University of Twente Student Theses


Investigating electrodeposition to grow CZTS thin films for solar cell applications

Reith, Pim and Hopman, Gerben (2012) Investigating electrodeposition to grow CZTS thin films for solar cell applications.

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Abstract:The search for alternative energy sources has solar energy as one of the primary solutions. Thin �lm solar cells are a technology that uses less materials, but still keeps or even beats e�ciencies of normal silicon solar cells. However, some of the materials used in thin �lm solar cells are either rare or toxic. In this project, copper zinc tin sul�de (CZTS) thin �lms grown on indium tin oxide (ITO) substrates by electrodeposition are investigated as a possible absorber layer in thin �lm solar cells. The goal is to �nd out whether electrodeposition followed by a sulfurization step is a good method of growing these �lms. Using an electrolyte containing all four elements of CZTS, optimal growth was achieved at potentials between -1.0 and -1.1 V, growing between 40 and 50 minutes. As-deposited �lms contained no CZTS, but annealing produced islands of stoichiometric CZTS. However, uniform coverage of the substrate was not achieved. Using an electrolyte containing only copper, zinc and tin, and adding the sulfur through annealing, yielded better results, achieving uniform coverage over almost the entire deposition area. Measurements showed, though, that the annealed �lm contained too much tin (in the form of tin sul�des), which means the three metals were not deposited in the correct ratios. More research into this method could lead to good results for the electrodeposition of CZTS.
Item Type:Essay (Bachelor)
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics BSc (56962)
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