研究目的
Exploring the dependence of light instability on crystal structure in mixed-halide perovskite photovoltaic materials and mapping it across the cubic-tetragonal solvus in the (CsyFA1?y)Pb(BrxI1?x)3 phase diagram.
研究成果
Cs substitution stabilizes mixed-halide CsyFA1?yPb(BrxI1?x)3 perovskites to photoinduced phase segregation, but crystal phase and distance from the phase boundary are not reliable indicators for stability. The positive impact of Cs on optical stability is in good agreement with theories presented in the literature, but the mechanism by which too much Cs substitution can have a negative impact on optical stability is still unclear.
研究不足
The study focuses on the impact of A-site composition in FA/Cs perovskites and does not fully explain the mechanism by which too much Cs substitution can have a negative impact on optical stability. More work is necessary to fully understand both the thermodynamics and kinetics of photoinduced phase segregation.
1：Experimental Design and Method Selection:
The study uses synchrotron X-ray diffraction to map the solvus between the cubic and cubic-tetragonal mixed-phase region and time-dependent photoluminescence to assess stability under illumination.
2：Sample Selection and Data Sources:
Two sets of mixed-halide mixed-cation perovskite thin films of the formula CsyFA1?yPb(BrxI1?x)3 were prepared using an antisolvent method.
3：List of Experimental Equipment and Materials:
SEM images were taken on an FEI XL30 Sirion microscope, XRD data were acquired at beamline 2-1 at the Stanford Synchrotron Radiation Lightsource, and photoluminescence measurements were carried out using an Acton Research SpectraPro spectrograph.
4：Experimental Procedures and Operational Workflow:
Films were prepared using an antisolvent method, characterized by SEM, XRD, and photoluminescence measurements under illumination.
5：Data Analysis Methods:
The presence or absence of tetragonal superlattice peaks was used to determine whether tetragonal phase was present, and residual spectra analysis was used to classify optical stability versus instability.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
