Precise radiative lifetimes in bulk crystals from first principles: the case of wurtzite gallium nitride
Precise radiative lifetimes in bulk crystals from first principles: the case of wurtzite gallium nitride
复制标题
从第一原理得出块状晶体的精确辐射寿命:以纤锌矿氮化镓为例
DOI:
10.1088/1361-648x/ab5563
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Bernardi, Marco
中科院分区:
文献类型:
--
作者:
Jhalani, Vatsal A;Chen, Hsiao-Yi;Palummo, Maurizia;Bernardi, Marco
Gallium nitride (GaN) is a key semiconductor for solid-state lighting, but its radiative processes are not fully understood. Here we show a first-principles approach to accurately compute the radiative lifetimes in bulk uniaxial crystals, focusing on wurtzite GaN. Our computed radiative lifetimes are in very good agreement with experiment up to 100 K. We show that taking into account excitons (through the Bethe–Salpeter equation) and spin–orbit coupling is essential for computing accurate radiative lifetimes. A model for exciton dissociation into free carriers allows us to compute the radiative lifetimes up to room temperature. Our work enables precise radiative lifetime calculations in III-nitrides and other anisotropic solid-state emitters.
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