Simultaneous positive and negative photocurrent response in asymmetric quantum dot infrared photodetectors

D. Alvarenga, C. A. Parra-Murillo, G. M. Penello, R. Kawabata, W. N. Rodrigues, D. R. Miquita, W. Schmidt, P. S. S. Guimaraes, M. P. Pires, K. Unterrainer, and P. L. Souza

J. Appl. Phys. 113, 043721 (2013)