Université de Neuchâtel

Monitoring a-Si:H solar cells degradation by two sides blue lightcollection

Masini, G. ; Fischer, Diego ; Hubin, J. ; Palma, F. ; Shah, Arvind

In: Conference Record of the Twenty Fourth IEEE Photovoltaic Specialists Conference (1994 IEEE First World Conference on Photovoltaic Energy Conversion), 1994, vol. 1, p. 610-613

In view of the persistent lack of correlation between single layer material properties and solar cell performance, one is at present interested in experimental techniques which allow the characterisation of material properties within a full p-i-n cell. In this paper, the authors introduce a novel method to monitor i-layer properties during degradation of a-Si:H p-i-n solar cell. Two blue,...

Université de Neuchâtel

Micromorph Solar Cell Optimization using a ZnO Layer as Intermediate Reflector

Dominé, Didier ; Bailat, Julien ; Steinhauser, Jérôme ; Shah, Arvind ; Ballif, Christophe

In: Conference Record of the 2006 IEEE 4th World Conference on Photovoltaic Energy Conversion, 2006, vol. 2, p. 1465-1468

The insertion of a zinc oxide (ZnO) intermediate reflector (ZIR) between the top and bottom cell of a superstrate (p-i-n/p-i-n) micromorph tandem solar cell is analyzed, experimentally and by numerical simulation. Solar cells are deposited onto glass plates coated by surface-textured ZnO layers deposited by low-pressure chemical vapour deposition (LP-CVD). The gain in the top cell short-circuit...

Université de Neuchâtel

a-Si:H/a-Si:H stacked cell from VHF-deposition in a single chamber reactor with 9% stabilized efficiency

Platz, R. ; Fischer, Diego ; Dubail, S. ; Shah, Arvind

In: Solar Energy Materials and Solar Cells, 1997, vol. 46, no. 2, p. 157-172

In the present paper we present results on a-Si:H/a-Si:H stacked cells deposited in a single-chamber reactor by the very high frequency-glow discharge (VHF-GD) deposition technique at 70 MHz. Hydrogen dilution of the i-layer yields more stable amorphous p−i−n solar cells, similar to what is observed for RF deposition. High dilution ratios of the i-layer are found to enhance contaminations....

Université de Neuchâtel

Simulation of the growth dynamics of amorphous and microcrystalline silicon

Bailat, Julien ; Vallat-Sauvain, Evelyne ; Vallat, A. ; Shah, Arvind

In: Journal of Non-Crystalline Solids, 2004, vol. 338-340, p. 32-36

The qualitative description of the major microstructure characteristics of microcrystalline silicon is achieved through a three-dimensional discrete dynamical growth model. The model is based on three fundamental processes that determine surface morphology: (1) random deposition of particles, (2) local relaxation and (3) desorption. In this model, the incoming particle reaching the growing...

Université de Neuchâtel

Microcrystalline/micromorph silicon thin-film solar cells prepared by VHF-GD technique

Meier, Johannes ; Vallat-Sauvain, Evelyne ; Dubail, S. ; Kroll, U. ; Dubail, J. ; Golay, S. ; Feitknecht, Luc ; Torres, Pedro ; Faÿ, Sylvie ; Fischer, D. ; Shah, Arvind

In: Solar Energy Materials and Solar Cells, 2001, vol. 66, no. 1-4, p. 73-84

Hydrogenated microcrystalline silicon prepared at low temperatures by the glow discharge technique is examined here with respect to its role as a new thin-film photovoltaic absorber material. XRD and TEM characterisations reveal that microcrystalline silicon is a semiconductor with a very complex morphology. Microcrystalline p–i–n cells with open-circuit voltages of up to 560–580 mV could...