Nano Research & Applications

Low-temperature SnO2-modified TiO2 yields record efficiency for normal planar perovskite solar modules

Joint Event on 25^th Nano Congress for Future Advancements & 12^th Edition of International Conference on Nanopharmaceutics and Advanced Drug Delivery
August 16-18, 2018 | Dublin, Ireland

Guan-Jun Yang

Xi an Jiaotong University, China

Posters & Accepted Abstracts: Nano Res Appl

DOI: 10.21767/2471-9838-C3-015

Abstract

Hybrid organic-inorganic perovskite solar cells (PSCs), particularly for the planar PSCs, attracted significant attention because of their high efficiency, low fabrication costs, and simple preparation process. However, planar PSCs exhibit lower efficiency and stability than mesoporous PSCs, primarily owing to defects in the electron transport layer (ETL). Here, we introduce a SnO2 nanoparticle modified TiO2 film (SnO2@TiO2) as the ETL. In addition, we propose a simple three-step chemical bath method to achieve such SnO2@TiO2 structure at low temperatures (140°C). The SnO2@TiO2 ETL significantly enhances the electron extraction and decreases the trap states at the perovskite/ETL interface. We achieved average efficiencies at reverse scan and forward scan of 21.27%, 19.79%, 17.21% and 16.31% for device area of 0.10 cm2, 1.13 cm2, 5.25 cm2 and 10.56 cm2 respectively. Besides, we achieved a certificated efficiency of 15.65% for the normal planar perovskite solar module with masked area of 10.55 cm2. The SnO2@TiO2-based PSCs exhibit enhanced photocurrent and reduced hysteresis. Furthermore, the solar cell retained about 89% of its initial efficiency after about 750 hours of aging in dark and about 93% for 528 hours under full-sun illumination. Because of the low-temperature processability and the absence of spin-coating steps, SnO2@TiO2 ETLs will provide a promising path for the commercialization of PSCs.

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