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Improving the photovoltaic performance of co‐evaporated Cu 2 ZnSnS 4 thin‐film solar cells by incorporation of sodium from NaF layers
Author(s) -
Mise Takahiro,
Tajima Shin,
Fukano Tatsuo,
Higuchi Kazuo,
Washio Tsukasa,
Jimbo Kazuo,
Katagiri Hironori
Publication year - 2016
Publication title -
progress in photovoltaics: research and applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.286
H-Index - 131
eISSN - 1099-159X
pISSN - 1062-7995
DOI - 10.1002/pip.2745
Subject(s) - czts , materials science , layer (electronics) , solar cell , photovoltaic system , microstructure , thin film , sodium , optoelectronics , active layer , diode , chemical engineering , nanotechnology , metallurgy , thin film transistor , electrical engineering , engineering
We have investigated the influence of sodium (Na) on the properties of co‐evaporated Cu 2 ZnSnS 4 (CZTS) layer microstructures and solar cells. The photovoltaic performance and diode properties were improved by incorporating Na from NaF layers into the CZTS layers, while Na had a negligible effect on the microstructural properties of the layer. The best cell fabricated by using an optimal CZTS layer (Cu/(Zn + Sn) = 0.70, Zn/Sn = 1.8) yielded an active area efficiency of 5.23%. The analysis of device properties suggests that charge‐carrier recombination at CZTS/CdS interface is suppressed by intentional Na incorporation from NaF layers. Copyright © 2016 John Wiley & Sons, Ltd.