URL: https://www.researchgate.net/publication/361148599/figure/fig9/AS:11431281107389986@1671046201269/Schematics-of-three-different-doping-schemes-a-QW-doping-b-barrier-doping-and-c.jpg
URL2: https://www.researchgate.net/figure/Schematics-of-three-different-doping-schemes-a-QW-doping-b-barrier-doping-and-c_fig9_361148599
