Silicon Ingot Quality and Resulting Solar Cell Performance

Gibaja, Fabien; Bartel, T.; Heuer, M.; Graf, Oliver; Kaes, Martin; Kirscht, F.G.

doi:10.1016/j.egypro.2013.07.316

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…e morphology of CdSe QDs and their PL intensity is generally utilized to confirm the reducing ligands effect, which we have discussed elsewhere [20]. In this work, the effect of the reduced ligand can be dominantly observed from its J SC and resistant values [21,22]. e removed ligand leads to the higher conductivity of QDs, which contributed to the increased J SC overall.…”

Section: Resultsmentioning

confidence: 78%

Enhanced Device Performance of Bulk Heterojunction (BHJ) Hybrid Solar Cells Based on Colloidal CdSe Quantum Dots (QDs) via Optimized Hexanoic Acid-Assisted Washing Treatment

Madsuha

Yuwono

Sofyan

et al. 2019

Advances in Materials Science and Engineering

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As-synthesized colloidal quantum dots (QDs) are usually covered by an organic capping ligand. These ligands provide colloidal stability by preventing QDs agglomeration. However, their inherent electrical insulation properties deliver a problem for hybrid solar cell application, disrupting charge transfer, and electron transport in conjugated polymer/QDs photoactive blends. Therefore, a surface modification of QDs is crucial before QDs are integrated into solar cell fabrication. In this work, enhancement of power conversion efficiency (PCE) in bulk heterojunction (BHJ) hybrid solar cells based on hexadecylamine- (HDA-) capped CdSe quantum dots (QDs) has been achieved via a postsynthetic hexanoic acid washing treatment. The investigation of the surface modification was performed to find the optimum of washing time and their effect on solar cell devices performance. Variation of washing time between 16 and 30 min has been conducted, and an optimum washing time was found at 22 min, resulting in a high PCE of 2.81%. The efficiency enhancement indicates improved electron transport, contributing in an increased short-circuit current density of solar cell devices.

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Section: Resultsmentioning

confidence: 78%

Enhanced Device Performance of Bulk Heterojunction (BHJ) Hybrid Solar Cells Based on Colloidal CdSe Quantum Dots (QDs) via Optimized Hexanoic Acid-Assisted Washing Treatment

Madsuha

Yuwono

Sofyan

et al. 2019

Advances in Materials Science and Engineering

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“…However, the electron activity of some impurities may be dependent on their chemical configuration or their physical distribution in the crystal (complexed with other impurities, dissolved or agglomerated). These effects can be investigated by the electronic properties of crystallized silicon and are therefore used as another measure of the quality of the raw material [107]. Structural and electronic quality can be measured by optical inspection, lifetime, traps density and photoluminescence.…”

Section: Characterization Techniques For C-si Ingots and Wafersmentioning

confidence: 99%

Evaluation of impurities in the Brazilian solar grade silicon and LeTID investigations in p-type multi-Si

Knob¹

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KNOB, D. Evaluation of impurities of the Brazilian solar grade silicon and LeTID investigations in p-type multi-Si. 2019. 119 p. Thesis (Doctorate in Nuclear Technology-Materials)-Instituto de Pesquisas Energéticas e Nucleares-IPEN-CNEN/SP. São Paulo The cost reductions and the environmental benefits aligned with global concerns about climate change have made solar photovoltaic technology the most installed source of energy in the power sector worldwide. Brazil has the largest know reserves of silicon in the world. Therefore, there is a huge potential for developing a national technology for purifying and manufacturing silicon wafers within an increasingly competitive and efficient photovoltaic industry. The IPEN initiative of investigating the production of metallic silicon and metallurgical route purification required a characterization of samples in different stages of production from quartz to wafer and understanding the characterization methods for silicon wafers taking into account the main defect mechanisms such as light-induced degradation. Metalic silicon is produced in IPEN via magnesiothermal reduction through acid leaching to form a metallurgical grade silicon with relatively low impurities. One more acid leaching step resulted in a specific ultrametallurgical grade silicon. The same acid leaching was processed in a commercially available Brazilian-made metallurgical grade silicon produced via carbothermal reduction. All samples impurities was measured by ICP-OES. The result is a material with ultra-metallurgical grade silicon content with excess of B and P. While wafer characterization was studied, an extensive investigation was taken on LeTID, which causes remain unknown, at Institute for Energy Technology, Norway. Neighboring high performance mc-Si p-type wafers were tested in different firing process conditions. The effects was investigated in terms of defects activation and a corresponding lifetime degradation and recovery at illuminated annealing. A sample with almost fully suppressed LeTID is shown. A new method have been proposed to separate Boron Oxygen-Light Induced Degradation effects of LeTID, enabling to measure even where it was thought to be fully suppressed. New models for LeTID defect formation and suppression are proposed. Both silicon purification and light-induced degradation characterization in mc-Si studies shows a wide range of research on new production routes that may require tailored processes of crystallization and solar cell manufacturing such as gettering and firing.

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Accuracy of Interstitial Iron Measurements on P-Type Multicrystalline Silicon Blocks by Quasi-Steady-State Photoconductance

Goodarzi

Sinton²,

Jin

et al. 2017

IEEE J. Photovoltaics

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Silicon Ingot Quality and Resulting Solar Cell Performance

Cited by 6 publications

References 6 publications

Enhanced Device Performance of Bulk Heterojunction (BHJ) Hybrid Solar Cells Based on Colloidal CdSe Quantum Dots (QDs) via Optimized Hexanoic Acid-Assisted Washing Treatment

Enhanced Device Performance of Bulk Heterojunction (BHJ) Hybrid Solar Cells Based on Colloidal CdSe Quantum Dots (QDs) via Optimized Hexanoic Acid-Assisted Washing Treatment

Evaluation of impurities in the Brazilian solar grade silicon and LeTID investigations in p-type multi-Si

Accuracy of Interstitial Iron Measurements on P-Type Multicrystalline Silicon Blocks by Quasi-Steady-State Photoconductance

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