**6. Conclusions**

Chalcogenide thin films have received a great deal of attention for decades due to some unique properties. The thin film based supercapacitor can have store the electrical energy for all the electronic devices to stabilize the power supply. Metal nitrates have gotten a lot of interest as supercapacitors electrodes due to showed higher electrical conductivity, higher specific capacitance, good energy density, and excellent mechanical stability. Perovskite solar cell indicated higher power conversion efficiency value. The organic inorganic hybrid perovskite solar cells are very simple, and prepared by sandwiching a perovskite absorber layer between the electron transport layer and hole transport layer, reached power conversion efficiency exceeding 20%. The thin film-based sensors showed high sensitivity and low manufacturing cost. In future, low temperature operation of the thin film sensors is an attractive proposition for the industry. The market shares of silicon based solar cell decreased, while thin film based solar cells increased in the global photovoltaic market due to the low material consumption, low manufacturing cost, shorter energy pack back period. Solar cell market is expected to growth rapidly due to the rising demand for commercial, residential and utility applications.
