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1. (WO2018108403) SILICON HETEROJUNCTION SOLAR CELLS AND METHODS OF MANUFACTURE

Pub. No.:    WO/2018/108403    International Application No.:    PCT/EP2017/078999
Publication Date: Fri Jun 22 01:59:59 CEST 2018 International Filing Date: Tue Nov 14 00:59:59 CET 2017
IPC: H01L 31/0747
H01L 31/18
Applicants: ECOLE POLYTECHNIQUE FEDERALE DE LAUSANNE (EPFL)
Inventors: LÖPER, Philipp
INGENITO, Andrea
BALLIF, Christophe
NOGAY, Gizem
Title: SILICON HETEROJUNCTION SOLAR CELLS AND METHODS OF MANUFACTURE
Abstract:
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 (300), a light-absorbing silicon layer (1 ) arranged between said front electrode and said back electrode layers and a doped silicon-based layer (6) arranged between said light-absorbing silicon layer (1 ) and said back electrode layer, characterized in that said heterojunction photoelectric device further comprises a wide band gap material layer (10) having an electronic band gap greater than 1.4eV, said wide band gap material layer being applied on a surface of the light- absorbing silicon layer (1 ) between said light-absorbing silicon layer and said doped silicon-based layer (6). The present heterojunction layer or stack of layers is compatible with thermal annealing and firing processes at T above 600 °C.