Ecole Polytechnique Federale De Lausanne

Csem Centre Suisse D'electronique Et De Microtechnique Sa&#x2014;recherche Et D&#xe9;veloppement

Ecole Polytechnique Féderale De Lausanne (epfl)

Andrea Ingenito

Christophe Ballif

Philipp Löper

Sylvain Nicolay

Gizem Nogay

Philipp LÖPER

Disclosed is a photovoltaic device including: —a silicon substrate; —a first tunnel layer situated upon at least a first side of the silicon substrate; —a first polycrystalline silicon-based capping layer situated upon the first tunnel layer; and —a second tunnel layer situated upon substantially the entirety of the first polycrystalline silicon-based capping layer. The photovoltaic device further includes: —a second polycrystalline silicon-based capping layer situated upon predetermined zones of the second tunnel layer, areas of the second tunnel layer situated outside of the predetermined zones being free of the second polycrystalline silicon-based capping layer; and —a metal contact situated upon at least part of the second polycrystalline silicon-based capping layer.

Photovoltaic device with passivated contact and corresponding method of manufacture

The present invention relates to a solar cell comprising a heterojunction photoelectric device comprising, a front electrode layer, a back electrode layer comprising a metallic contact layer, a light-absorbing silicon layer arranged between said front electrode and said back electrode layers and a doped silicon-based layer arranged between said light-absorbing silicon layer and said back electrode layer, characterized in that said heterojunction photoelectric device further comprises a wide band gap material layer having an electronic band gap greater than 1.4 eV, said wide band gap material layer being applied on a surface of the light-absorbing silicon layer between said light-absorbing silicon layer and said doped silicon-based layer. The present heterojunction layer or stack of layers is compatible with thermal annealing and firing processes at T above 600&#xb0; C.

Silicon heterojunction solar cells and methods of manufacture

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Neuchâtel, Switzerland

Andrea Ingenito