Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 51, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aaab38
Keywords
CZTSSe; PVP; additive; morphology; efficiency
Categories
Funding
- National Natural Science Foundation of China [61774075, 11274135, 61505067, 61604029]
- Science and Technology Development Project of Jilin Province [20170101142JC]
- Specialized Research Fund for the Doctoral Program of Higher Education [20130061130011]
- PhD Programs Foundation of Ministry of Education of China [20120061120011]
- High Performance Computing Center of Jilin University, China
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Kesterite Cu2ZnSn(SxSe1-x)(4) (CZTSSe) thin films and related solar cells were successfully fabricated by a facile sol-gel method and selenization process. The influence of Polyvinylpyrrolidone (PVP) additive on the properties of the CZTSSe films and the power conversion efficiency (PCE) of the solar cells were investigated. The results reveal that the qualities of CZTSSe films can be manipulated by incorporating a small amount of PVP. With addition of 1 wt% of PVP, the smoothness and grain size of the CZTSSe films were greatly improved. The contact at the CZTSSe/Mo interface was also improved. As a result, the optimized PCE of solar cells improved from 2.24% to 4.34% after the addition of 1 wt% PVP due to the decrease of recombination at the interfaces. These results suggest that polymer addition in the precursor solution is a promising method for obtaining high quality of CZTSSe films and high-performance solar cells.
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