engleski

Optimization of perovskite solar cell

The perovskite solar cells (PSC) represent a very promising option for next-generation of photovoltaics. Since their discovery in 2009 [1], PSC have drawn great attention. Their favourable properties, like high absorption coefficient, low recombination rate, high mobility of charge carriers, tuneable bandgap and low-cost preparation techniques, results in many researches of these materials lately. The use of methylammonium lead triiodide (MAPbI3) and formamidinium lead triiodide (FAPbI3) as absorber perovskite layer in PSCs have been extensively studied [2]. The results have shown that FAPbI3 is thermally more stable which makes it the most promising perovskite material for single-junction PSCs. Recently, rubidium and caesium cations (Rb+ and Cs+) incorporation emerged as a strategy to enhance PSCs efficiency [3]. Following these results, we have synthesised the formamidinium lead triiodide with Rb and Cs (RbCsFAPbI3) as an absorber perovskite layer. Our PSC device is consisted of several layers, ITO/TiO2/Perovskite/Spiro-OMeTAD/Au, with a power conversion efficiency of 7%. In order to increase the PCE of our device we have performed the simulation of PSC to understand which parameters can affect its performance and what is the highest PCE we can achieve. The simulation is done by using solar cell capacitance simulator (SCAPS) under AM1.5G illumination. The parameters we have simulated were absorber thickness, doping and defect concentration as well as the influence of resistivity on solar cell performance. The results have shown that the highest influence on PCE comes from resistivity of solar cell which is related to its structure. The better structural quality of the sample (less defects, such as pinholes, in absorber layer and its top and bottom interface layers) means less serial resistivity in solar cell model, and using an ideal situation (perfect structure with no defects) we came to PCE with theoretical limit of 15%. This work has been supported by Croatian Science Foundation, IP-2018-01-5246.

perovskite solar cell ; SCAPS ; simulation

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