1. Laboratory of Micro- and Photo Electronics, LAMI-ETRO, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussels 1050, Belgium; School of Electrical and Computer Engineering (FEEC), University of Campinas (UNICAMP), Cidade Universitária, 13083-852 Campinas, SP, Brazil; and Center for Semiconductor Components and Nanotechnologies (CCSNano), University of Campinas (UNICAMP), Cidade Universitária, 13083-870 Campinas, SP, Brazil
2. Laboratory of Micro- and Photo Electronics, LAMI-ETRO, Vrije Universiteit Brussel (VUB), Pleinlaan 2, Brussels 1050, Belgium