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Deprecated: Implicit conversion from float 235.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2020 ; 10 (1): 17433 Nephropedia Template TP
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Identifying the cause of thermal droop in GaInN-based LEDs by carrier- and thermo-dynamics analysis #MMPMID33060771
Han DP; Lee GW; Min S; Shin DS; Shim JI; Iwaya M; Takeuchi T; Kamiyama S; Akasaki I
Sci Rep 2020[Oct]; 10 (1): 17433 PMID33060771show ga
This study aims to elucidate the carrier dynamics behind thermal droop in GaInN-based blue light-emitting diodes (LEDs) by separating multiple physical factors. To this end, first, we study the differential carrier lifetimes (DCLs) by measuring the impedance of a sample LED under given driving-current conditions over a very wide operating temperature range of 300 K-500 K. The measured DCLs are decoupled into radiative carrier lifetime (tau(R)) and nonradiative carrier lifetime (tau(NR)), via utilization of the experimental DCL data, and then very carefully investigated as a function of driving current over a wide range of operating temperatures. Next, to understand the measurement results of temperature-dependent tau(R) and tau(NR) characteristics, thermodynamic analysis is conducted, which enables to look deeply into the temperature-dependent behavior of the carriers. On the basis of the results, we reveal that thermal droop is originated by the complex dynamics of multiple closely interrelated physical factors instead of a single physical factor. In particular, we discuss the inherent cause of accelerated thermal droop with elevated temperature.