INVESTIGATION OF CS2AGINBR6 AND CS2AGGABR6 -BASED DOUBLE PEROVSKITE SOLAR CELLS: A STUDY OF SOLAR CELL PARAMETERS USING SCAPS-1D SIMULATION SOFTWARE

Abstract

In Perovskite to get rid of toxicity of lead-based perovskite solar cell and to increase its efficiency various Materials are under research among them double perovskite solar cells (DPSCs) are promising with high efficiency. Lead free DPSCs recently attracted lots of research Interest because of its viability as a promising perovskite absorber layer in the device architecture along with its reasonable cost, remarkable stability and high performance. The lead and non-biodegradable material-based Perovskite solar cells (PSCs) are still a hurdle to its commercialization. Cs2AgGaBr6-based DPSC promised high efficiency in previous studies and we investigate it further. ZnSe, IGZO, WS2, TiO2, ZnO and CeO2 were chosen as ETLs, while Spiro OMeTAD, CuO, PEDOT: PSS, P3HT, CBTS, and Cu2O were chosen as HTLs. Using the SCAPS-1D solar cell simulation program, we thoroughly investigated the properties of solar cell layers to determine the optimum structure: CBTS/Cs2AgGaBr6/ZNSe. ETL and HTL with high mobility of charge carriers and absorption coefficient is required for desired performance of DPSC. Cs2AgGaBr6 exhibits a direct bandgap of 1.42 eV and a semiconducting nature. In order to attain the highest possible power conversion efficiency (PCE), the device structure of multiple cells was examined. Of these, a cell with ZnSe based ETL and CBTS based HTL produced best efficiency, 30.26% at a thickness of 600 nm. We have also investigated a non-toxic inorganic material i.e., Cs2AgInBr6 using SCAPS-1D software. we optimized various parameters like Defect density (Nt), thickness, operating temperature and electron affinity (χ) of perovskite absorber layer (Cs2AgInBr6). Effect of various ETLs and HTLs on the performance device is also analyzed. At absorber layer thickness of 600 nm, the Cs2AgInBr6-based DPSC has achieved maximum efficiency of 26.9%. The optimized value of Nt is 1014 and operating temperature is 300 K.