Journal
NANOTECHNOLOGY
Volume 28, Issue 43, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aa81dd
Keywords
CZTS nanocrystals; CZTS/Si heterojunction; solar cell; environmental friendly synthesis route
Funding
- DST-ICF Project Government of India [DST/TM/CERI/C74(G)]
- DST Inspire [IFA 13-MS-09]
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CZTS nanocrystals have been synthesized via a new facile and environmentally friendly route using olive oil at a relatively low temperature. Nanocrystals synthesized using olive oil have a smaller average size in comparison to those synthesized with a conventional solvent-like ethylenediamine. Nanocrystals with an average diameter of 40, 20 and 6 nm have been extracted from the olive oil at different centrifugation speeds of 500, 1000 and 2000 rpm, respectively. The photovoltaic characteristics of p-CZTS/n-Si heterojunctions fabricated using the synthesized colloidal quaternary nanocrystals are demonstrated. The device fabricated with smallest sized CZTS nanocrystals, having an average diameter of similar to 6 nm, exhibits an enhancement in power conversion efficiency of 61% in comparison to that of the device fabricated with the nanocrystals of 40 nm in diameter. A lower reflectance and higher minority carrier life time along with a larger surface-to-volume ratio resulted in an enhanced power conversion efficiency for smaller sized CZTS nanocrystals.
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