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Enhanced performances of InGaN/GaN-based blue light-emitting diode with InGaN/AIInGaN superlattice electron blocking layer 下载免费PDF全文
InGaN/AIlnGaN superlattice (SL) is designed as the electron blocking layer (EBL) of an InGaN/GaN-based light- emitting diode (LED). The energy band structure, polarization field at the last-GaN-barrier/EBL interface, carrier concen- tration, radiative recombination rate, electron leakage, internal quantum efficiency (IQE), current-voltage (l-V) perfor- mance curve, light output-current (L-l) characteristic, and spontaneous emission spectrum are systematically numerically investigated using APSYS simulation software. It is found that the fabricated LED with InGaN/AIInGaN SL EBL exhibits higher light output power, low forward voltage, and low current leakage compared with those of its counterparts. Meanwhile, the efficiency droop can be effectively mitigated. These improvements are mainly attributed to the higher hole injection efficiency and better electron confinement when InGaN/AIlnGaN SL EBL is used. 相似文献
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水质砷自动分析仪比对实验方法的探讨 总被引:1,自引:0,他引:1
探讨了砷自动分析仪与原子荧光法测定的实验方法,用水样相对误差绝对值的平均值(A值)和t检验两种方法对比对结果进行了判断。找出了9项环境保护行业标准之外的自动分析仪,在实际工作中比较切实可行的比对实验的方法。 相似文献
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Enhanced performance of InGaN/GaN multiple quantum well solar cells with double indium content 下载免费PDF全文
The performance of a multiple quantum well (MQW) InGaN solar cell with double indium content is investigated. It is found that the adoption of a double indium structure can effectively broaden the spectral response of the external quantum efficiencies and optimize the overall performance of the solar cell. Under AM1.5G illumination, the short-circuit current density (Jsc) and conversion efficiency of the solar cell are enhanced by 65% and 13% compared with those of a normal single-indium-content MQW solar cell. These improvements are mainly attributed to the expansion of the absorption spectrum and better extraction efficiency of the photon-generated carriers induced by higher polarization. 相似文献
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Droop improvement in blue InGaN light-emitting diodes with GaN/InGaN superlattice barriers 下载免费PDF全文
GaN/InGaN superlattice barriers are used in InGaN-based light-emitting diodes (LEDs). The electrostatic field in the quantum wells, electron hole wavefunction overlap, carrier concentration, spontaneous emission spectrum, light-current performance curve, and internal quantum efficiency are numerically investigated using the APSYS simulation software. It is found that the structure with GaN/InGaN superlattice barriers shows improved light output power, and lower current leakage and efficiency droop. According to our numerical simulation and analysis, these improvements in the electrical and optical characteristics are mainly attributed to the alleviation of the electrostatic field in the active region. 相似文献
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Enhanced performances of InGaN/GaN-based blue light-emitting diode with InGaN/AlInGaN superlattice electron blocking layer 下载免费PDF全文
InGaN/AlInGaN superlattice(SL) is designed as the electron blocking layer(EBL) of an InGaN/GaN-based lightemitting diode(LED). The energy band structure, polarization field at the last-GaN-barrier/EBL interface, carrier concentration, radiative recombination rate, electron leakage, internal quantum efficiency(IQE), current–voltage(I–V) performance curve, light output–current(L–I) characteristic, and spontaneous emission spectrum are systematically numerically investigated using APSYS simulation software. It is found that the fabricated LED with InGaN/AlInGaN SL EBL exhibits higher light output power, low forward voltage, and low current leakage compared with those of its counterparts.Meanwhile, the efficiency droop can be effectively mitigated. These improvements are mainly attributed to the higher hole injection efficiency and better electron confinement when InGaN/AlInGaN SL EBL is used. 相似文献