The invention discloses a high-quality
gallium nitride crystal and a fluxing agent growth method and application thereof. The growth method comprises the steps that a first fluxing agent
system is adopted for primary growth to obtain an intermediate
crystal, a plurality of
gallium nitride nanowires are formed on the growth face of the intermediate
crystal to form a
nanowire template layer, and the first fluxing agent
system contains
metal nickel; a second fluxing agent
system is adopted,
secondary growth is carried out on the basis of the middle crystal, a combined growth layer which grows outwards in a combined mode from the
nanowire template layer is formed, and finally the high-quality
gallium nitride crystal is obtained. According to the method, the
crystal growth is realized by adopting a two-step fluxing agent method, the
gallium nitride nanowires are formed by utilizing the catalytic action of
metal nickel during the first growth, the
nanowire template layer formed by the
gallium nitride nanowires has the characteristics of compactness and uniformity, and the
gallium nitride crystal obtained by carrying out the
secondary growth based on the nanowire template layer is uniform in growth and high in yield. The
dislocation density of regrown gallium nitride is reduced more effectively, and the stress is reduced at the same time.