The science behind the research
Kesterite Cu2ZnSnS4 (CZTS) materials have direct band gap energies (ranging from 1.0 eV to 1.5 eV) and high absorption co-efficient (>104 cm−1), which makes it a feasible option for photovoltaic thin film technologies. Compared with CIGS, CZTSSe-based materials consist of earth abundant elements; therefore it is a very promising candidate for low-cost and high-efficiency earth abundant thin film solar cells.
A cutting edge Electrostatic Assisted Vapour Deposition (ESAVD) method has been developed that can deposit high efficiency CZTS thin films using non-vacuum conditions, that have high uniformity (≤ ±5%), with no secondary phase.
Our most recent results show ESAVD produced CZTS solar cells with efficiency of 6.5%. This was achieved by improving the processing steps and alkaline metal ion incorporation.
|Fig 1. SEM cross section of CZTS solar cell|
|Fig 2. IV curve for CZTS solar cells|
- J. P. Liu, K. L. Choy, M. Placidi , J. López-García, E. Saucedo , D. Colombara, E. Robert "Fabrication and characterization of kesterite Cu2ZnSnS4 thin films deposited by electrostatic spray assisted vapour deposition method" Physica Status Solidi A, 212, No. 1, 135-139 (2015) . DOI: 10.1002/pssa.201431374
- G. Altamura, M. Wang, K. Choy "Environmentally friendly and non-vacuum Electrostatic Spray Assisted Vapor Deposited Cu2ZnSn(S,Se)4 using different non-toxic solvents "EMRS Spring meeting 2015.Lille,France
For further information contact Prof Kwang-Leong Choy
+44 (0)20 7679 3855 | email@example.com