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Title: Superlinear generation of exciton and related paramagnetism induced by forward current in a diamond p-i-n junction

The concentration of excitons generated in a high-quality diamond p-i-n junction is investigated considering the forward current characteristics of the junction. As the forward current in the junction increases, the exciton concentration increases superlinearly, contrary to the linear increases of the electron and hole concentration. This tendency suggests a superlinear increase in emission intensity due to exciton recombination. The increase rate is more radical than quadratic, in accordance with the observed increase of the integrated intensity of free exciton emission. To estimate the concentration of triplet excitons generated in the p-i-n junction, observation of the paramagnetism due to the exciton spin moment is proposed. The magnetic susceptibility superlinearly increases with the increase in the forward current, unlike any other magnetic property of the device.
Authors:
 [1]
  1. Frontier Research Center, Tokyo Institute of Technology, Yokohama 226-8502 (Japan)
Publication Date:
OSTI Identifier:
22413058
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CONCENTRATION RATIO; DIAMONDS; ELECTRIC CONTACTS; ELECTRIC CURRENTS; ELECTRONS; EXCITONS; HOLES; MAGNETIC SUSCEPTIBILITY; PARAMAGNETISM; RECOMBINATION; SEMICONDUCTOR JUNCTIONS; SPIN; TRIPLETS