Description
Due to the limited understanding on the specific impact of air upon the formation of CH3NH3PbI3 perovskite crystal from solution phase, developing high-efficiency air-processed perovskite solar cells (PVSCs) is still challenging. Here, we demonstrate a systemic investigation to reveal the original limitations on developing air-processed PVSCs. We found that ambient air would generally lead to uncontinuous PbI2 and low-quality perovskite films. A detailed correlation between the PbI2 solution wetting capability on various substrates and their corresponding film deposition behavior in air has been established. This provides useful information for fabricating perovskite in air with solution deposition method. More importantly, we found that simply preheating the substrate and PbI2 precursor solution can effectively eliminate the detrimental effects of air during the PbI2 film deposition, with a possible work mechanism proposed. Benefiting from the effective elimination of detrimental effect originated from air, along with poly-TPD with well-matched work function as the hole transporting layer, highly efficient air-processed PVSCs, with a champion efficiency of 18.11%, have been achieved, which is the highest efficiency achieved by solution-processed PVSCs in air to date. Our work not only provides a practical strategy for highly efficient air-processed PVSCs, but also provides valuable insights into the thorough understanding of the limitations of fabricating PVSCs in air.| Period | 24 May 2017 |
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| Event title | Europe Materials Research Society 2017 Spring Meeting |
| Event type | Conference |
| Location | Strasbourg, FranceShow on map |
| Degree of Recognition | International |