Preparation And Aging Properties Of Wide-bandgap Perovskite Solar Cells

Hybrid halide perovskite solar cells have excellent photovoltaic performance and theoretical values exceeding most photovoltaic devices,which is one of the reasons why they are the most promising next-generation solar cells for photovoltaic cells.The research on perovskite solar cells（PSCs）has made great strides,and PCE efficiencies of over 25% are now certified.The growth of PCE has benefited from numerous optimization strategies.Researchers continue to explore various engineering methods to passivate perovskite light-absorbing materials to reduce defects in the perovskite bulk phase and interface,and optimize the combination of the perovskite absorber layer with other interfaces.（1）Methylamine chloride（MACl）was added as an additive to the perovskite precursor solution to optimize the photovoltaic performance of perovskite solar cells（PSCs）.The crystallinity of the perovskite film was tested by X-ray diffraction（XRD）,the surface morphology of the perovskite film was tested by scanning electron microscopy（SEM）,and the fluorescence intensity and material loading of the film were tested by steady-state（PL）transient（TRPL）photoluminescence.It is found that the quality of the film has been qualitatively improved after the addition of the additive.It is precisely because of the improvement of the quality of the film that the performance of the perovskite device has been improved in all directions.The photoelectric conversion efficiency（PCE）of PSCs increased from 14.19% for the initial blank sample device to 19.14% for the MACl 45% mol sample device.A high open-circuit voltage of 1.20 V was obtained,and the open-circuit voltage loss（VOC loss）was reduced to 0.54 V.（2）During the preparation and storage of perovskite solar cells（PSCs）,it is a common thing to gradually increase the photoelectric conversion efficiency（PCE）due to the storage conditions at room temperature.The PCE of PSCs improved during the initial 72 h of prepared storage.The crystallinity of the perovskite film was tested by X-ray diffraction（XRD）,the fluorescence intensity of the film and the carrier lifetime of the material were tested by steady-state（PL）transient（TRPL）photoluminescence,and the conventional electrochemical test of perovskite The number,location and intensity of internal defects in the material,it is found that due to the increase in perovskite crystallinity,the non-radiative recombination of the film decreases by an order of magnitude,and finally the number,location and intensity of perovskite bulk phase defects are alleviated by passivation,PSCs The photoelectric performance of the device has taken a new step.These results suggest that it is the combined effect of so many factors that leads to the improved photovoltaic performance of perovskite solar cells after storage.