Interface-optimized hole transport materials for highly stable and efficient perovskite solar cells.
The interfaces of a perovskite solar cell (PSC) are crucial not only for the performance but also the stability of the device. It has been found that halo-functional hole transport materials (HTMs) can anchor to the perovskite surface creating an ordered and uniform layer, improving their resilience to degradation, as well as suppressing ion migration and recombination. This study aims to combine halogen bonding with substituents specifically designed to interact with the device electrodes, in order to further promote device stability and to extend the benefits to both conventional and inverted device structures. To this end, the two HTM variants will be synthesized with thiol and carboxylic acid groups, respectively. The fabricated PSCs are expected to become another step towards very stable and cost-effective perovskite solar cells.
Status: Ongoing
Date of proposal: 28/02/2023
Start date: 22/05/2023
End Date:
Used Instruments: NMR (Nuclear Magnetic Resonance) and mass spectrometry for HTM synthesis confirmation. Arkeo solar simulator for J-V measurements. AFM (Atomic Force Microscopy) for HTM film analysis (planned, not conducted during the reported period).
Experimental Technique: Synthesis and characterization of novel hole transport materials (HTMs). J-V measurements under 1 sun illumination. IPCE (Incident Photon to Converted Electron) measurements. Photoluminescence spectroscopy.
Experiment Description: Testing of three novel HTMs (TC-ICA, TC-CA, TC-I) in p-i-n structure lead-based perovskite solar cells. Optimization of layer thickness by varying spin coating solution concentration. Comparative analysis of device performance using different HTMs.
Type Samples: Perovskite solar cells with different HTMs.
Sample Description: Solar cells structure: ITO|HTM|perovskite|C60|BCP|Cu. Double-cation CsFAPbIBr perovskite doped with various additives.
Experiment Data Type: Photovoltaic parameters (Efficiency, JSC, VOC, FF). IPCE measurements. Photoluminescence spectra.
Characterization Technics: J-V curve measurements. IPCE analysis. Photoluminescence spectroscopy.
Characterization Data Type: J-V curve data (efficiency, open-circuit voltage, short-circuit current, fill factor). IPCE ratio and integrated current densities. Photoluminescence spectra of HTM/perovskite films.
Analyzed Data: Comparative performance of different HTMs in solar cells. Assessment of the efficacy of HTMs in charge transfer and device performance. Initial observations on the stability of solar cells with different HTMs (limited due to equipment failure).
Main Targets Project: Evaluation of novel HTMs for p-i-n structure perovskite solar cells. Optimization of device performance and stability through HTM modification.
Main Achievements Findings: TC-ICA-based devices showed comparable performance to reference HTM (MeO-2PACz). TC-I resulted in lower performance, while TC-CA showed similar performance to TC-ICA but with potential stability issues. No significant difference in performance observed between different concentrations of TC-ICA.