Papers by Keyword: Localized Heating

Abstract: The aim of this study was to investigate the localized solar cells heating by thermal imaging, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The electrical measurements and thermal infrared measurements were done on the commercial crystalline Si cells (10 cm x 10 cm). SEM was used for the observation of the localized heating. The I-V characteristics of all cells were quite similar with a small spread in the electrical parameters, while the IR images were different: some cells had quite uniform temperature profiles distribution and other ones showed the localized heating. The energy dispersive spectroscopy (EDS) analysis showed that some hot spots have high metal impurity contamination. The micro-structure investigation of hot spots revealed the micro-cracks presence. Our study found direct correlation between areas of high impurity contamination, micro cracks and hot-spot heating.

Abstract: Since introducing Rapid Thermal Annealing, there has been disagreement among experimental data of ion-implanted and annealed layers. One explanation of these differences is the impact of optical irradiation and its interaction with semiconductor material. Although no plausible explanation has been offered, experimental evidence of “photonic effects” was reported in many works. In this work we estimate energy per atom available during recombination of the excited carriers. It is argued that the localization of energy states inside the band gap in ion-implant damaged material is responsible for “photonic effects.”