Publications de Andrea Feltrin

Publications associées (23)

Research and developments in thin film silicon photovoltaics

Christophe Ballif, Franz-Josef Haug, Matthieu Despeisse, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon, Sylvie Faÿ

The increasing demand for photovoltaic devices and the associated crystalline silicon feedstock demand scenario have led in the past years to the fast growth of the thin film silicon industry. The high potential for cost reduction and the suitability for b ...

2009

Laser applications in thin-film photovoltaics

Christophe Ballif, Andrea Feltrin, Benjamin Strahm

We review laser applications in thin-film photovoltaics (thin-film Si, CdTe, and Cu(In,Ga)Se2 solar cells). Lasers are applied in this growing field to manufacture modules, to monitor Si deposition processes, and to characterize opto-electrical properties ...

Springer Verlag2009

Near-field spectroscopy and theoretical modeling of disordered semiconductor quantum wires

Andrea Feltrin

In this thesis work, we report scanning near-field optical photoluminescence spectroscopy measurements with at best 200 nm spatial resolution performed on disordered semiconductor V-groove AlGaAs/GaAs quantum wires. In order to interpret the results of the ...

EPFL2004

High-rate deposition of microcrystalline silicon in a large-area PECVD reactor and integration in tandem solar cells

Christophe Ballif, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon

We study the high-rate deposition of microcrystalline silicon in a large-area plasma-enhanced chemical-vapor-deposition (PECVD) reactor operated at 40.68 MHz, in the little-explored process conditions of high-pressure and high-silane concentration and depl ...

2010

Optical emission spectroscopy to diagnose powder formation in SiH4-H2 discharges

Christophe Ballif, Andrea Feltrin, Benjamin Strahm

Silane and hydrogen discharges are widely used for the deposition of silicon thin film solar cells in large area plasmaenhanced chemical vapor deposition reactors. In the case of microcrystalline silicon thin film solar cells, it is of crucial importance t ...

2009

Silane depletion dependent ion bombardment and material quality of microcrystalline silicon deposited by VHF-PECVD

Christophe Ballif, Andrea Feltrin, Grégory Bugnon

Microcrystalline silicon is a composite material embedding silicon nanocrystals in an amorphous matrix [1]. It has attracted much research efforts in the photovoltaic domain [2], because of its potential for integration in a tandem cell concept as bottom c ...

2009

ZnO Transparent conductive oxide for thin film silicon solar cells

Christophe Ballif, Franz-Josef Haug, Sylvain Nicolay, Matthieu Despeisse, Mathieu Gérard Boccard, Andrea Feltrin, Grégory Bugnon, Sylvie Faÿ, Peter Cuony

There is general agreement that the future production of electric energy has to be renewable and sustainable in the long term. Photovoltaic (PV) is booming with more than 7GW produced in 2008 and will therefore play an important role in the future electric ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2010

Plasma Modelling and Diagnostics for the Prediction of Structural Changes in Silicon Thin Film Deposition Plasma Modelling and Diagnostics for the Prediction of Structural Changes in Silicon Thin Film Deposition

Christophe Ballif, Andrea Feltrin, Grégory Bugnon

In the present work, we apply a 2D self consistent model of SiH4/H2 discharges in order to investigate the transition from microcrystalline to amorphous silicon growth. The model is used to examine the relative importance of ions and atomic hydrogen in the ...

2008

Low power high growth rate deposition of microcrystalline silicon

Christophe Ballif, Andrea Feltrin, Grégory Bugnon

Microcrystalline growth regimes and solar cells obtained in different pressure and silane depletion conditions are studied in a large area KAI-S plasma reactor. The microcrystalline material quality is systematically investigated by Fourier Transform Photo ...

2008

Influence of pressure and silane depletion on microcrystalline silicon material quality and solar cell performance

Christophe Ballif, Andrea Feltrin, Grégory Bugnon

Hydrogenated microcrystalline silicon growth by very high frequency plasma-enhanced chemical vapor deposition is investigated in an industrial-type parallel plate R&D KAI (TM) reactor to study the influence of pressure and silane depletion on material qual ...

