Investigation of Cu2ZnSnS4 thin films with controllable Cu composition and its influence on photovoltaic properties for solar cells

The effects of Cu composition on the structural, morphological, optical properties of Cu2ZnSnS4 (CZTS) films prepared by RF magnetron sputtering and a post sulfurization, and CZTS solar cells performance have been investigated. The crystal structure characterized by XRD patterns, Raman and far-infra...

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Bibliographic Details
Published in:Journal of alloys and compounds 2017-02, Vol.694, p.833-840
Main Authors: Li, Xinran, Cao, Huiyi, Dong, Yuchen, Yue, Fangyu, Chen, Ye, Xiang, Pinghua, Sun, Lin, Yang, Pingxiong, Chu, Junhao
Format: Article
Language:English
Subjects:
Composition control
Composition effects
Conduction bands
Copper zinc tin sulfide
Crystal structure
Cu2ZnSnS4
Effects
Far infrared radiation
Grain growth
Infrared spectra
Magnetic properties
Magnetron sputtering
Molybdenum
Optical properties
Photoluminescence
Photoluminescence spectra
Photovoltaic cells
Radiative recombination
Secondary phases
Solar cell
Solar cells
Sulfurization
Temperature
Thin films
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Summary:The effects of Cu composition on the structural, morphological, optical properties of Cu2ZnSnS4 (CZTS) films prepared by RF magnetron sputtering and a post sulfurization, and CZTS solar cells performance have been investigated. The crystal structure characterized by XRD patterns, Raman and far-infrared spectra reveal that the secondary phases (e.g. SnS and Cu2SnS3) can be suppressed effectively by manipulating the Cu content in CZTS thin films. Furthermore, morphological studies indicate that the CZTS thin film with low Cu content shows a bilayer structure, while that with high Cu content exhibits the grain growth throughout the entire absorber film with some voids at the Mo/CZTS interface. Finally, a Cu-poor CZTS solar cell with 3.46% is fabricated. Temperature and excitation-power dependent Photoluminescence measurement reveals the radiative recombination between electrons in conduction band tails and holes bound to the neighboring acceptors levels in Cu-poor CZTS device. The diode parameters of Cu-poor CZTS solar cell are extracted and used to discuss the possible reason for limiting efficiency. [Display omitted] •CZTS thin films and solar cells with different Cu content are prepared.•The secondary phases can be suppressed by manipulating the Cu content.•The fluctuating potential model is confirmed by photoluminescence measurement.•The effects of Cu composition on the properties of CZTS solar cells are studied.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.10.024