Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
The emerge of thin film solar cells like CIGS solar cells can make solar power one of the
main sources of renewable energy in the near future. The main reasons for the high focus on
CIGS solar cells are its benefits of low cost, large area deposition of thin layers and high
efficiency, comparable with silicon based solar cells. But one of the main problems with
CIGS solar cells is the CdS buffer layer and the toxic hazards with its production. ZnS is one
of the most promising materials due to its similarity with CdS and the possibility to use the
same deposition process used in producing CdS, chemical bath deposition (CBD).
The main purpose of this work is to find a process for chemical bath deposition of ZnS
adaptable to TCTechs base line process.
The experiments with Zn/TEA ratios gave the highest productivity of the solar cells where the
best cell had a max product higher than baseline CdS. SEM/EDS analyses helped proving the
formation of ZnS with this setup of CBD deposition. The formation of ZnS was driven by
TEA which helped forming the complex ion [Zn(NH3)3]2+ and minimizing the competing
reactions from forming other crystals than ZnS.
2012. , 52 p.