CZTS thin film solar cells

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.

Ongoing research

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

SEM cross section of CZTS solar cell.jpg
 Fig 2. IV curve for CZTS solar cells

IV curve for CZTS solar cells.jpg

Recent publications

Conference presentations

  • 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 | k.choy@ucl.ac.uk