Title | Large grained and high charge carrier lifetime CH3NH3PbI3 thin-films: implications for perovskite solar cells |
Publication Type | Journal Article |
Year of Publication | 2017 |
Authors | Chouhan, ASingh, Jasti, NPrathibha, Hadke, S, Raghavan, S, Avasthi, S |
Journal | Current Applied Physics |
Volume | 17 |
Pagination | 1335–1340 |
Keywords | Large grains, Methylamine vapor annealing, Microwave detected carrier lifetime, Morphology, Perovskite, Solar cell |
Abstract | Spin coated perovskite thin films are known to have an issue of pinholes & poor morphology control which lead to poor device-to-device repeatability, that is an impediment to scale-up. In this work, Methylamine vapor annealing process is demonstrated which consistently leads to high-quality perovskite thin-films with an average grain-size of 10–15 μm. The improvement in film morphology enables improvement in effective carrier recombination lifetime, from 21 μs in as-deposited films to 54 μs in vapor-annealed films. The annealed films with large-grains are also more stable in ambient conditions. Devices made on annealed perovskite films are very consistent, with a standard deviation of only 0.7%. Methylamine vapor annealing process is a promising method of depositing large-grain CH3NH3PbI3 films with high recombination lifetime and the devices with improved performance. |
DOI | 10.1016/j.cap.2017.07.005 |