Radiative Recombination Dominated Monocrystalline CdTe/MgCdTe Double-Heterostructures

Yuan Zhao, Xin Hao Zhao, Yong-Hang Zhang

Research output: Contribution to journalArticle

Abstract

Monocrystalline CdTe/MgCdTe double-heterostruc-tures (DHs) grown on lattice-matched InSb substrates have achieved remarkable carrier-lifetimes up to 3.6 μs recently. In this paper, external luminescence quantum efficiencies ηext of CdTe/MgCdTe DHs are determined using photoluminescence quantum efficiency measurements. The external luminescence quantum efficiency of a 1-μm-thick CdTe/MgCdTe DH with indium-doped n-type at 1 × 1017 cm-3 is measured to be 3.0% under one-sun condition, i.e., a carrier injection current density of ∼30 mA/cm2, which corresponds to a spontaneous emission quantum efficiency ηq of 90 ± 4%. Such a high efficiency gives an implied open-circuit voltage Voc, or quasi-Fermi-level splitting of 1.13 V. The ηq of unintentionally doped DH samples with optimum barrier layers can be over 95% at one-sun injection level.

Original languageEnglish (US)
Article number7842549
Pages (from-to)690-694
Number of pages5
JournalIEEE Journal of Photovoltaics
Volume7
Issue number2
DOIs
StatePublished - Mar 1 2017
Externally publishedYes

Fingerprint

radiative recombination
Quantum efficiency
Heterojunctions
quantum efficiency
Sun
Luminescence
sun
luminescence
Indium
Carrier lifetime
carrier injection
Spontaneous emission
Open circuit voltage
barrier layers
carrier lifetime
Fermi level
open circuit voltage
spontaneous emission
indium
Photoluminescence

Keywords

  • cadmium compounds
  • II-VI semiconductor materials
  • photoluminescence
  • photovoltaic (PV) cells
  • thin films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Radiative Recombination Dominated Monocrystalline CdTe/MgCdTe Double-Heterostructures. / Zhao, Yuan; Zhao, Xin Hao; Zhang, Yong-Hang.

In: IEEE Journal of Photovoltaics, Vol. 7, No. 2, 7842549, 01.03.2017, p. 690-694.

Research output: Contribution to journalArticle

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