Ernesto Flores Abstract
Performance of Superstrate-Type Sb2(S, Se3) Solar Cells.
The interest in the research of solar cells with higher efficiency, cheaper, and less toxic has been increasing due to the increase in the necessity of green energy. Antimony Sulfo-Selenide, Sb2(S,Se)3, is one of the promising photovoltaic materials as it is earth-abundant and less toxic compared to other materials. Here, we made a solar cell with the structure FTO-CdS-Sb2(S,Se)3-HTL-Au. CdS is deposited by the chemical bath deposition (CBD) into the FTO, Sb2(S,Se)3 is deposited onto the CdS substrate by hydrothermal method, hole transport layer (HTL) is deposited by spinning coating method and gold (Au) is deposited by the evaporator. The films that we got from the hydrothermal were annealed at different temperatures i.e 350, 390, and 410 °C in the glove box at nitrogen environment. We optimized the annealing temperature at 390 °C and used three different materials i.e copper thiocyanide (CuSCN), P3CT, and spiro as potential HTL. Spiro is found to be the best HTL in comparison with others in terms of efficiency however we found spiro is unstable and degrade rapidly than other HTL. Solar cells with P3CT as HTL also performed very well and their efficiency is much close with spiro. Also, P3CT is found to be very stable in comparison with any others HTL. For now, the highest efficiency that we got from spiro is -8% and from P3CT is 7.6%. However, still, a lot of parameters are left to be optimized and can be done in the future to get better device performance.