Device Modeling and Optimization of Perovskite Solar Cells

Perovskite solar cells combine a crystalline light-absorbing layer with selective carrier transport layers to achieve remarkable power conversion efficiencies at low fabrication costs. Device modelling plays a central role in understanding the interplay between material properties—such as defect density, layer thickness and work function—and photovoltaic performance metrics including open-circuit voltage, short-circuit current density and fill factor. Numerical simulators, notably SCAPS-1D, enable systematic variation of absorber composition (lead-based or lead-free), electron transport layer and hole transport layer parameters to identify optimal device architectures. Through iterative optimisation, researchers have pinpointed absorber thicknesses on the order of hundreds of nanometres, achieved defect tolerances exceeding 10¹⁴ cm⁻³ and demonstrated the importance of high-work-function contacts for efficient carrier extraction. Beyond idealised devices, modelling studies now address stability and toxicity by exploring tin-based and double-perovskite alternatives, as well as simplified, transport-layer-free structures. Together, these efforts guide experimental fabrication, accelerate the discovery of environmentally benign materials and move perovskite photovoltaics closer to commercial viability.

Research from Nature Portfolio

Recent studies have modelled a lead-free CH₃NH₃SnI₃-based solar cell under standard illumination conditions to explore the impact of absorber thickness, acceptor concentration and defect density on device performance. Simulations indicate an optimal absorber layer of approximately 500 nm, combined with a reduced acceptor concentration and defect density around 10¹⁴ cm⁻³, yields a simulated power conversion efficiency exceeding 28%. The work further highlights the critical role of high-work-function anodes to maximise open-circuit voltage and fill factor. These findings open new avenues for achieving high efficiencies in tin-based perovskite devices while addressing stability concerns associated with Sn²⁺ oxidation.

Device Modeling and Optimization of Perovskite Solar Cells publication trend

The graph below shows the total number of articles in device modeling and optimization of perovskite solar cells across all publications each year (not limited to Nature Index journals).

Technical terms

Perovskite: A crystalline material with ABX₃ structure, where ‘A’ and ‘B’ are cations and ‘X’ is an anion; serves as the light absorber.

Absorber layer: The semiconducting film that absorbs photons and generates charge carriers.

Electron transport layer (ETL): A semiconductor layer facilitating collection and transport of electrons to the cathode.

Hole transport layer (HTL): A semiconductor layer facilitating collection and transport of holes to the anode.

Defect density: The concentration of structural or electronic imperfections in a material, typically expressed in cm⁻³.

Work function: The minimum energy required to remove an electron from a material’s surface to the vacuum level.

Power conversion efficiency (PCE): The ratio of electrical power output to incident solar power input, expressed as a percentage.

Fill factor (FF): A measure of the squareness of the current–voltage curve, defined as the ratio of maximum obtainable power to the product of open-circuit voltage and short-circuit current.

Open-circuit voltage (Voc): The maximum voltage available from a solar cell under open-circuit conditions.

References

1. Device simulation of highly efficient eco-friendly CH3NH3SnI3 perovskite solar cell. Scientific Reports (2021).
2. Defect Study and Modelling of SnX3-Based Perovskite Solar Cells with SCAPS-1D. Nanomaterials (2021).
3. Numerical study of high performance HTL-free CH3NH3SnI3-based perovskite solar cell by SCAPS-1D. AIP Advances (2021).
4. Numerical Modeling and Optimization of Lead‐Free Hybrid Double Perovskite Solar Cell by Using SCAPS‐1D. Journal of Renewable Energy (2021).
5. Perceiving of Defect Tolerance in Perovskite Absorber Layer for Efficient Perovskite Solar Cell. IEEE Access (2020).