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Controllable Synthesis of Vertically Aligned p‐Type GaN Nanorod Arrays on n‐Type Si Substrates for Heterojunction Diodes
Author(s) -
Tang YongBing,
Bo XiangHui,
Lee ChunSing,
Cong HongTao,
Cheng HuiMing,
Chen ZhenHua,
Zhang WenJun,
Bello Igor,
Lee ShuitTong
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200800320
Subject(s) - nanorod , materials science , optoelectronics , heterojunction , diode , nanotechnology , ohmic contact , nanoparticle , doping , light emitting diode , layer (electronics)
A new catalyst seeding method is presented, in which aerosolized catalyst nanoparticles are continuously self‐assembled onto amine‐terminated silicon substrates in gas phase to realize controllable synthesis of vertically aligned Mg‐doped GaN nanorod arrays on n‐type Si (111) substrates. The diameter, areal density, and length of GaN nanorods can be controlled by adjusting the size of Au nanoparticles, flowing time of Au nanoparticles, and growth time, respectively. Based on the synthesis of p‐type GaN nanorods on n‐type Si substrates, p‐GaN nanorod/n‐Si heterojunction diodes are fabricated, which exhibit well‐defined rectifying behavior with a low turn‐on voltage of ∼1.0 V and a low leakage current even at a reverse bias up to 10 V. The controllable growth of GaN nanorod arrays and the realization of p‐type GaN nanorod/n‐type Si heterojunction diodes open up opportunities for low‐cost and high‐performance optoelectronic devices based on these nanostructured arrays.