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CEA Tech
PhD position - Interaction mechanisms of hydrogen with defects of silicon bulk and at the interfaces of passivated contacts in PV cells
CEA Tech
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JOB DETAILS
Published: 7 days ago
Application deadline: Oct 31
Location: Grenoble, France
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PhD position - Interaction mechanisms of hydrogen with defects of silicon bulk and at the interfaces of passivated contacts in PV cells

SL-DRT-19-0595

RESEARCH FIELD

Materials and applications

ABSTRACT

Although fluctuating, the photovoltaic market is still dominated by silicon technologies occupying ~94%. The most promising homo-junction cell architectures systematically integrate a so-called "passivated" contact through a stack of polycrystalline silicon on tunnel oxide. The hydrogenation of such structures makes it possible to achieve very efficient yields >25%. However, the introduction of hydrogen can also lead to layer delamination or resistive losses through accumulation effects at the interfaces, significantly degrading the efficiency of the final device. To avoid its effects and develop this type of structure with associated yields, it is essential to understand the interactions of hydrogen involved and to understand its role in passivation phenomena. However, hydrogen is an extremely difficult element to characterize by its very nature. Its characterization therefore represents a real challenge, to which are added the difficulties related to the textured surface state of solar silicon and the configuration of poly-Si/Si/SiOx/Si interfaces. To meet this challenge, the work proposed here will be to implement and correlate characterization techniques, allowing both to locate and quantify hydrogen in the volume of silicon and at the interfaces of passivated contact structures. The implementation of a characterization methodology will lead to the main objective of the thesis, which is to propose mechanisms of hydrogen interaction with defects and its role in the quality of passivated contacts. This will open up opportunities for the development and optimization of passivated contact structures. This study will benefit from the infrastructure for the realization of samples from CEA-LITEN in INES and the means of characterization of the nano-characterization platform with its expert environment.

LOCATION

Département des Technologies Solaires (LITEN)

Laboratoire Matériaux et Procédés Silicium

Grenoble

CONTACT PERSON

CABAL Raphaël

CEA

DRT/DTS//LHMJ

CEA - INESBatiment ALOUETTE 3BP332 - 50 avenue du Lac Léman73375 Le Bourget du Lac

Phone number: 0479792075

Email: raphael.cabal@cea.fr

START DATE

Start date on 01-10-2019

THESIS SUPERVISOR

BARNES Jean-Paul

CEA

DRT/DTSI/SCMC/Autre

17 rue des Martyrs38054 GrenobleFrance

Phone number: 0438782685

Email: jean-paul.barnes@cea.fr

« The age limit is 26 years for PhD offers and 30 years old for post-doc offers. »

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