In this work, we present a GaN-based blue LED construction utilizing bottom tunnel junction (TJ) grown by plasma-assisted molecular beam epitaxy. The setup allows for N-polar-like built-in field alignment while being grown on a Ga-polar substrate. In this study, we present an efficient bottom TJ LED in which the distance between the quantum well and device surface is only 25 nm. This is achieved by the utilization of an n-type current spreading layer consisting of 20 nm thick In0.02Ga0.98N with a Ge doping concentration of 7 × 1019 cm−3. Heavily Ge and Mg doped bottom TJs allowed achieving a low LED turn-on voltage of 2.75 V at 20 A/cm2 and a differential resistivity of 4.7 × 10−4 Ω cm2 at 1 kA/cm2. The device maintained high crystal quality and smooth morphology, which allows for its use as a light emitting platform for further integration. Although the p-up reference LED exhibits lower resistivity at high current, its luminous efficiency is lower than for bottom TJ LEDs.
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25 April 2022
Research Article|
April 25 2022
Bottom tunnel junction-based blue LED with a thin Ge-doped current spreading layer
Mikołaj Chlipała
;
Mikołaj Chlipała
a)
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
a)Author to whom correspondence should be addressed: chlipala@unipress.waw.pl
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Henryk Turski
;
Henryk Turski
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Mikołaj Żak
;
Mikołaj Żak
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Grzegorz Muziol
;
Grzegorz Muziol
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Marcin Siekacz
;
Marcin Siekacz
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Krzesimir Nowakowski-Szkudlarek
;
Krzesimir Nowakowski-Szkudlarek
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Natalia Fiuczek
;
Natalia Fiuczek
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Anna Feduniewicz-Żmuda
;
Anna Feduniewicz-Żmuda
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Julita Smalc-Koziorowska
;
Julita Smalc-Koziorowska
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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Czesław Skierbiszewski
Czesław Skierbiszewski
Institute of High Pressure Physics, Polish Academy of Sciences
, Sokołowska 29/37, PL-01-142 Warsaw, Poland
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a)Author to whom correspondence should be addressed: chlipala@unipress.waw.pl
Appl. Phys. Lett. 120, 171104 (2022)
Article history
Received:
December 14 2021
Accepted:
April 06 2022
Citation
Mikołaj Chlipała, Henryk Turski, Mikołaj Żak, Grzegorz Muziol, Marcin Siekacz, Krzesimir Nowakowski-Szkudlarek, Natalia Fiuczek, Anna Feduniewicz-Żmuda, Julita Smalc-Koziorowska, Czesław Skierbiszewski; Bottom tunnel junction-based blue LED with a thin Ge-doped current spreading layer. Appl. Phys. Lett. 25 April 2022; 120 (17): 171104. https://doi.org/10.1063/5.0082297
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