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Room-Temperature Atomic-Layer-Deposited Al O Improves the Efficiency of Perovskite Solar Cells over Time. | LitMetric
Electrical characterisation of perovskite solar cells consisting of room-temperature atomic-layer-deposited aluminium oxide (RT-ALD-Al O ) film on top of a methyl ammonium lead triiodide (CH NH PbI ) absorber showed excellent stability of the power conversion efficiency (PCE) over a long time. Under the same environmental conditions (for 355 d), the average PCE of solar cells without the ALD layer decreased from 13.6 to 9.6 %, whereas that of solar cells containing 9 ALD cycles of depositing RT-ALD-Al O on top of CH NH PbI increased from 9.4 to 10.8 %. Spectromicroscopic investigations of the ALD/perovskite interface revealed that the maximum PCE with the ALD layer is obtained when the so-called perovskite cleaning process induced by ALD precursors is complete. The PCE enhancement over time is probably related to a self-healing process induced by the RT-ALD-Al O film. This work may provide a new direction for further improving the long-term stability and performance of perovskite solar cells.
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