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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Solar Cell Silicon
Presentation Title K-18: Leaching of Indium from ITO Present in Amorphous Silicon Photovoltaic Modules
Author(s) Pedro Forastieri de Almeida Prado, Jorge Alberto Soares Tenório, Denise Crocce Romano Espinosa
On-Site Speaker (Planned) Jorge Alberto Soares Tenório
Abstract Scope There is an increasing challenge of waste management regarding the growth of photovoltaic (PV) technology. Often overlooked by its environmental benefits of greenhouse gas emission reduction, PV technology contain metals that are highly hazardous for the environment. Amorphous silicon (a-Si) PV modules employ indium-tin-oxide as transparent conductive oxide and given the high price of indium its recovery could be advantageous from an economic perspective as well. Leaching of indium was predicted by comparing the Pourbaix diagram with the values of oxidoreduction potential and pH measured on a phosphoric acid solution. The a-Si panel was subjected to thermal treatment to remove the proprietary, protective coating and allow leaching to occur. Then, indium could be leached by phosphoric acid in a jacketed reactor, reaching a concentration of 55 ppm (67% leaching rate) with a 0.2 g/mL of a-Si panel to aqueous solution ratio. The leaching of indium with phosphoric acid is novel and could open doors for many other recycling routes for solar panels.
Proceedings Inclusion? Planned:


Boron Removal from Ferrosilicon Alloy via Slag Treatment
Crystal Growth Mechanism of Si in Hypereutectic Al-Si Melt during the Electromagnetic Directional Solidification
Enhancement of Efficiency in Nanostructured-Si Solar Cells by Employing Doped-graphene Transparent Conductive Electrodes
Influence of Chemical and Heat Treatment on the Properties of Disi Raw Sandstones in Jordan
K-17: High Temperature Pressure Filtration Applying for Separation of Silicon and Liquation Agent
K-18: Leaching of Indium from ITO Present in Amorphous Silicon Photovoltaic Modules
K-19: The Effect of Rapid Heat Treatment on Crystal Defect Evolution and Electrical Properties of the Original High Efficient Polycrystalline Silicon
Removal Impurities from Metallurgical Silicon by Slag Treatment Combined with Acid Leaching
Review of Solar Silicon Recycling
Solar Silicon by Direct Carbothermic Reduction - Review and Outlook
Structure Nature of Boron Removal from Silicon in Slagging Refining: A Raman Spectroscopy and NMR Spectroscopy Study
The Mechanism of Boron Removal from Silicon Alloy by Electric Field Using Slag Treatment
Thermo-Calc of the Phase Diagram of Calcium Silicon (Ca-Si) System
Thermo-Calc of the Phase Diagram of the Fe-Si System
Three-dimensional Crystal-plasticity based Model for Intrinsic Stresses in Multi-junction Photovoltaic

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