研究目的
Investigating the interaction between halide segregation, electronic trap states, and electric fields in mixed-halide perovskite photovoltaic devices.
研究成果
The study identifies three distinct defect species in mixed-halide perovskites and their roles in charge-carrier dynamics and halide segregation. It also demonstrates that charge-carriers can be extracted from iodide-rich regions, suggesting percolation pathways through grain boundaries. These findings contribute to understanding the limitations and potential improvements for mixed-halide perovskite photovoltaic devices.
研究不足
The study focuses on MAPb(Br0.5I0.5)3, which may not fully represent the behavior of other mixed-halide perovskites. The experimental conditions, such as vacuum and specific illumination intensities, may not replicate real-world solar cell operating conditions.
1：Experimental Design and Method Selection
Photoluminescence (PL) and time correlated single photon counting (TCSPC) techniques were used to study trap states and halide segregation in full mixed-halide perovskite photovoltaic devices under various applied voltages.
2：Sample Selection and Data Sources
MAPb(Br0.5I0.5)3 photovoltaic devices were used, with SnO2 and spiro-OMeTAD as the electron and hole transport layers, respectively. Gold and fluorine doped tin oxide (FTO) were used as the top and bottom contact layers.
3：List of Experimental Equipment and Materials
400 nm laser for illumination, AM1.5 spectrum generated by a class AAA Oriel Solar Simulator, vacuum conditions for some experiments.
4：Experimental Procedures and Operational Workflow
Devices were subjected to various applied voltages under illumination, with PL and TCSPC measurements taken to observe changes in radiative efficiency and charge-carrier lifetimes. EQE measurements were also performed to study current extraction dynamics.
5：Data Analysis Methods
PL spectra were integrated over specific wavelength ranges to observe changes in perovskite phases. Charge-carrier lifetimes were analyzed from TCSPC decay traces. EQE spectra were analyzed to determine contributions from different perovskite phases.
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