Evidence map›Paper›PMID 36820322›Full record

ArticleACS photonics2023

Increased Light Extraction of Thin-Film Flip-Chip UVB LEDs by Surface Texturing.

Michael A Bergmann, Johannes Enslin, Martin Guttmann, Luca Sulmoni, Neysha Lobo Ploch, Filip Hjort, Tim Kolbe, Tim Wernicke, Michael Kneissl, Åsa Haglund

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in ACS photonics, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.

0numbers the graph read from it
0cells of the map it votes in
2citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

2 citing papers in PubMed.

  1. Review
  2. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors.

Michael A BergmannChalmers University of Technology, Department of Microtechnology and Nanoscience, 41296Gothenburg, Sweden.ORCID https://orcid.org/0000-0001-6885-799X
Johannes EnslinTechnische Universität Berlin, Institute of Solid State Physics, 10623Berlin, Germany.
Martin GuttmannTechnische Universität Berlin, Institute of Solid State Physics, 10623Berlin, Germany.ORCID https://orcid.org/0000-0002-4697-3145
Luca SulmoniTechnische Universität Berlin, Institute of Solid State Physics, 10623Berlin, Germany.ORCID https://orcid.org/0000-0002-5341-7032
Neysha Lobo PlochFerdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, 12489Berlin, Germany.
Filip HjortChalmers University of Technology, Department of Microtechnology and Nanoscience, 41296Gothenburg, Sweden.
Tim KolbeFerdinand-Braun-Institut gGmbH, Leibniz-Institut für Höchstfrequenztechnik, 12489Berlin, Germany.
Tim WernickeTechnische Universität Berlin, Institute of Solid State Physics, 10623Berlin, Germany.
Michael KneisslTechnische Universität Berlin, Institute of Solid State Physics, 10623Berlin, Germany.
Åsa HaglundChalmers University of Technology, Department of Microtechnology and Nanoscience, 41296Gothenburg, Sweden.ORCID https://orcid.org/0000-0001-6453-7120

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Ultraviolet light-emitting diodes (LEDs) suffer from a low wall-plug efficiency, which is to a large extent limited by the poor light extraction efficiency (LEE). A thin-film flip-chip (TFFC) design with a roughened N-polar AlGaN surface can substantially improve this. We here demonstrate an enabling technology to realize TFFC LEDs emitting in the UVB range (280-320 nm), which includes standard LED processing in combination with electrochemical etching to remove the substrate. The integration of the electrochemical etching is achieved by epitaxial sacrificial and etch block layers in combination with encapsulation of the LED. The LEE was enhanced by around 25% when the N-polar AlGaN side of the TFFC LEDs was chemically roughened, reaching an external quantum efficiency of 2.25%. By further optimizing the surface structure, our ray-tracing simulations predict a higher LEE from the TFFC LEDs than flip-chip LEDs and a resulting higher wall-plug efficiency.

Identifiers

PMID36820322
PMCPMC9936579

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.