Browsing by Author "Bandara, J."

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    Dependence of performance of Sb2S3 thin film solar cell on blocking TiO2 layer
    (Uva Wellassa University of Sri Lanka, 2020) Farhana, M.A.; Bandara, J.
    The demand for low cost, high efficiency solar cells is the power of thin film solar cells. In recent years, antimony sulfide (Sb2S3) has much attraction as light harvesting material in solar cell applications. Sb2S3 solar cells are reported with a dense blocking layer and mesoscopic TiO2 scaffold. But still, in both cases, the performance of Sb2S3 solar cells are unsatisfactory. However, planner Sb2S3 solar cells would be more competitive because it is simpler and has a higher open circuit voltage due to reduced charge carrier recombination. Herein, planner Sb2S3 solar cells have been successfully made using spin coated Sb2S3 as the absorber, dense blocking TiO2 (bl-TiO2) as the electron conductor and poly (3-hexathiophene) (P3HT) as the hole conductor. This study pinpointed the dependence of cell performance on the thickness of the blocking TiO2 layer. The bl-TiO2 was deposited by spin coating at rpm with a different number of spin coat cycles (1-5). The TiO2 precursor solution was prepared by mixing of Titanium IsoPropoxide (TTIP), of butol-1-ol and of diethanolamine. The blocking properties and thickness variation of the bl-TiO2 layers fabricated with a various number of spinning cycles were verified by cyclic voltammograms and UV-Vis spectra respectively. The optimization of the TiO2 blocking layer to enhance the device performance was carried out on the planner device consisting of FTO/bl-TiO2/Sb2S3/P3HT/Ag and the optimized device with of bl-TiO2 exhibited the power conversion efficiency of at 1 sun illumination. Keywords: Blocking TiO2, Planner structure, Performance, Sb2S3, and Spin coat cycle