چكيده به لاتين
Abstract:
To produce the absorber layer material for thin-film solar cells, copper-zinc-tin-sulfide Cu2ZnSnS4 (CZTS) thin films were prepared from a sol-gel four-component solution in a simple, inexpensive, and environmentally friendly manner by directly applying it onto a glass substrate in multiple spin-coated layers. Afterwards, the resulting films were thermally processed in a drying oven under circulating air atmosphere without sulfur vapor. The obtained X-ray diffraction peaks indicate that the produced coatings were characterized by the kesterite structure. The calculated optical band gap energy of the obtained films was 1.50 eV. The obtained SEM images showed that the synthesized densely packed CZTS films with large particles were compact and uniform
One of the reasons for lower efficiency of CZTS devices in comparison with the efficiency of CZTSe devices is that despite the former’s greater band gap, secondary phases are formed during kesterites development processes. The best approach for solving these problems and obtaining devices with high efficiency is employing the materials that are composed of sulfur and selenium. Moreover, CZTSSe band gap, which can be controlled by S/Se ratio, plays an important role in deficit of Voc. This idea, together with the structure’s proper design by means of CZTS and CZTSe absorber layers, caused an improvement in kesterite-based solar cells’ performance. The simulation results showed that it is possible to optimize kesterite thin film solar cell’s performance by adding the CZTSe thin layer, whose thickness is about 3% of the thickness in CZTS, between the CZTS lower circuit and its absorber layer.
Keywords: Cu2ZnSnS4, Absorber Layer, Thin Film Solar Cell, Sol-gel Method
