Fabrication of nanostructured heterojunction LEDs using self-forming moth eye type arrays of n-ZnO nanocones grown on p-si (111)substrates by pulsed laser deposition
Fabrication of nanostructured heterojunction LEDs using self-forming moth eye type arrays of n-ZnO nanocones grown on p-si (111)substrates by pulsed laser deposition
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使用通过脉冲激光沉积在 p-si (111) 基板上生长的自形成蛾眼型 n-ZnO 纳米锥阵列制造纳米结构异质结 LED
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
H. Drouhin
中科院分区：
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作者：
D. Rogers;V. Sandana;F. Hosseini Teherani;M. Razeghi;H. Drouhin
使用脉冲激光沉积在 Si (111) 基底上生长 ZnO 纳米结构。研究了生长温度（Ts）和氩气压力（PAr）对形貌、晶体结构和光致发光的影响。获得了各种类型的ZnO纳米结构。在较高的 Ts 下获得了具有强 c 轴晶体取向和良好光学响应的垂直排列纳米棒和纳米锥的自形成阵列。纳米锥或“蛾眼”型结构被选择用于 LED 开发，因为它们具有分级的有效折射率，有助于改善 LED/空气界面处的光提取。这种蛾眼阵列生长在 p 型 Si (111) 基板上，形成异质结 LED，其中 n 型 ZnO 纳米锥作为器件的有源组件。这些纳米结构 LED 具有整流 I/V 特性，阈值电压约为 6V，并且具有肉眼清晰可见的蓝白色电致发光特性。
ZnO nanostructures were grown on Si (111) substrates using: Pulsed Laser Deposition. The impact of growth temperature (Ts) and Ar pressure (PAr) on the morphology, crystal structure and photoluminescence was investigated. Various types of ZnO nanostructures were obtained. Self-forming arrays of vertically-aligned nanorods and nanocones with strong c-axis crystallographic orientation and good optical response were obtained at higher Ts. The nanocone, or "moth-eye", type structures were selected for LED development because of their graded effective refractive index, which could facilitate improved light extraction at the LED/air interface. Such moth-eye arrays were grown on p-type Si (111) substrates to form heterojunction LEDs with the n-type ZnO nanocones acting as an active component of the device. These nanostructured LEDs gave rectifying I/V characteristics with a threshold voltage of about 6V and a blueish-white electroluminescence, which was clearly visible to the naked eye.