研究目的
To investigate the effect of Sr substitution on the humidity and thermal stability of perovskite solar cells (PSCs).
研究成果
The PSCs prepared with 10 mol% SrI2 or 10 mol% SrCl2 substitution exhibit an excellent stability under a dry air condition (20±5 (cid:1), ~5%RH). At higher humidity, 10 mol% SrCl2 substitution can improve the moisture resistance of perovskite film, which is beneficial to suppress the increase of perovskite’s defect density caused by humidity. Under the condition of “85(cid:1), 15±5%RH”, both the 10 mol% SrI2-substituted and 10 mol% SrCl2-substituted perovskite films show a good thermal stability.
研究不足
The test standards of the commercial solar cells’ stability are difficult to apply to the aging test of PSCs. The main reason is that perovskite materials degrade rapidly in water, heat, ultraviolet light and other environments, resulting in a decline in device efficiency.
1：Experimental Design and Method Selection
A two-step spin-coating method was used to synthesize 10 mol% SrI2 and 10 mol% SrCl2-substituted perovskite films, which were then utilized to construct mesoscopic perovskite solar cells (PSCs). The influences of Sr substitutions on the humidity and thermal stability of PSCs were systematically investigated.
2：Sample Selection and Data Sources
Perovskite films were prepared with 10 mol% SrI2 substitution and 10 mol% SrCl2 substitution. The morphology, crystal structure and absorption changes of different Sr-substituted perovskite films under humility and heat conditions were systematically investigated.
3：List of Experimental Equipment and Materials
Materials were purchased from China National Pharmaceutical Group Corporation. Equipment used includes a field emission scanning electron microscope (Supra 55, Zeiss Berlin), a powder X-ray diffractometer (Rigaku Dmax-2500, Rigaku, Japan), a UV-visible spectrophotometer (TU-1901, Beijing Persee), and an X-ray photoelectron spectrometer (AXIS Ultra DLD, Kratos Japan).
4：Experimental Procedures and Operational Workflow
The perovskite films were synthesized with a two-step spin-coating method in the ambient air (20±2 (cid:1), 20±5%RH). The J-V property and the electrochemical impedance spectroscopy (EIS) data of the PSCs were measured by an electrochemical workstation (CHI 660C, CH Instruments, Inc.).
5：Data Analysis Methods
The EIS data was fitted by ZSimpWin software. The change of Rrec is mainly caused by the change of defect density in the perovskite and at its interface. The change of RS is mainly attributed to the decay of perovskite layer.
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