Keywords: Cu2Te particles, solar cells, superstrate, ball milling, printing, copper telluride, absorber layers
Cu2Te solar cells fabricated by printing
Cu2Te particles were synthesised by ball milling and then printed on an In2S3/TiO2/FTO–glass substrate, resulting in superstrate–structured solar cells. The as–prepared Cu2Te particles were amorphous, but their crystallinity was improved after annealing at 400–650°C. The Cu2Te particles annealed at 400°C, melted partially, and a completely melted Cu2Te film was obtained at annealing temperatures of 600–650°C. The band gap of the Cu2Te films annealed at 400–600°C was approximately 0.8 eV. The photovoltaic characteristics of the best full Cu2Te cells were as follows: short–circuit current, 21 mA/cm²; open–circuit voltage, 0.24 V; fill factor, 0.3; and energy conversion efficiency, 1.57%. Thus, Cu2Te with its low melting point and high photocurrent is a promising candidate absorber layer for solar cell applications.