Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
Stable and low-cost electron transport materials (ETMs) with fewer surface defects and proper energy level alignments with halide perovskite active layers are generally required for efficient perovskite solar cells (PSCs) with long-term durability. Here, two-dimensional Van der Waals mixed valence tin oxides Sn2O3 and Sn3O4 are applied as ETMs for planar PSCs. The synthesized Sn2O3 and Sn3O4 have dimension size from 5 to 20 nm and disperse well in water as stable colloids for months. Both Sn2O3 and Sn3O4 exhibit typical n-type semiconductor energy band structures and have suitable energy level alignments with halide perovskites. A steady-state PCE of 22.36% and 21.83% is obtained for Sn2O3-based and Sn3O4-based planar PSCs. Besides, the half cells without hole transport materials and back electrodes show good UV-stability with average PCE retaining of 99.0% and 95.7% for Sn2O3-based and Sn3O4-based devices after 1000 hours’ ultraviolet soaking with an intensity of 70 mW cm-2.
The authors acknowledge financial support from the National Natural Science Foundation of China (Grant No. 91733301, 51902117 and 21702069), the Fundamental Research Funds for the Central Universities, the Science and Technology Department of Hubei Province (No. 2017AAA190), the 111 Project (No. B07038) and the Program for HUST Academic Frontier Youth Team (2016QYTD06), the Fundamental Research Funds for the Central Universities (No. 2019kfyXJJS051). We thank the Analytical and Testing Center of Huazhong University of Science and Technology (HUST) for performing various characterization and measurements.
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