학술논문
Defects in GaAs solar cells with InAs quantum dots created by proton irradiation
Document Type
Conference
Author
Source
2015 IEEE 42nd Photovoltaic Specialist Conference (PVSC) Photovoltaic Specialist Conference (PVSC), 2015 IEEE 42nd. :1-5 Jun, 2015
Subject
Language
Abstract
GaAs pn-junction diodes with embedded InAs quantum dots (QDs) are irradiated with protons and the generated deep level traps are investigated using Deep Level Transient Spectroscopy (DLTS). The results are compared to GaAs pn-junction diodes without QDs in order to identify the origin of the deep level traps. The fluence dependence of trap density is investigated, and it is shown that majority carrier (electron) traps induced by irradiation increase in proportion to the fluence whereas the EL2 trap, which appears before irradiation, is not affected by irradiation. In addition, 0.14 eV minority carrier (hole) traps in the QD layer are found by using forward biased injection technique and it is shown that this unique trap is unaffected by irradiation. Electron and hole emission from QD levels are also discussed.