Managing defects in SnO2 is critical for improving the power conversion efficiency (PCE) of halide perovskite-based solar cells. However, typically reported SnO2-based perovskite solar cells have inherent defects in the SnO2 layer, which lead to a lower PCE and hysteresis. Here, we report that a dual-coating approach for SnO2 with different annealing temperatures can simultaneously form a SnO2 layer with high crystallinity and uniform surface coverage. Along with these enhanced physical properties, the dual-coated SnO2 layer shows favorable band alignment with a mixed halide perovskite. After careful optimization of the dual-coating method, the average PCE of the perovskite solar cell based on the dual-coated SnO2 layer increases from 18.07 to 19.23% with a best-performing cell of 20.03%. Note that a facile two-step coating and annealing method can open new avenues to develop SnO2-based perovskite solar cells with stabilized and improved photovoltaic performances.
Bibliographical noteFunding Information:
We gratefully acknowledge support from the National Research Foundation of Korea (NRF) grant funded by the Korean government (2018M1A3A3A02065974, NRF-2012M3A6A7054861). This work was also partially supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant financial resources from the Ministry of Trade, Industry & Energy (MOTIE), Republic of Korea (20163010012450, 20173010013340).
Copyright © 2019 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Physical and Theoretical Chemistry