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Large Efficiency Improvement in Cu 2 ZnSnSe 4 Solar Cells by Introducing a Superficial Ge Nanolayer
Author(s) -
Giraldo Sergio,
Neuschitzer Markus,
Thersleff Thomas,
LópezMarino Simón,
Sánchez Yudania,
Xie Haibing,
Colina Mónica,
Placidi Marcel,
Pistor Paul,
IzquierdoRoca Victor,
Leifer Klaus,
PérezRodríguez Alejandro,
Saucedo Edgardo
Publication year - 2015
Publication title -
advanced energy materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.08
H-Index - 220
eISSN - 1614-6840
pISSN - 1614-6832
DOI - 10.1002/aenm.201501070
Subject(s) - materials science , solar cell , germanium , solar cell efficiency , energy conversion efficiency , nanotechnology , chemical engineering , optoelectronics , engineering physics , silicon , physics , engineering
A large improvement in Cu 2 ZnSnSe 4 solar cell efficiency is presented based on the introduction of a Ge superficial nanolayer. This improvement is explained by three complementary effects: the formation of a liquid Ge‐related phase, the possible reduction of Sn multicharge states, and the formation of GeO x nanoinclusions, which lead to an impressive solar cell ( V OC ) increase.