期刊
ACS ENERGY LETTERS
卷 4, 期 12, 页码 3011-3017出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.9b02080
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资金
- Czech Ministry of Education, Youth and Sports [CZ. 02.1.01/0.0/0.0/15_003/0000464]
- Czech Science Foundation [17-26041Y]
- EU Horizon 2020 Marie Sklodowska-Curie Individual Fellowship under Grant POSITS [747221]
- European Regional Development Fund OPPK [CZ.2.16/3.1.00/21545]
- Marie Curie Actions (MSCA) [747221] Funding Source: Marie Curie Actions (MSCA)
Advanced characterization methods avoiding transient effects in combination with solar cell performance monitoring reveal details of reversible light-induced perovskite degradation under vacuum. A clear signature of related deep defects in at least the 1 ppm range is observed by low absorptance photocurrent spectroscopy. An efficiency drop, together with deep defects, appears after minutes-long blue illumination and disappears after 1 h or more in the dark. Systematic comparison of perovskite materials prepared by different methods indicates that this behavior is caused by the lead halide residual phase inherently present in material prepared by the two-step method. X-ray photoelectron spectroscopy confirms that lead halide when illuminated decomposes into metallic lead and mobile iodine, which diffuses into the perovskite phase, likely producing interstitial defects. Single-step preparation, as well as preventing lead halide illumination, eliminates this effect.
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