45-GHz bandwidth-efficiency resonant-cavity-enhanced ITO-Schottkyphotodiodes |
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| Authors: | Biyikli N Kimukin I Aytur O Gokkavas M Selim Unlu M Ozbay E |
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| Affiliation: | Dept. of Electr. Eng., Bilkent Univ., Ankara; |
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| Abstract: | High-speed Schottky photodiodes suffer from low efficiency mainly due to the thin absorption layers and the semitransparent Schottky-contact metals. We have designed, fabricated and characterized high-speed and high-efficiency AlGaAs-GaAs-based Schottky photodiodes using transparent indium-tin-oxide Schottky contact material and resonant cavity enhanced detector structure. The measured devices displayed resonance peaks around 820 nm with 75% maximum peak efficiency and an experimental setup limited temporal response of 11 ps pulsewidth. The resulting 45-GHz bandwidth-efficiency product obtained from these devices corresponds to the best performance reported to date for vertically illuminated Schottky photodiodes |
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