2010
DOI: 10.3390/s101210571
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Near-Infrared Sub-Bandgap All-Silicon Photodetectors: State of the Art and Perspectives

Abstract: Due to recent breakthroughs, silicon photonics is now the most active discipline within the field of integrated optics and, at the same time, a present reality with commercial products available on the market. Silicon photodiodes are excellent detectors at visible wavelengths, but the development of high-performance photodetectors on silicon CMOS platforms at wavelengths of interest for telecommunications has remained an imperative but unaccomplished task so far. In recent years, however, a number of near-infr… Show more

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Cited by 168 publications
(85 citation statements)
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“…Under these conditions, this represents a significant performance improvement compared to prior reports in hotelectron photodetection, 27,28,53 making this platform a viable alternative for other well-established technologies for subbandgap photodetection that are based on internal photoemission, such as metal silicides (Supporting Information section S10). 54 The variation of parameters such as the refractive index of the different PC constituent materials can potentially give access to other spectral regions, such as short-and midwavelength infrared, as an alternative to toxic HgCdTebased photodetection 55 or even to long-wave infrared and THz. 56 Other areas such as photovoltaics or photocatalysis 31 can benefit from this architecture because it bridges the gap between large area, infrared sensitization, and high performance.…”
Section: ■ Resultsmentioning
confidence: 99%
“…Under these conditions, this represents a significant performance improvement compared to prior reports in hotelectron photodetection, 27,28,53 making this platform a viable alternative for other well-established technologies for subbandgap photodetection that are based on internal photoemission, such as metal silicides (Supporting Information section S10). 54 The variation of parameters such as the refractive index of the different PC constituent materials can potentially give access to other spectral regions, such as short-and midwavelength infrared, as an alternative to toxic HgCdTebased photodetection 55 or even to long-wave infrared and THz. 56 Other areas such as photovoltaics or photocatalysis 31 can benefit from this architecture because it bridges the gap between large area, infrared sensitization, and high performance.…”
Section: ■ Resultsmentioning
confidence: 99%
“…Measurable photoconductivity at energies well below the band gap for the Si reference sample would be produced by transitions involving surface states. 33,34 This feature was expected since the substrates used have high purity and therefore a high carrier lifetime that could be reducing bulk recombination. Transitions involving impurities that produce mid-gap defects are highly unlikely for the same reason.…”
Section: à3mentioning
confidence: 99%
“…In the last years, in order to take advantage of low-cost standard Si-CMOS processing technology, a number of photodetectors have been proposed based on different physical effects, such as: defect-state absorption (Bradley et al, 2005), two photon absorption (TPA) (Liang et al, 2002) and internal photoemission absorption (Zhu et al, 2008a). Physical effects, working principles, main structures reported in literature and the most significant results obtained in recent years were reviewed and discussed in our previous paper (Casalino et al, 2010a). In this paragraph, we go into more depth on photodetectors based on the internal photoemission effect (IPE).…”
Section: Introductionmentioning
confidence: 99%