2009

Limiting factors in the fabrication of microcrystalline silicon solar cells and microcrystalline/amorphous (‘micromorph’) tandems

Christophe Ballif, Arvind Shah, Andrea Feltrin, Grégory Bugnon

This contribution presents the status of amorphous and microcrystalline silicon solar cells on glass, and discusses some material/fabrication factors that presently limit their conversion efficiency. Particular attention is focused on recent results and de ...

2009

Resistive interlayer for improved performance of thin film silicon solar cells on highly textured substrate

Christophe Ballif, Matthieu Despeisse, Andrea Feltrin, Grégory Bugnon, Michael Elias Stückelberger, Peter Cuony

The deposition of thin-film silicon solar cells on highly textured substrates results in improved light trapping in the cell. However, the growth of silicon layers on rough substrates can often lead to undesired current drains, degrading performance and re ...

AIP American Institute of Physics2010

Study of the microstructure transition width from amorphous to microcrystalline silicon as a function of the input silane concentration

Christophe Ballif, Christoph Hollenstein, Andrea Feltrin, Benjamin Strahm, Grégory Bugnon

Amorphous and microcrystalline silicon have been proven to be very interesting for low cost thin film photovoltaic devices. Usually these two materials are deposited using the same large area plasma-enhanced chemical vapor deposition reactors from silane a ...

2009

Input silane concentration effect on the a-Si:H to uc-Si:H transition width

Christophe Ballif, Christoph Hollenstein, Andrea Feltrin, Benjamin Strahm, Grégory Bugnon, Fanny Sculati-Meillaud

In this work the microstructure transition width from amorphous to microcrystalline silicon is discussed. It is shown that the width of the transition depends on the input silane concentration level and indirectly on the silane depletion level. The higher ...

2010

Development of Micromorph Cells in Large-Area Industrial Reactor

Christophe Ballif, Matthieu Despeisse, Andrea Feltrin, Gaetano Parascandolo, Grégory Bugnon

The influences of the deposition pressure and silane depletion on the efficiency of single-junction microcrystalline silicon solar cells has been investigated. The efficiency is found to correlate with the ion energy which affects the density of states in ...

2009

Localization-dependent photoluminescence spectrum of biexcitons in semiconductor quantum wires

Benoît Marie Joseph Deveaud, Vincenzo Savona, Andrea Feltrin

We study exciton and biexciton spectra in disordered semiconductor quantum wires by means of nanophotoluminescence spectroscopy. We demonstrate a close link between the exciton localization length along the wire and the occurrence of a biexciton spectral l ...

2005

Influence of ion bombardment on microcrystalline silicon material quality and solar cell performances

Christophe Ballif, Andrea Feltrin, Grégory Bugnon, Fanny Sculati-Meillaud

Microcrystalline hydrogenated silicon growth with VHF-PECVD was examined in an industrial type parallel plate KAITM reactor. The influence of pressure on material quality was studied in single junction solar cells. Solar cells with their intrinsic layer pr ...

2008

Laser-based plasma diagnostics for PECVD of silicon thin films

Christophe Ballif, Andrea Feltrin, Benjamin Strahm

We present two laser systems to monitor plasma conditions in a plasma-enhanced chemical vapor deposition chamber. The first optical system is a high-resolution quantum cascade laser-based infrared absorption spectrometer designed to measure the input silan ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2009

Micromorph tandem solar cells grown at high rate with in-situ intermediate reflector in industrial KAI PECVD reactors

Christophe Ballif, Andrea Feltrin, Grégory Bugnon

We report on the latest results of tandem micromorph (a-Si:H/μc-Si:H) silicon solar cells fabricated in commercial Oerlikon Solar KAI-S and KAI-M PECVD reactors. First developments of in-situ silicon oxide based intermediate reflector (SOIR) in KAI reactor ...

2008

Conducting two-phase silicon oxide layers for thin-film silicon solar cells

Christophe Ballif, Andrea Feltrin

We present optical properties and microstructure analyses of hydrogenated silicon suboxide layers containing silicon nanocrystals (nc-SiOx:H). This material is especially adapted for the use as intermediate reflecting layer (IRL) in micromorph silicon tand ...

2009