期刊
ACS NANO
卷 11, 期 10, 页码 10214-10221出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b04762
关键词
CsPbBr3 QDs; perovskite solar cell; Kelvin probe force microscopy; surface potential; charge carrier dynamics; light illumination
类别
资金
- National Funds through FCT-Portuguese Foundation for Science and Technology [UID/CTM/50025/2013]
- FEDER funds through the COMPETE Programme [POCI-01-0145-FEDER-007688]
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie [661199]
- project BET-EU-Materials Synergy Integration for a better Europe [BI_86_16, GA 692373]
- Marie Curie Actions (MSCA) [661199] Funding Source: Marie Curie Actions (MSCA)
Highly luminescent CsPbBr3 perovskite quantum dots (QDs) have gained huge attention in research due to their various applications in optoelectronics, including as a light absorber in photovoltaic solar cells. To improve the performances of such devices, it requires a deeper knowledge on the charge transport dynamics inside the solar cell, which are related to its power-conversion efficiency. Here, we report the successful fabrication of an all-inorganic CsPbBr3 perovskite QD sensitized solar cell and the imaging of anomalous electrical potential distribution across the layers of the cell under different illuminations using Kelvin probe force microscopy. Carrier generation, separation, and transport capacity inside the cells are dependent on the light illumination. Large differences in surface potential between electron and hole transport layers with unbalanced carrier separation at the junction have been observed under white light (full solar spectrum) illumination. However, under monochromatic light (single wavelength of solar spectrum) illumination, poor charge transport occurred across the junction as a consequence of less difference in surface potential between the active layers. The outcome of this study provides a clear idea on the carrier dynamic processes inside the cells and corresponding surface potential across the layers under the illumination of different wavelengths of light to understand the functioning of the solar cells and ultimately for the improvement of their photovoltaic performances.
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