Photostability of laser annealed MAPbI3 under different spectral regions.
Organic Inorganic Halide Perovskites (OIHPs) solar cells have shown power conversion efficiencies (PCE) up to 25.6% on a lab scale. However, one of the challenges in large-scale manufacturing of solution-based perovskite solar cells (PSCs) is to prolong uniform heat treatment of the wet perovskite film over a large surface. One possibility is laser annealing as an alternative to conventional thermal treatment. Along with upscaling, Light Induced Degradation (LID) of PSCs under the operating conditions is one of the major bottlenecks towards commercialization. However, a detailed overview is lacking on the effect of various spectral regions of sunlight on PSCs fabricated outside the N2 filled glove boxes. In this work, we would study the stability of our laser annealed PSCs as compared to thermally annealed PSCs.
Status: Ongoing
Date of proposal: 28/02/2022
Start date: 03/04/2023
End Date: 09/06/2023
Used Instruments: Solar simulator. Electroluminescence imaging system. Scanning electron microscopy (SEM).
Experimental Technique: Continuous illumination testing. Current-Voltage (J-V) measurements under Maximum Power Point Tracking (MPPT). Electroluminescence (EL) imaging SEM analysis.
Experiment Description: The project aimed to understand the stability of perovskite solar cells using a modified spacer interlayer under continuous illumination. It involved MPPT tracking of uncapped perovskite solar cells and analysis of the aging and degradation behavior of these cells.
Type Samples: Perovskite solar cells with and without an oxide buffer layer.
Sample Description: Perovskite solar cells with a modified spacer interlayer between the perovskite and the hole transport layer in a classical n-i-p device architecture.
Experiment Data Type: Performance data under MPPT tracking. Electroluminescence imaging results. Morphological changes observed in SEM images.
Characterization Technics: Continuous illumination tests to evaluate aging and degradation. EL imaging for analyzing shunt pathways and cell performance. SEM for assessing morphological changes.
Characterization Data Type: J-V characteristics and normalized PCE. EL images indicating performance and formation of shunt pathways. SEM images showing morphological changes in the perovskite films.
Analyzed Data: Comparison of stability and performance of control and target samples under continuous illumination. Analysis of degradation patterns in uncapped cells.
Main Targets Project: Studying the aging and degradation behavior of perovskite solar cells with and without an oxide buffer layer. Understanding the impact of continuous illumination on cell stability and performance.
Main Achievements Findings: Target samples with the modified interlayer showed better stability and less performance degradation under continuous illumination compared to control samples. Electroluminescence imaging revealed more shunt pathways in control samples. SEM analysis indicated morphological changes and degradation patterns in perovskite films, especially along grain boundaries.