Specific Process Knowledge/Etch/III-V ICP/InP-InGaAsP-InGaAs: Difference between revisions
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== InP etch with Cl2/H2 and a Si carrier wafer (2019) == | == InP etch with Cl2/H2 and a Si carrier wafer (2019) == | ||
''Work done by Berit Herstrøm @Nanolab spring 2019'' | ''Work done by Berit Herstrøm @Nanolab spring 2019'' | ||
*Sidewall passivation assisted by a silicon coverplate during and HBr | <br> | ||
inductively coupled plasma etching of InP for photonic devices | This work was done with great inspiration from the following articles: | ||
S. Bouchoule, G. Patriarche, S. Guilet, L. Gatilova, L. Largeau, and P. Chabert | *'''Sidewall passivation assisted by a silicon coverplate during and HBr inductively coupled plasma etching of InP for photonic devices''' ''by S. Bouchoule, G. Patriarche, S. Guilet, L. Gatilova, L. Largeau, and P. Chabert'', Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena 26, 666 (2008); doi: 10.1116/1.2898455 | ||
Measurement, and Phenomena 26, 666 (2008); doi: 10.1116/1. | *'''Optimization of a inductively coupled plasma etching process adapted to nonthermalized InP wafers for the realization of deep ridge heterostructures''', ''by S. Guilet, S. Bouchoule, C. Jany, C. S. Corr, and P. Chabert'', Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena 24, 2381 (2006); doi: 10.1116/1.2348728 | ||
*'''Investigation of InP etching mechanisms in a inductively coupled plasma by optical emission spectroscopy''', ''by L. Gatilova, S. Bouchoule, S. Guilet, and P. Chabert'', Journal of Vacuum Science & Technology A 27, 262 (2009); doi: 10.1116/1.3071950 | |||
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Image:S0_oxide_05.jpg|Sample S0: Top view of the oxide mask before etching. It is the TRAVKA50 mask, but it is clear that the CD reduction is about the 1-1.5 µm of the lines. | Image:S0_oxide_05.jpg|Sample S0: Top view of the oxide mask before etching. It is the TRAVKA50 mask, but it is clear that the CD reduction is about the 1-1.5 µm of the lines. | ||
Image:S4_06.jpg|Sample S4: Profile view. The recipe InP etch has been used. <br> The sample has been run on a SiO2 carrier wafer. <br> There is not much CD change compared to the oxide mask before the etch. <br> It seems like the SiO2 mask is gone and the sidewall angle from the mask has been transferred into the sample. <br> The sidewall profile is quit vertical in the lower part. <br> Etch time 15 min <br> Etch depth in large open areas: 9.19µm | Image:S4_06.jpg|Sample S4: Profile view. The recipe InP etch has been used. <br> The sample has been run on a SiO2 carrier wafer. <br> There is not much CD change compared to the oxide mask before the etch. <br> It seems like the SiO2 mask is gone and the sidewall angle from the mask has been transferred into the sample. <br> The sidewall profile is quit vertical in the lower part. <br> Etch time 15 min <br> Etch depth in large open areas: 9.19µm | ||
Image:S5_05.jpg|Sample S5: Profile view. The recipe InP etch has been used but with modified Cl2 and N2 flows: N2=30 sccm Cl2=30 sccm. <br> The sample has been run on a SiO2 carrier wafer. <br> There is not much CD change compared to the oxide mask before the etch. <br> It seems like the SiO2 mask is gone. <br> The sidewall profile is overcutting probably due to too little passivation. <br> Etch time 10 min <br> Etch depth in large open areas: 11.82µm | Image:S5_05.jpg|Sample S5: Profile view. The recipe InP etch has been used but with modified Cl2 and N2 flows: N2=30 sccm Cl2=30 sccm. <br> The sample has been run on a SiO2 carrier wafer. <br> There is not much CD change compared to the oxide mask before the etch. <br> It seems like the SiO2 mask is gone. <br> The sidewall profile is overcutting probably due to too little passivation. <br> Etch time 10 min <br> Etch depth in large open areas: 11.82µm | ||