Highly Efficient and Stable Large Area Flexible Perovskite Solar Cells Enabled by Cross-Linkable Silane Doping of Fullerene Derivative.
Fullerenes have sparked a lot of attention in recent years as a way to improve the existing high-performing p-i-n perovskite solar cells. Most the pristine fullerenes, display issues with layer morphology, device stability, and performance. Therefore, the introduction of dopants in fullerenes has been demonstrated multiple times to be beneficial by reduced transport losses, and decrease the charge-injection barrier at electrodes, resulting from the position shift of Fermi level relative to the carrier level. In this work, new cross-linkable silanes based on halide alkylammonium salts (HAS) are investigated in terms of the chemical structures by various spectroscopy techniques and via computational simulations. Furthermore, flexible perovskite solar cells were fabricated by incorporating three different silanes into the fullerene derivative, with efficiencies surpassing 19% on 1cm2 active area.
Status: Ongoing
Date of proposal: 26/02/2022
Start date: 21/03/2022
End Date: 25/03/2022
Used Instruments: ARKEO - Cicci Research all-in-one platform for J-V, TPC, TPV, and EIS measurements.
Experimental Technique: Current Density-Voltage (J-V) Measurements. Transient Photovoltage (TPV). Transient Photocurrent (TPC). Electrochemical Impedance Spectroscopy (EIS).
Experiment Description: The project involved fabricating flexible perovskite solar cells by incorporating different silane-based alkylammonium salts (HAS) into a fullerene derivative. The study focused on the interface of the silane-modified electron transporting layer with the perovskite layer.
Type Samples: Flexible perovskite solar cells with varied silane doping in the fullerene derivative.
Sample Description: Devices with 1cm2 active area in a p-i-n configuration, using perovskite material based on the composition of mixed cations and mixed halides Cs0.04(MA0.17FA0.83)0.96Pb(I0.83Br0.17)3.
Experiment Data Type: J-V characteristics under varied light intensities. TPC and TPV data for charge extraction and recombination dynamics. EIS data for charge transfer processes.
Characterization Technics: Electrical and electrochemical characterization including J-V, TPV, TPC, and EIS measurements.
Characterization Data Type: Electrical performance parameters of the cells under different light conditions. Charge carrier dynamics and interface properties.
Analyzed Data: Effectiveness of different silane doping on the performance of perovskite solar cells. Analysis of the interface properties and charge carrier dynamics in the cells.
Main Targets Project: Enhancing the performance and stability of flexible perovskite solar cells through silane doping. Understanding the impact of silane-modified electron transporting layers on device performance.
Main Achievements Findings: The device doped with KM105 silane exhibited higher voltage and current at different sun intensities compared to reference cells. Improvement in carrier extraction efficacy and increased recombination time with the 105 dopant, leading to better performance. Observations of increased recombination resistance and reduced non-radiative recombination at the interface.