"Suppressing non-radiative recombination in crown-shaped quantum wells", Gunwu Ju, Byung Hoon Na, Kwangwook Park, Hyeong-Yong Hwang, Young-Dahl Jho, NoSoung Myoung, Sang-Youp Yim, Hyung-jun Kim, Yong Tak Lee, Jpn. J. Appl. Phys. 57, 030305 (2018)
We examined the structural and optical properties of a crown-shaped quantum well (CSQW) to suppress nonradiative recombination. To reduce carrier loss in defect traps at the well/barrier interface, the CSQW was designed to concentrate carriers in the central region by tailoring the bandgap energy. Temperature-dependent photoluminescence measurements showed that the CSQW had a high activation energy and low potential fluctuation. In addition, the long carrier lifetime of the CSQW at high temperatures can be interpreted as indicating a decrease in carrier loss at defect traps.