Browsing by Author "Sneck, Sami"

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  • Data of ALD Al2O3 rear surface passivation, Al2O3 PERC cell performance, and cell efficiency loss mechanisms of Al2O3 PERC cell
    (2017-04-01) Huang, Haibing; Lv, Jun; Bao, Yameng; Xuan, Rongwei; Sun, Shenghua; Sneck, Sami; Li, Shuo; Modanese, Chiara; Savin, Hele; Wang, Aihua; Zhao, Jianhua
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    This data article is related to the recently published article ‘20.8% industrial PERC solar cell: ALD Al2O3 rear surface passivation, efficiency loss mechanisms analysis and roadmap to 24%’ (Huang et al., 2017) [1]. This paper is about passivated emitter and rear cell (PERC) structures and it describes the quality of the Al2O3 rear-surface passivation layer deposited by atomic layer deposition (ALD), in relation to the processing parameters (e.g. pre-clean treatment, deposition temperature, growth per cycle, and film thickness) and to the cell efficiency loss mechanisms. This dataset is made public in order to contribute to the limited available public data on industrial PERC cells, to be used by other researchers.
  • Data of the recombination loss mechanisms analysis on Al2O3 PERC cell using PC1D and PC2D simulations
    (2017-04-01) Huang, Haibing; Lv, Jun; Bao, Yameng; Xuan, Rongwei; Sun, Shenghua; Sneck, Sami; Li, Shuo; Modanese, Chiara; Savin, Hele; Wang, Aihua; Zhao, Jianhua
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    This data article is related to our recently published article (‘20.8% industrial PERC solar cell: ALD Al2O3 rear surface passivation, efficiency loss mechanisms analysis and roadmap to 24%’, Huang et al., 2017 [1]) where we have presented a systematic evaluation of the overall cell processing and a cost-efficient industrial roadmap for PERC cells. Aside from the information already presented in Huang et al., 2017 [1], here we provide data related to Sectin 3 in Huang et al., 2017 [1] concerning the analysis of the recombination losses׳ mechanisms by PC1D V5.9 and PC2D simulations (Clugston and Basore, 1997, Basore and Cabanas-Holmen, 2011, Cabanas-Holmen and Basore, 2012 and Cabanas-Holmen and Basore, 2012.) [2–5] on our current industrial Al2O3 PERC cell. The data include: i) PC2D simulations on J02, ii) the calculation of series resistance and back surface recombination velocity (BSRV) on the rear side metallization of PERC cell for the case of a point contact, and iii) the PC1D simulation on the cumulative photo-generation and recombination along the distance from the front surface. Finally, the roadmap of the solar cell efficiency for an industrial PERC technology up to 24% is presented, with the aim of providing a potential guideline for industrial researchers.
  • Effective passivation of p+ and n+ emitters using SiO2/Al2O3/SiNx stacks: Surface passivation mechanisms and application to industrial p-PERT bifacial Si solar cells
    (2018-11-01) Huang, Haibing; Modanese, Chiara; Sun, Shenghua; von Gastrow, Guillaume; Wang, Jianbo; Pasanen, Toni P.; Li, Shuo; Wang, Lichun; Bao, Yameng; Zhu, Zhen; Sneck, Sami; Savin, Hele
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    In this paper, we present an effective emitter passivation scheme using SiO2/Al2O3/SiNx stacks. Our study shows that SiO2/Al2O3/SiNx stacks can well passivate both p+ and n+ emitters due to an excellent chemical passivation combined with a weak field-effect passivation. Good quality boron and phosphorus emitters were achieved over a broad emitter-doping range, as demonstrated by post-fired emitter saturation current of 20 and 30 fA cm−2, respectively. Based on the results obtained with SiO2/Al2O3/SiNx emitter passivation, we present an industrial roadmap for a p-PERT bifacial cell structure. Using this roadmap, we demonstrate industrial p-PERT bifacial cells with front side efficiency of 20.5%, rear side efficiency of 19.8% (bifaciality factor BF = 0.98) for rear textured cells and 17.5% (BF = 0.85) for rear planar cells. In particular, the cells with bifacial SiO2/Al2O3/SiNx passivation on both p+ and n+ emitters also demonstrate promising performance and a simplified cell process. The results show that SiO2/Al2O3/SiNx emitter passivation scheme is a promising candidate for photovoltaic industry.
  • Hafnium Aluminate–Polymer Bilayer Dielectrics for Organic Light-Emitting Transistors (OLETs)
    (2024-02-27) Gallegos Rosas, Katherine; Myllymäki, Pia; Saarniheimo, Mikael; Sneck, Sami; Raju, Ramesh; Soldano, Caterina
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    Organic light-emitting transistors are thin-film transistors capable of generating and sensing light under appropriate bias conditions. Achieving a low-voltage operation while maintaining high efficiency can be obtained by using high-mobility semiconductors, highly efficient emissive layers, and high-capacitance dielectrics. We report on the fabrication, dielectric characterization, and implementation of (organic/inorganic) bilayer dielectric stacks in green organic light-emitting transistors. Our dielectric stack includes a nanoscale hafnium aluminate layer fabricated by atomic layer deposition and a thin layer of a polymer dielectric. We found that the hafnium aluminate layer is amorphous in nature and highly transparent in all the visible range. The bilayer stack showed around 10 times higher capacitance per unit area than our polymer reference dielectric. When used as a dielectric in organic light-emitting transistors, this stack enabled low leakage current and operation below 20 V, with a threshold around 6 V and similar efficiencies. Thus, engineering the dielectric layer can enable the tuning of the device working conditions and performances while keeping robustness and negligible leakage values. Thus, these findings open the way to use nanoscale organic/inorganic bilayer dielectrics to enable low-bias, low-power consumption optoelectronic devices of relevance for next-generation electronics applications.
  • Industrial Applicability of Antireflection-Coating-Free Black Silicon on PERC Solar Cells and Modules
    (2018) Pasanen, Toni; Vähänissi, Ville; Wolny, Franziska; Oehlke, Alexander; Wagner, Matthias; Juntunen, Mikko A.; Heikkinen, Ismo T. S.; Salmi, Emma; Sneck, Sami; Vahlman, Henri; Tolvanen, Antti; Hyvärinen, Jaakko; Savin, Hele
     A4 Artikkeli konferenssijulkaisussa
    Black silicon (b-Si) is of particular interest within the photovoltaic community due to its ability to texture diamond wire-sawn multicrystalline silicon wafers. In this work, we apply a deep dry-etched black silicon nanotexture, which possesses less than 1 % solar-weighted reflectance with no antireflection coating (ARC), to industrial Passivated Emitter and Rear Cells (PERC). Additionally, the cells are processed further into small solar modules, which are characterized by their electrical and optical performance. The fragile nanostructures remain intact during industrial cell and module fabrication, maintaining the excellent optical properties until the final product. We show that b-Si modules with a typical cover glass retain their performance until incident angles larger than 60°, whereas the heavily increased reflectance of acidic-textured modules decreases their efficiency already after a 30° tilt. Furthermore, at an incidence angle of 70°, the efficiency of b-Si modules has reduced only 7 %, while that of the acidic-textured equivalents has decreased more than 25 %. Hence, the excellent optical properties of ARC-free b-Si are maintained also at module level. The results demonstrate that deep dry-etched b-Si nanostructures are fully applicable to current industrial PERC production facilities.
  • Shrinkage control in secondary coating process of optical fibers
    (2001) Sneck, Sami
     Helsinki University of Technology | Master's thesis