操作在零直流偏壓和次兆赫波頻段下並具有集極漸變帶溝的高性能銻砷化鎵/磷化銦單載子光偵測器;High-Performance GaAs0.5Sb0.5/InP UTC-PD with Graded-Bandgap Collector for Zero-Bias Operation at Sub-THz Regime

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题名:	操作在零直流偏壓和次兆赫波頻段下並具有集極漸變帶溝的高性能銻砷化鎵/磷化銦單載子光偵測器;High-Performance GaAs0.5Sb0.5/InP UTC-PD with Graded-Bandgap Collector for Zero-Bias Operation at Sub-THz Regime
作者:	曾郁崙;Zeng,Yu-lon
贡献者:	電機工程學系
关键词:	零偏壓單載子光偵測器;zero bias UTC-PD
日期:	2015-12-08
上传时间:	2016-01-05 19:09:28 (UTC+8)
出版者:	國立中央大學
摘要:	高速高功率光偵測器在毫米波光纖和太赫茲無線通訊系統扮演重要角色，為了將元件速度推進到太赫茲頻段，必須減少空乏層厚度和主動區面積，使其縮短內部載子的傳輸時間和RC造成的頻寬限制，達成高頻目標。然而，減少元件的結構大小常會使其在高功率操作下造成嚴重的熱毀壞效應。元件最主要的發熱來源為輸入电功率，為DC反向偏壓和光電流的乘積所造成，所以讓光偵測器在零偏壓操作下還可以保持高速高功率的表現是解決熱效應的最佳方法。單載子傳輸光偵測器能在微小的額外電場下(~10KV/cm)以快速的电子當做主要傳輸載子，此結構設計可有效幫助元件在零偏壓下，還可達到上述所提到的目標。單載子光偵測器已被證實在1.2mA下擁有卓越的3dB頻寬(>110GHz)且在100GHz和2mA下擁有良好的輸出飽合功率(-18.6dBm)。在這次實驗中，我們證實了透過創新的磊晶結構設計可以大幅增加元件在零偏壓下的特性表現，藉由使用type II吸收層/收集層(GaAs0.5Sb0.5/InP)接面和在收集層中使用AlxInyGa1-x-yAs漸變能帶，即可使電流阻斷效應降低。最好的高速表現(2mA下3db頻寬可達到~140GHz)和160GHz操作頻率下的高輸出功率(8mA下可達到-13.9dBm)已經被成功證實。 ;High-speed and high-power photodiodes (PDs) serve as the key component in the millimeter-wave-over-fiber (MoF) or THz wireless communication system. In order to boost the speed of PD up to THz regime, downscaling the depletion layer thickness and device active area is an essential way to minimize both the internal carrier transient time and RC-limited bandwidth. However, the miniaturized size of device usually results in serious device-heating and thermal failure under high-power operation. The primary source of self-heating is the input electrical power, which equals to the product of dc reverse bias of PD and its output photocurrent. To have the PD sustain high-speed and high-power performance even under zero-bias operation should thus be one of effective solutions to minimize this thermal issue. Uni-traveling carrier photodiodes (UTC-PDs), which have only fast electron as active carriers under small external applied electric field (~ 10 kV/cm), is one of attractive choices to meet the above-mentioned application under zero-bias operation. Such device structure has demonstrated an excellent 3-dB O-E bandwidth (>110 GHz) under 1.2 mA output photocurrent with a moderate saturation output power (-18.6 dBm at 2mA) at 100 GHz. In this work, we demonstrate a novel design of UTC-PD, which can further enhance its zero-bias performance. By using type-II (GaAs0.5Sb0.5/InP) absorption/collector interface and AlxInyGa1-x-yAs graded bandgap structure in the collector layer, the current blocking (Kirk) effect can be minimized. State-of-the-art high-speed performance (~140 GHz 3-dB O-E bandwidth at 2mA output photocurrent) and output power (-13.9 dBm at 8 mA) at sub-THz regime (160 GHz) under zero-bias operation has been successfully demonstrated.
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