Correlation between carbon incorporation and defect formation in quasi-single crystalline silicon

Tsuchiya, Yoichi; Kusunoki, Hiroki; Miyazaki, Naoto; Sameshima, Takashi; Tachibana, Takeshi; Kojima, Takuto; Arafune, Koji; Ohshita, Yoshio; Ogura, Atsushi

doi:10.1109/pvsc.2012.6317622

Cited by 3 publications

(2 citation statements)

References 15 publications

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“…Mono-like crystalline silicon, which has the advantages of both Cz and multicrystalline silicon, is fabricated using a Cz monoseed layer or by optimized growth nucleation during ingot casting [5,6]. Recently, these square mono-like crystalline wafers have gained considerable attention because of their low structural defect density, low fabrication cost, and weak LID [7,8]. Several approaches to improve the quality of mono-like crystalline silicon have been presented [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Subgrains on the Performance of Mono-Like Crystalline Silicon Solar Cells

Zhou

Wang

et al. 2013

International Journal of Photoenergy

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The application of Czochralski (Cz) monocrystalline silicon material in solar cells is limited by its high cost and serious light-induced degradation. The use of cast multicrystalline silicon is also hindered by its high dislocation densities and high surface reflectance after texturing. Mono-like crystalline silicon is a promising material because it has the advantages of both mono- and multicrystalline silicon. However, when mono-like wafers are made into cells, the efficiencies of a batch of wafers often fluctuate within a wide range of >1% (absolute). In this work, mono-like wafers are classified by a simple process and fabricated into laser doping selective emitter cells. The effect and mechanism of subgrains on the performance of mono-like crystalline silicon solar cells are studied. The results show that the efficiency of mono-like crystalline silicon solar cells significantly depends on material defects that appear as subgrains on an alkaline textured surface. These subgrains have an almost negligible effect on the optical performance, shunt resistance, and junction recombination but significantly affect the minority carrier diffusion length and quantum efficiency within a long wavelength range. Finally, an average efficiency of 18.2% is achieved on wafers with hardly any subgrain but with a small-grain band.

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Section: Introductionmentioning

confidence: 99%

Effect of Subgrains on the Performance of Mono-Like Crystalline Silicon Solar Cells

Zhou

Wang

et al. 2013

International Journal of Photoenergy

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“…Gu et al [6] and Stoddard et al [7] introduced basic characteristics of the QSC silicon ingots and performance of the QSC silicon solar cells. Witting et al [8], Tachibana et al [9], and Tsuchiya et al [10] tried to establish the mechanisms of defect generation in the QSC silicon ingots. These studies are helpful for understanding the casting process and improving the quality of QSC silicon ingots.…”

Section: Introductionmentioning

confidence: 99%

Preservation of Seed Crystals in Feedstock Melting for Cast Quasi-Single Crystalline Silicon Ingots

Liu

Zhang

et al. 2013

International Journal of Photoenergy

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The preservation of seed crystals is important for the casting of quasi-single crystalline (QSC) silicon ingots. We carried out transient global simulations of the feedstock melting process in an industrial-sized directional solidification (DS) furnace to investigate key factors influencing seed preservation. The power distribution between the top and side heaters is adjusted in the conventional furnace for multicrystalline silicon ingots and in the evolved furnace with a partition block for QSC silicon ingots. The evolution of the solid-liquid interface for melting and the temperature distribution in the furnace core area are analyzed. The power distribution can influence the temperature gradient in the silicon domain significantly. However, its effect on seed preservation is limited in both furnaces. Seed crystals can be preserved in the evolved furnace, as the partition block reduces the radiant heat flux from the insulation walls to the heat exchange block and prevents the heat flowing upwards under the crucible. Therefore, the key to seed preservation is to control radiant heat transfer in the DS furnace and guarantee downward heat flux under the crucible.

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Distribution and propagation of dislocation defects in quasi-single crystalline silicon ingots cast by the directional solidification method

Zhang¹,

Li²,

Meng³

et al. 2015

Solar Energy Materials and Solar Cells

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Correlation between carbon incorporation and defect formation in quasi-single crystalline silicon

Cited by 3 publications

References 15 publications

Effect of Subgrains on the Performance of Mono-Like Crystalline Silicon Solar Cells

Effect of Subgrains on the Performance of Mono-Like Crystalline Silicon Solar Cells

Preservation of Seed Crystals in Feedstock Melting for Cast Quasi-Single Crystalline Silicon Ingots

Distribution and propagation of dislocation defects in quasi-single crystalline silicon ingots cast by the directional solidification method

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