UV photooxidation induced structural and photoluminescence behaviors in vapor-etching based porous silicon

“…Indeed, ageing in ambient air replaces unstable SiHx bonds by stable ones leading to a degradation of the cell characteristics [15]. However, it was demonstrated that the SiHx to SiOx transition occurs via (OySiHx) intermediate states, which are suspected to cause degradation [21].…”

Section: Contributed Articlementioning

confidence: 99%

Porous silicon‐based microtexturing of textured monocrystalline silicon solar cells

Saadoun

Boujmil

Aouida

et al. 2010

Phys. Status Solidi C

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This work aims to examine the effects of surface micro‐texturing on the performances of pyramidal textured monocrystalline silicon (c‐Si) photovoltaic solar cells. The surface micro‐textures were performed on the emitter of alkaline‐textured PV solar cells without damaging the junction, using the HNO3/HF vapor etching (VE) method. Scanning Electron Microscopy (SEM) shows that vapour etched pyramidal textures exhibit a high texture density essentially composed of porous silicon (PS) microstructure. The VE technique notably decreases the surface reflectivity from 12% for alkaline‐textured c‐Si wafers to about 6% after micro‐texturing. Subsequent to VE, the sheet resistance was found to increase indicating a reduction of the dead layer. Fourier Transform Infrared Spectroscopy (FTIR) measurements showed that the PS‐based micro‐textures are hydrogen‐rich, which could have passivation capabilities of the emitter. Taking into account basic phenomena occurring during carrier photogeneration and minority carrier collection, we tried explaining the variation of the short circuit current density (Jsc), the open circuit voltage (Voc) and the Fill factor (FF) due to PS‐microtexturing of the emitter of c‐Si solar cells (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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“…The band centred at 1080 cm -1 corresponding to the Si-O stretching vibration mode widens. The shoulder in the 1100-1250 cm -1 region, corresponds to the out-of-phase Si-O stretching vibration mode [14][15][16][17]. Compared with the (ox-Si) spectrum, the Si-O x related vibration bands are largely strengthened in the (ox-PS) spectra.…”

Section: Rapid Thermal Oxidation Of Porous Siliconmentioning

confidence: 99%

Porous silicon used as an oxide diffusion mask to produce a periodic micro doped n⁺⁺/n regions

Dimassi

Jafel

Lajnef

et al. 2010

Phys. Status Solidi C

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The realization of screen‐printed contacts on silicon solar cells requires highly doped regions under the fingers and lowly doped and thin ones between them. In this work, we present a low‐cost approach to fabricate selective emitter (n++/n doped silicon regions), using oxidized porous silicon (ox‐PS) as a mask. Micro‐periodic fingers were opened on the porous silicon layer using a micro groove machining process. Optimized phosphorous diffusion through the micro grooved ox‐PS let us obtain n++ doped regions in opened zones and n doped large regions underneath the ox‐PS layer. The dark I‐V characteristics of the obtained device and Fourier transform infrared (FTIR) spectroscopy investigations of the PS layer show the possibility to use PS as a dielectric layer. The Light Beam Induced Current (LBIC) mapping of the realized device, confirm the presence of a micro periodic n++/n type structure. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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UV photooxidation induced structural and photoluminescence behaviors in vapor-etching based porous silicon

Cited by 18 publications

References 16 publications

Progress of porous silicon APTES-functionalization by FTIR investigations

Progress of porous silicon APTES-functionalization by FTIR investigations

Porous silicon‐based microtexturing of textured monocrystalline silicon solar cells

Porous silicon used as an oxide diffusion mask to produce a periodic micro doped n⁺⁺/n regions

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UV photooxidation induced structural and photoluminescence behaviors in vapor-etching based porous silicon

Cited by 18 publications

References 16 publications

Progress of porous silicon APTES-functionalization by FTIR investigations

Progress of porous silicon APTES-functionalization by FTIR investigations

Porous silicon‐based microtexturing of textured monocrystalline silicon solar cells

Porous silicon used as an oxide diffusion mask to produce a periodic micro doped n++/n regions

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Product

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Porous silicon used as an oxide diffusion mask to produce a periodic micro doped n⁺⁺/n regions