Journal
NANOMATERIALS
Volume 12, Issue 12, Pages -Publisher
MDPI
DOI: 10.3390/nano12122065
Keywords
low-bandgap perovskite; interface passivation; perovskite solar cells; self-powered photodetectors; visible light communication
Categories
Funding
- National Natural Science Foundation of China [61875143, 62005188, 62075146, 62120106001]
- Natural Science Foundation of Jiangsu Province [BK20190825]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [20KJA510003]
- Qinglan Project of Jiangsu Province of China
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
- Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province
- Key Lab of Modern Optical Technologies, and Engineering Research Center of Digital Imaging and Display, Education Ministry of China, Soochow University [KJS1909]
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The performance of low-bandgap perovskite solar cells and unbiased perovskite photodetectors can be improved by the synergistic effects of maltol and PCBM, which passivate defects and tune charge transfer dynamics.
Low-bandgap (E-g similar to 1.25 eV) mixed tin-lead (Sn-Pb) perovskites are promising candidates for efficient solar cells and self-powered photodetectors; however, they suffer from huge amounts of defects due to the unintentional p-type self-doping. In this work, the synergistic effects of maltol and phenyl-C61-butyric acid methyl ester (PCBM) were achieved to improve the performance of low-bandgap perovskite solar cells (PSCs) and unbiased perovskite photodetectors (PPDs) by passivating the defects and tuning charge transfer dynamics. Maltol eliminated the Sn-related traps in perovskite films through a strong metal chelating effect, whereas PCBM elevated the built-in electric potential and thus improved voltage through the spike energy alignment. Combining both advantages of maltol and PCBM, high-quality perovskite films were obtained, enabling low-bandgap PSCs with the best efficiency of 20.62%. Moreover, the optimized PSCs were further applied as self-powered PPDs in a visible light communication system with a response time of 0.736 mu s, presenting a satisfactory audio transmission capability.
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