Experimental and SCAPS simulated formamidinium perovskite solar cells: A comparison of device performance

By S. Karthick, S. Velumani, J. Bouclé. 2020

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Abstract In this study, experimental photovoltaic performance and their numerical SCAPS-1D simulations are compared for methylammonium-free perovskite solar devices based on the formamidinium organic cation. Experimentally, it is established that the incorporation of small amounts of cesium ( Cs + ) and bromide ( Br - ) into HC ( N H 2 ) 2 P b I 3 ( F A P I ) stabilizes the optically active α - F A P b I 3 black phase, and boost the power conversion efficiency (PCE) of associated devices from 4 to 15% under standard illumination. The effect of series and shunt resistances ( R series & R shunt ) were theoretically evaluated and discussed by modeling the electrical characteristics of the cell as a function of active layer composition, using the SCAPS-1D software. Ideal devices built without these parasitic resistances do not match the experimental trends, although they reflect the influence of bandgap edge on the photocurrent generation. Feeding the experimental R series and R shunt values to SCAPS allows us to interpret the main limitations to the device current-voltage characteristics. The instability of the pure FAPI phase is responsible for the drastic deterioration in R series and R shunt , ultimately influencing the fill factor. Our data clearly confirm the beneficial effect of mixed cation and mixed halides on device operation.

Subfields: Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5d6fa65591b90ed325724f106002a1e033e60c69