Selective contacts based on chalcogenides and calco-halides for peroskite solar cells
Recent experimental results demonstrates the potential of thin film chalcogenides as selective contacts for high efficiency solar cells. One of the main advantages of this family of materials is the ability to easily tune the bandgap as well as the bands position, to be a highly selective contact for holes or electrons. In this work we propose to investigate a new clase of low-dimensional chalcogenides (Sb2(S,Se)(3) and chalcohalides (SbSe(Br,I)) deposited by co-evaporation techniques as selective contacts in perovskite technologies. These materials have shown a high flexibility in terms of bands design, as well as control of the conductivity from n to p-type. These selectives contacts will be prepared by co-evaporation at UPC, and then tested at UNITOV partner of VIPERLAB innitiative, to demonstrate the first selective contacts based on low dimensional chalcogenide and chalco-halide compounds for perovskite. Solar cell devices will be fabricated and fully characterized.
Status: Ongoing
Date of proposal: 31/05/2022
Start date: 01/11/2022
End Date: 30/11/2022
Used Instruments: Glove box with Spin coating, oven, hot plate, balance. Solar simulator. Lasers.
Experimental Technique: Deposition of Sb2Se3 by co-evaporation. Hot plate treatment in argon environment. Solar cell fabrication with various thicknesses of ETL and HTL.
Experiment Description: The project's aim was to test the potential of calco-halides developed by UPC (Universitat Politècnica de Catalunya) on the perovskite developed at CHOSE (The Centre for Hybrid and Organic Solar Energy) as a selective contact. It involved fabricating solar cells with different configurations and thicknesses, primarily focusing on the electron transport layer (ETL) and hole transport layer (HTL).
Type Samples: FTO-based substrates patterned with different configurations and silver contacts for carrier collection.
Sample Description: Substrates with FTO alone, compact TiO2, and a normal FTO/Compact TiO2/mesomorphic TiO2 configuration. Samples 1 and 2 had 150 nm Sb2Se3 deposited. Samples 3 to 8 had different configurations including HTLs like Spiro-OMeTAD and PTAA.
Experiment Data Type: Solar cell performance data. Structural and compositional details of the different layers.
Characterization Technics: Solar cell performance measurement using a solar simulator. Structural and compositional analysis of layers.
Characterization Data Type: Performance metrics of solar cells with different ETL and HTL thicknesses. Structural and compositional characteristics of the layers.
Analyzed Data: Effectiveness of calco-halides as selective contacts in perovskite solar cells. Impact of varying the ETL and HTL thicknesses on cell performance.
Main Targets Project: Evaluating the potential of calco-halides as selective contacts in perovskite solar cells. Testing different configurations and thicknesses of ETL and HTL for optimal solar cell performance.
Main Achievements Findings: No photovoltaic response in most cases, indicating possible misalignment of strips or faults in fabrication or transport. Variations in device performance based on different configurations and thicknesses. Need for further characterization to understand the lack of response in many devices.