Augmented perovskite solar cell model employing viable materials to improve efficiency

Abstract

This thesis work also presents a comparative analysis of a PSC which consists of TiO2 is ETL, CH3NH3PbI3-xClx as active layer and CuO as HTL with another perovskite solar cell consisting of similar ETL and HTL as that of former perovskite solar cell but different light absorber layer i.e. CH3NH3SnI3. The optimized device architecture of the non-toxic Tin based perovskite solar cell exhibit efficiency (PCE) 31.74% as compared to 25.172% efficiency exhibited by former perovskite solar cells. The results elaborate about the efficiency increase in various Tin based perovskite (CH3NH3SnI3) solar cells incorporating oxides and dichalcogenides of refractory metals viz. oxides of molybdenum (MoOx), molybdenum di-telluride (MoTe2), tungsten di-selenide (WSe2) and molybdenum di-sulphide (MoS2) as HTMs while TiO2 as common ETL. Post simulation the optimized efficiencies were observed to be 31.95%, 30.89%, 31.92% and 31.86% for MoOx, WSe2, MoTe2 and MoS2 based solar cells respectively. The analysis of all five previous chapters is done considering the interface defect layer between ETL/light absorbing layer and light absorbing layer/HTL respectively. However, the simulation study of the perovskite cell described in further chapter has been carried out without considering interface defect layers. In this results chapter, a CH3NH3SnI3 based perovskite solar cell is simulated considering CuSbS2 as HTL and C60 as ETL. The proposed simulation reveals that using 20 nm of CuSbS2 layer is sufficient to outperform costly Spiro-OMeTAD as HTL for cell fabrication. The proposed cell exhibits an efficiency of 26.05% which is better than the efficiency of Spiro-OMeTAD based perovskite solar cells having efficiency 23.35%. newline