Influences of screw dislocations on electroluminescence of AlGaN/AlN-based UVC LEDs | Zendy

Dong Liu | Zendy; Sang June Cho | Zendy; Huilong Zhang | Zendy; Corey Carlos | Zendy; Akhil Kalapala | Zendy; Jeongpil Park | Zendy; Jisoo Kim | Zendy; Rafael Dalmau | Zendy; Jiarui Gong | Zendy; Baxter Moody | Zendy; Xudong Wang | Zendy; John D. Albrecht | Zendy; Weidong Zhou | Zendy; Zhenqiang Ma | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

Influences of screw dislocations on electroluminescence of AlGaN/AlN-based UVC LEDs

Author(s) -

Dong Liu,

Sang June Cho,

Huilong Zhang,

Corey Carlos,

Akhil Kalapala,

Jeongpil Park,

Jisoo Kim,

Rafael Dalmau,

Jiarui Gong,

Baxter Moody,

Xudong Wang,

John D. Albrecht,

Weidong Zhou,

Zhenqiang Ma

Publication year - 2019

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5108743

Subject(s) - materials science , electroluminescence , light emitting diode , hillock , optoelectronics , photoluminescence , dislocation , wavelength , diode , ultraviolet , nanotechnology , composite material , layer (electronics)

We investigated two types of threading dislocations in high Al-composition Al0.55Ga0.45N/AlN multiple quantum well (MQW) structures grown on AlN substrate for electrically injected deep ultraviolet light-emitting diodes (LEDs). The surface morphology and defects electrical characteristics of the MQW LED structures were examined via conductive atomic force microscopy (CAFM). We found that the disparity between photoluminescence (PL) and electroluminescence (EL) spectra in terms of light emission output and wavelength shift are attributed to the existence of the surface hillocks, especially to the ones that have open-core dislocations. The open-core dislocations form current leakage paths through their defect states and the composition inhomogeneity (i.e., Ga rich) at the dislocation sites are responsible for the light emission at longer wavelengths.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research