larger capacity during a daytime so as to power the load for a longer time 2 much more cost effective which makes the cost for the hybrid PV system reduced by at least 15 Wu et al. 2005 . Therefore hybrid SCs can be suitable alternative for conventional SCs. Among hybrid SCs which can be divided into two main groups including HJ hybrid SCs and dye-sensitized hybrid SCs HJ hybrid SCs based on Si demonstrate the highest efficiency. Thus the combination of a-Si pc-Si has been investigated. These configurations of SCs can compensate the imperfection of each other. For example a-Si has a photo-degradation while a pc-Si cell is stable so the combination is well stabilized. .