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  • AIP Publishing  (3)
  • Wang, C. D.  (3)
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  • AIP Publishing  (3)
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  • 1
    Online Resource
    Online Resource
    Simultaneous sudden changes of electrical behavior at the threshold in laser diodes
    AIP Publishing ; 2007
    In:  Journal of Applied Physics Vol. 102, No. 6 ( 2007-09-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 102, No. 6 ( 2007-09-15)
    Abstract: Precise ac electrical measurements as well as dc I-V plots at forward bias have been used to characterize multi-quantum-well (MQW) laser diodes. Step offsets of apparent conductance, apparent capacitance, junction voltage, series resistance, and ideality factor at lasing threshold were observed. To compare the electrical characteristics of different diodes numerical simulations of the IdV∕dI-I curve of the double-heterostructure (DH) laser were performed. We find that the conventional model used to explain this curve is not very satisfactory. Our simulations demonstrate that the junction voltage, series resistance, and ideality factor for both DH and MQW lasers exhibit the same sudden changes at threshold. Perhaps the electrical behavior near threshold for all laser diodes is very similar.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2779278
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
    Location Call Number Limitation Availability
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Deep saturation of junction voltage at large forward current of light-emitting diodes
    AIP Publishing ; 2007
    In:  Journal of Applied Physics Vol. 102, No. 9 ( 2007-11-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 102, No. 9 ( 2007-11-01)
    Abstract: The dependences of series resistance, ideality factor, and junction voltage of light-emitting diodes (LEDs) on applied voltage or current were characterized accurately using alternating current (ac) behavior combined with I-V plot (acIV method). The deep saturation of junction voltage and simultaneous decrease of ideality factor of LEDs at large forward current, which imply the pinning of quasi-Fermi levels, were observed. Comparing with our recent study of the similar phenomenon of laser diodes, in which the junction voltage jumps abruptly to a saturated value at lasing threshold, the changes of junction voltage of LEDs are gradual. In addition, the decrease of series resistance with the increasing current and the negative capacitance effect of LEDs were also investigated.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.2811869
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2007
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Elucidating negative capacitance in light-emitting diodes using an advanced semiconductor device theory
    AIP Publishing ; 2011
    In:  Journal of Applied Physics Vol. 109, No. 12 ( 2011-06-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 109, No. 12 ( 2011-06-15)
    Abstract: The capacitance characteristics of light emitting diodes (LEDs) are accurately measured using a method based on an alternating-current small signal, together with direct current I-V plot. All measured LEDs display negative capacitance (NC) at large forward bias. By analyzing the dependence of capacitance on both forward bias and frequency, an accurate expression for describing NC was obtained. This expression is in conflict with Shockley’s p-n junction theory, which only describes increasing diffusion capacitance and does not allow NC. Using an advanced p-n junction theory developed by Hess and Laux, the dependence of NC on both voltage and frequency are described quantitatively.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3597831
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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