One interesting issue with the solar cells processed with the UMG-Si substrate is the behavior as a function of
temperature. There are a number of publications presenting a study of the temperature coefficients of solar cells
respect to the substrate type (UMG-Si versus EG-Si) [2] or its resistivity [3]. These publications find that the CT
Pmpp of solar cells made from UMG-Si is lower than that of standard cells made from EG-Si, due notably to the
strong improvement of the photocurrent with increasing temperature. Furthermore, the temperature coefficients are
well anticorrelated to the solar cell resistivity.